Supercapacitive performance of chemically synthesized polypyrrole thin films: effect of monomer to oxidant ratio

Polypyrrole (PPY) thin films with different PPY monomer to ammonium peroxidisulphate (APS) oxidant molar ratios have been synthesized using simple and inexpensive chemical oxidative polymerization method. An interrelation between the monomer to oxidant molar ratio, morphology and supercapacitive performance of PPY thin films is studied. Initial polymerization conditions strongly affect the morphology and electrical properties of PPY thin films. Thermo-gravimetric and differential scanning calorimetric curves show the thermal stability of PPY up to 483 K. The supercapacitive performance of PPY films is studied using cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques. In the present work, PPY films deposited with 0.1:0.2 monomer to oxidant molar ratio (pyrrole:APS) show maximum specific capacitance of 754 F g^?1 in 1 M H₂SO₄ electrolyte at the scan rate 5 mV s^?1 in potential window of ?0.4 to +0.6 V/SCE.     

Fabrication and mechanical properties of β-sialon–Fe x Si y –CNTs composites

Silicon nitride composites were fabricated by adding Fe₃Al and carbon nanotubes and hot-pressing at a low sintering temperature of 1600 °C. The resulted composites were characterized by X-ray diffraction, Fourier-transform infrared spectrum, and field emission scanning electron microscopy. It was found that the Fe₃Al could react with Si₃N₄ to form the series of compound of Fe _x Si _y , and CNTs could keep chemical stability in the system. Mechanical properties of the composites were also investigated. For Fe₃Al as the additive, the relative density could reach to 93.6 % with the maximum hardness of 15.7 GPa. When the Fe₃Al and CNTs were added into matrix simultaneously, the relative density reached to 92.6 %, and the maximum fracture toughness was 6.7 MPa m^1/2. Finally, the toughening mechanism of Fe₃Al and CNTs in sialon composites, containing crack deflection and bridging, and nanotubes pullout and bridging, were also discussed.     

Effects of ZnO nanoneedles addition on the mechanical and piezoelectric properties of hard PZT-based composites

Hard PZT (PZT4)-based composites embedded by ZnO nanoneedles (denoted as PZT/ZnO_n) were fabricated by a solid state sintering technique. The characteristic diffraction peaks of the perovskite PZT and ZnO phases were identified from the studied composites, indicating the retention of ZnO_n. With increasing ZnO_n content, the grain size of the composites was reduced gradually. In contrast with the pure PZT, the PZT/ZnO_n composites possessed more excellent mechanical properties, while the piezoelectric properties were reduced by a certain extent. The best mechanical properties of PZT/ZnO_n composites were obtained by sintering at 1,150 °C with 1.5 wt% ZnO nanoneedles addition: fracture toughness K _IC ~ 2.04 MPa m^1/2, flexural strength σ _f ~ 105.44 MPa, compressive strength σ _c ~ 543.89 MPa. The piezoelectric properties of the PZT/ZnO_n composites were found to be lower than that of the pure PZT with dielectric permittivity ε _r of 768–893, piezoelectric coefficient d ₃₃ of 240–260pC/N, mechanical quality factor Q _m of 340–650 and planar electromechanical coupling k _p of 0.5–0.55.     

Effect of nitrile-functionalization and thermal cross-linking on the dielectric and mechanical properties of PEN/CNTs–CN composites

In this study, a novel series of composite films consisting of nitrile-functionalized carbon nanotubes (CNTs–CN) and poly(arylene ether nitriles) (PEN) were successfully fabricated by the tape-casting method. The –CN groups in PEN chains and the phthalonitrile groups on CNTs–CN formed the thermally stable triazine rings by thermal cross-linking reaction in the presence of diamino diphenyl sulfone, which was characterized by Fourier transform infrared spectroscopy. The result indicated that the chemical cross-linking reaction occurred accompanied by the emergence of a new absorption peak at 1,361 cm^?1. Besides, the effect of cross-linking on the morphology, thermal stability, mechanical and dielectric properties of the PEN/CNTs–CN was investigated. The SEM images showed that the phase interface between surface modified CNTs and PEN matrix was indistinct, and the surface modified CNTs presented a better dispersion behavior in PEN matrix. The mechanical properties of the processed films were improved substantially compared with the unprocessed films. Furthermore, the glass-transition temperature (T _g ) of composite films processed at 320 °C for 4 h (about 245 °C) was higher than that of composite films before thermal treatment (about 205 °C). The 5 % weight loss temperature of the composite films (processed at 320 °C for 4 h) increased by about 110 °C compared with the composite films (unprocessed). More importantly, by thermal cross-linking, the dielectric constant (ε) of composite films with 8 wt% CNTs–CN loading was increased from 31.8 to 33.9, and dielectric loss (tan δ) was decreased from 0.90 to 0.61 at 1 kHz.     

Effect of Ba(Zn1/3Ta2/3)O3 and SiO2 ceramic fillers on the microwave dielectric properties of butyl rubber composites

Butyl rubber–Ba(Zn_1/3Ta_2/3)O₃ (BR–BZT) composites and butyl rubber–silica (BRS) composites were prepared by sigma mixing. The dielectric properties at 1 MHz and 5 GHz of BR–BZT and BRS composites were investigated as a function of ceramic loading and were found to be improved with filler loading. For a optimum BZT loading of 0.26 v_f, the BR–BZT composite have ε_r = 4.88, tanδ = 0.0022 (at 5 GHz), coefficient of thermal expansion (CTE) = 112 ppm/°C, thermal conductivity (TC) = 0.30 Wm^?1 K^?1 and water absorption = 0.047 vol%. The BRS composites attained ε_r = 2.79, tanδ = 0.0039 (at 5 GHz), CTE = 102 ppm/°C, TC = 0.40 Wm^?1 K^?1 and water absorption = 0.078 vol% for the same loading of silica. The stress–strain curves of both composites showed good flexibility of the composite. The measured relative permittivity and TC of both composites were compared with different theoretical approaches.     

Thermal stability and fire behavior of aluminum diethylphosphinate-epoxy resin nanocomposites

The flame retardancy of 2, 2-bis(4-glycidyloxyphenyl)propane (DGEBA)-aluminum diethylphosphinate (AlPi) nanocomposites (EP-AlPi/(P ? x), x = 1, 2, 3 %) was greatly enhanced by ultrasonic dispersion of nano-sized AlPi into epoxy resin. The UL 94 V-0 rating can be reached for EP-AlPi nanocomposites with a relatively low addition amount of AlPi (on the account of 8.4 wt% or phosphorus content of 2 wt%) as well as the LOI value over 37.2. The glass transition temperature (T _g) enhanced properties were investigated by DTA, which showed that: T _gs were about 5 °C higher than that of neat epoxy resin; T _g increased along with content increasing of AlPi. Based on TGA results under a non-isothermal condition, the thermal degradation kinetics of EP-AlPi/(P ? x) composites were studied by Kissinger’s, Ozawa’s, Flynn–Wall–Ozawa’s and Coast-Redfern’s methods, which suggested the conversion function f (α) = 1/2α ^?1 or f (α) = [?ln(1 ? α)]^?1 for EP-AlPi/(P ? 1 %); f (α) = [?ln(1 ? α)]^?1 for EP-AlPi/(P ? 2 %) and EP-AlPi/(P ? 3 %) during the investigated process. The epoxy resin nanocomposites obtained in this study are green functional polymers and will become flame retardant potential candidates in electronic fields such as printed wiring boards with high performance.     

Microwave absorption characteristics of CH<Subscript>3</Subscript>NH<Subscript>3</Subscript>PbI<Subscript>3</Subscript> perovskite/carbon nanotube composites

The CH₃NH₃PbI₃ (MAPbI₃) and CH₃NH₃PbI₃/carbon nanotube (MC) composite have been successfully synthesized by a facile in situ solution method, which are investigated as the microwave absorption materials. For the MAPbI₃ particles, the minimum reflection loss is only ?4.9 dB around 16.4 GHz due to the poor relative complex permittivity. Then, the relative complex permittivity of MC composites could be adjusted by changing the mass fraction of CNTs in composite, which is a vital role for the dielectric loss. The reflection loss of MC-5 composite (MAPbI₃/CNT, 5:1 wt%) can be improved to ?35.7 dB with thickness of 1.3 mm at 13.1 GHz. When the thickness is <3.0 mm, the microwave absorption bandwidth of MC-5 is 11.8 GHz (5.0–16.8 GHz) under the reflection loss lower than ?20 dB. The quarter-wavelength (λ/4) matching model is used to discuss the microwave absorption mechanism of MC composites. These results indicate that MC-5 composite could be used as the microwave absorption materials with strong reflection loss, lightweight and broad bandwidth.     

Phase composition and microwave dielectric properties of Mg-excess MgTiO3 ceramics

The phase composition and microwave dielectric properties of Mg-excess MgTiO₃ (Mg/Ti = 1, 1.02, 1.04, 1.05, 1.07) ceramics prepared via the conventional solid-state reaction route were investigated. A slight deviation from stoichiometry does not practically affect the relative permittivity and temperature coefficient of resonant frequency of the specimen. However, the Q _f value is very sensitive to the composition and it shows a non-linear variation corresponding to a relative amount of Mg. A very high Q _f can be achieved for specimen with single MgTiO₃ phase, which can be obtained within the suitable composition. As the increasing of Mg content, the MgTi₂O₅ phase which was derived from Mg/Ti = 1 was disappeared, and when it exceeded 1.02, the phase of Mg₂TiO₄ emerged. Along with the augmentation of Mg/Ti, the bulk density and Q _f showed an initial increase, followed by a decrease, but ε_r had been declining. The specimen with single MgTiO₃ phase was obtained at the level of Mg/Ti = 1.02. A high Q _f of 357,400 GHz (at 10 GHz) together with an ε_r = 17 and τ _f  = ?51 ppm/°C for MgTiO₃ ceramics (Mg/Ti = 1.02) were obtained at 1,390 °C sintered for 4 h.     

Effect of TiO2 and Al2O3 doping on sintering behavior and microwave dielectric properties of Ba4(Sm0.5Nd0.5)28/3Ti18+xO54+2x ceramics

The effects of TiO₂ and Al₂O₃ doping on the phase formation, the microstructure and microwave dielectric properties of Ba_6?3x (Sm_1?y ,Nd _y )_8+2x Ti₁₈O₅₄ (x = 2/3 and y = 0.5; BSNT) ceramics were investigated. X-ray diffraction patterns showed that the main crystal phase of BSNT + xTiO₂ (x = 0–2) ceramics sintered at 1,280 and 1,300 °C for 5 h was Ba(Sm, Nd)₂Ti₄O₁₂, accompanied by a small number of second phases: Ba₂Ti₉O₂₀ and TiO₂ (x ≥ 1.0), while the new phase BaAl₂Ti₅O₁₄ appeared and the two phases Ba₂Ti₉O₂₀ and TiO₂ disappeared in BSNT ? 2TiO₂ ceramic doped with ≥2 wt% Al₂O₃ successively as identified by scanning electron microscopy and energy dispersive spectroscopy analysis. The TiO₂ and Al₂O₃ working as sintering aids conduced effectively to promote the densification and grain growth, and thus decreasing the sintering temperature, so when the amounts of TiO₂ was increased, Q × f and τ _f values increased continuously. The BSNT ? 2TiO₂ ceramics doped with y wt% Al₂O₃ decreased the density and dielectric constant, increased the Q × f value remarkably and the τ _f values was adjusted from 25.3 to ?7.3 ppm/ °C. When doped with 1.5 wt% Al₂O₃ sintered at 1,260 °C for 5 h, the ceramics obtained the excellent microwave dielectric properties: ε _r  = 74.3, Q × f = 11,928 GHz, and τ _f  = +5.39 ppm/ °C.     

Preparation and characterization of K-substituted NaCa4Nb5O17 microwave dielectric ceramics

The effect of K substitution for Na on the phase, microstructure and microwave dielectric properties of the Na_1?x K _x Ca₄Nb₅O₁₇ (x = 0–1) composition series was investigated. The compositions with x = 0, 0.5 and 1 formed single-phase Na_1?x K _x Ca₄Nb₅O₁₇ ceramics within the detection limit of the in-house XRD facility when sintered at 1,200–1,300 °C. At x = 0.25 and 0.75, the major Na_1?x K _x Ca₄Nb₅O₁₇ phase formed but along with a secondary CaNb₂O₆ phase. Relative permittivity (ε _r ) and temperature coefficient of resonant frequency (τ_f) increased from 45 to 51 and ?120 to +473 ppm/ °C respectively while the quality factor (Q × f _o ) decreased from 13,838 to 2,374 GHz with an increase in x from 0 to 1. Optimum microwave dielectric properties (i.e. ε _r  = 47, Q × f _o  = 5,047 GHz and τ_f = ? 23 ppm/ °C) were achieved for the x = 0.5 (i.e. Na_0.5K_0.5Ca₄Nb₅O₁₇) composition. Further investigations are required to improve the density and hence microwave dielectric properties of Na_1?x K _x Ca₄Nb₅O₁₇ ceramics.     

Phase stability, low temperature cofiring and microwave dielectric properties of BaTi5O11 ceramics with BaCu(B2O5) addition

The effects of BaCu(B₂O₅) (BCB) additions on the sintering temperature, microstructure and microwave dielectric properties of BaTi₅O₁₁ modified with 1.0 wt% CuO (BTC) ceramic have been investigated using X-ray diffraction, scanning electron microscopy and dielectric measurement. The BTC ceramic shows a high sintering temperature (~1,100 °C) and good microwave dielectric properties as Q × f = 44,530 GHz, ε _r = 40.5, τ _f  = 39 ppm/°C. The addition of BCB to BTC effectively reduced the sintering temperature from 1,100 to 925 °C. The reduced sintering temperature was attributed to the BCB liquid phase. The BTC ceramic doped with 4 wt% BCB has a good microwave dielectric properties with Q × f = 25,502 GHz, ε _r = 37.4, τ _f  = 33.1 ppm/°C. The chemical compatibility of silver electrodes and low-fired samples has also been investigated.     

Solution-processed Ni–CNTs filled ferroelectric P(VDF–TrFE) composites with improved dielectric properties and thermal conductivity

Dielectric composites made using two kinds of poly(vinylidene fluoride–trifluoroethylene) [P(VDF–TrFE)] (70/30 and 80/20 mol%) as polymer matrices and nickel particles coated carbon nanotubes (Ni–CNTs) as filler were developed via solution-processed method. The scanning electron microscopy (SEM) indicated good compatibility and dispersion of Ni–CNTs in the P(VDF–TrFE) matrix. Ni–CNTs/P(VDF–TrFE) composites exhibited high dielectric constants with low dielectric losses. The maximum dielectric constants of Ni–CNTs/P(VDF–TrFE) composites of 198 and 185 at 100 Hz were obtained at 18.0 wt% Ni–CNTs loading, respectively. The incorporation of Ni–CNTs in the P(VDF–TrFE) matrix resulted in enhanced thermal conductivity. The highest values, obtained at 18.0 wt% Ni–CNTs loading, were 1.05 and 1.03 W/m K, respectively. Although there were no very obvious difference, the dielectric properties and thermal conductivity of Ni–CNTs/P(VDF–TrFE) 70/30 mol% composites were slightly better to those of Ni–CNTs/P(VDF–TrFE) 80/20 mol% composites in many cases. The aforementioned results suggest that these high-performance composites hold great promise for application in electrical and electronic field.     

Low-temperature sintered Mg2SiO4–CaTiO3 ceramics with near-zero temperature coefficient of resonant frequency

The microwave dielectric properties and the microstructures of (1 ? x)Mg₂SiO₄–xCaTiO₃ composite ceramics with Bi₂O₃–Li₂CO₃–H₃BO₃ (BLB) additions prepared by solid-state reaction method have been investigated. The crystalline phases were studied systematically by using the X-ray diffraction, microstructures by the scanning electron microscopy and composition analysis by the energy-dispersive spectroscopy. The results showed that the τ _f of (1 ? x)Mg₂SiO₄–xCaTiO₃ was related to the amount of CaTiO₃ phase constitutions. When x = 0.08 and 0.09, the τ _f of (1 ? x)Mg₂SiO₄–xCaTiO₃ were about ?3.0 ppm/°C and +6.8 ppm/°C. The microwave dielectric properties of 0.91Mg₂SiO₄–0.09CaTiO₃ ceramics samples with BLB additions sintered at 900–1,000 °C were characterized, and the permittivity and Q × f were associated with the amount of BLB and the sintering temperature. The sintering temperature of ceramics was reduced to 950 °C from about 1,250 °C and the temperature coefficient of resonant frequency (τ _f ) was modified to ?5.0 ppm/ °C with good Q × f. The addition of 12.0 wt% Bi₂O₃–Li₂CO₃–H₃BO₃ in 0.91Mg₂SiO₄–0.09CaTiO₃ ceramics sintered at 950 °C showed excellent dielectric properties of ε _r  = 7.7, Q × f = 11,300 GHz (f = 6.1 GHz) and τ _f  = ?5.0 ppm/ °C. This represented a very promising candidate material for LTCC applications.     

Effect of sintering parameters on the microstructure and microwave dielectric properties of Ba(Zn1/3Nb2/3)O3–ZnNb2O6 Ceramics

Ba(Zn_1/3Nb_2/3)O₃–ZnNb₂O₆(BZNZ) composite ceramics were fabricated by conventional solid solution processing. After optimizing the composition, the effects of the sintering parameters, such as the heating rate, the soaking time, and the cooling rate on densities, microstructure, and microwave dielectric properties were investigated using orthogonal experimental design method. The results show that with increasing the content of Ba(Zn_1/3Nb_2/3)O₃, the ε _r increases, while the Q × f value increases first, then decreases, and τ _f shifts to the negative value. The BZNZ ceramics with composition of 0.3Ba(Zn_1/3Nb_2/3)O₃–0.7ZnNb₂O₆ show the optimal dielectric properties. The results of orthogonal experimental design show that sintering parameters play an important role in the microstructure and dielectric properties. The ceramics show obvious duplex-grain structure. The importance sequence of the sintering parameters is: cooling rate > heating rate > soaking time. The sintering parameters were optimized, with 0.3Ba(Zn_1/3Nb_2/3)O₃–0.7ZnNb₂O₆ ceramic sintered at a heating rate of 2 °C/min, soaking time of 8 h, and cooling in the air. Samples have the excellent dielectric properties: ε_r = 32.75, Q × f = 34,100, and τ _f  = ?10.2 ppm/°C.     

Effect of borosilicate glasses on the microwave dielectric properties of ZnO–Nb2O5–Ta2O5 system

(1 ? y)[0.5ZnNb₂O₆–0.5Zn₃Nb₂O₈]–yZnTa₂O₆ with y = 0.91 (ZNT) ceramic have been prepared by conventional solid state ceramic route. The effect of glass additives on the microstructure, densification, and microwave dielectric properties of the ZNT ceramic for low temperature co-fired ceramic applications was investigated. Different weight percentages of quenched glass such as ZnO–B₂O₃–SiO₂, BaO–B₂O₃–SiO₂, LiO–B₂O₃–SiO₂ and MgO–B₂O₃–SiO₂ were added to ZNT powder. The crystal structure of the ceramic–glass composites was studied by X-ray diffraction and microstructure by scanning electron microscopy. The microwave dielectric properties such as relative permittivity (ε_r), quality factor (Q_uxf) and co-efficient of temperature variation of resonant frequency (τ_f) of the ceramics have been measured in the frequency range 4–6 GHz. The 5 wt% ZnO–B₂O₃–SiO₂ added ZNT ceramic sintered at 900 °C showed: ε_r = 28.1, Q_uxf = 32820 GHz (at 4.92 GHz), and τ_f = ?7.7 ppm/^oC respectively.     

Microwave dielectric properties of a new A6B5O18-type cation deficient perovskites: Sr5LaTi2Nb3O18

A new A₆B₅O₁₈-type cation deficient perovskite Sr₅LaTi₂Nb₃O₁₈ was prepared by the conventional solid-state reaction route. The phase, microstructure, and microwave dielectric properties of the ceramic were characterized. This compound crystallizes in the trigonal system with unit cell parameter a = 5.6101(2) Å, c = 40.922(8) Å, V = 1,115.4(5) Å³, and Z = 3. It shows a high dielectric constant of 48, a high quality factors with Q _u × f of 27,806 GHz, and a small positive τ _f of +19 ppm/°C.     

Glass-free LTCC microwave ceramic-Ca1−x(La0.5Na0.5)xWO4

The structure and microstructure of the Ca_1?x(La_0.5Na_0.5)_xWO₄ (0.1 ≤ x ≤ 1.0) ceramics were investigated using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) method. The microwave dielectric properties of the ceramics were studied with a network analyzer at the frequency of about 10–14 GHz. Continuous solid solutions Ca_1?x(La_0.5Na_0.5)_xWO₄ (0.1 ≤ x ≤ 1.0) with Scheelite structure (space group: I4₁/a) could be densified at 850 °C/2 h. The dielectric permittivity increased slightly with the increase in substitution amount. The Q × f value decreased with the increase of x up to x = 0.5, and then increased with further increase of x. The Q × f value increased when the sintering temperature increased from 850 to 950 °C for the x < 0.5 compositions, whereas it decreased with the increase in sintering temperature for the x > 0.5 compositions. The τ _f value changed a little with the variation of x. All samples exhibited negative τ _f values. Addition of 30 mol% TiO₂ to the x = 0.9 composition improved the τ _f to ?9.3 ppm/°C with ε_r = 14.4 and Q × f = 14,255 GHz after sintering at 850 °C/2 h. The chemical compatibility of Ca_0.1(La_0.5Na_0.5)_0.9WO₄ + 30 mol% TiO₂ composite with silver (Ag) powders was also investigated. The composite showed inert behavior with Ag when cofired at 875 °C for 2 h. However small amount of Na_0.86WO₃ impurity phase was detected in the co-fired specimen.     

Microwave dielectric properties of ZnO–Nb<Subscript>2</Subscript>O<Subscript>5</Subscript>–<Emphasis Type="Italic">x</Emphasis>TiO<Subscript>2</Subscript> ceramics prepared by reaction-sintering process

The ZnO–Nb₂O₅–xTiO₂ (1 ≤ x ≤ 2) ceramics were fabricated by reaction-sintering process, and the effects of TiO₂ content and sintering temperature on the crystal structure and microwave dielectric properties of the ceramics were investigated. The XRD patterns of the ceramics showed that ZnTiNb₂O₈ single phase was formed as x ≤ 1.6 and second phase Zn_0.17Nb_0.33Ti_0.5O₂ appeared at x ≥ 1.8. With the increase of TiO₂ content and sintering temperature, the amount of the second phase Zn_0.17Nb_0.33Ti_0.5O₂ increased, resulting in the increase of dielectric constant, decrease of Q × f value, and the temperature coefficient of resonant frequency (τ _f ) shifted to a positive value. The optimum microwave dielectric properties were obtained for ZnO–Nb₂O₅–2TiO₂ ceramics sintered at 1075 °C for 5 h: ε _r  = 45.3, Q × f = 23,500 GHz, τ _f  = +4.5 ppm/°C.     

Designed fabrication of hierarchical porous carbon nanotubes/graphene/carbon nanofibers composites with enhanced capacitive desalination properties

Carbonaceous materials, one of the most important electrode materials for sea water desalination, have attracted tremendous attention. Herein, we develop a facile and effective two-step strategy to fabricate hierarchical porous carbon nanotubes/graphene/carbon nanofibers (CNTs/G/CNFs) composites for capacitive desalination application. Graphite oxide (GO), Ni²⁺, and Co²⁺ are introduced into polyacrylonitrile (PAN) nanofibers by electrospinning method. During the annealing process, the PAN nanofibers are carbonized into CNFs felt, while the CNTs grow in situ on the surface of CNFs and graphite oxide are reduced into graphene simultaneously. Benefiting from the unique hierarchical porous structure, the as-prepared CNTs/G/CNFs composites have a large specific surface area of 223.9 m² g^?1 and excellent electrical conductivity. The maximum salt capacity of the composites can reach to 36.0 mg g^?1, and the adsorbing capability maintains a large retention of 96.9% after five cycles. Moreover, the effective deionization time of the CNTs/G/CNFs composites lasts more than 30 min, much better than the commercial carbon fibers (C-CFs) and graphene/carbon nanofibers (G/CNFs) composites. Results suggest that the designed hierarchical porous CNTs/G/CNFs architecture could enhance the capacitive desalination properties of electrode materials. And the possible adsorption mechanism of the novel electrode materials is proposed as well.     

Low temperature sintering of Li2(Mg0.3Zn0.7)Ti3O8-0.12TiO2 microwave dielectric ceramics with controllable grain size

The effects of BaO-B₂O₃-SiO₂ (BBS) frit on sinterability, microstructure and microwave dielectric properties of Li₂(Mg_0.3Zn_0.7)Ti₃O₈-0.12TiO₂ (LMZT) ceramics were systematically investigated. BBS frit can effectively lower the sintering temperature of LMZT ceramics to below 900 °C. Suitable BBS frit addition can accelerate the growth of the LMZT grains while inhibit the abnormal grain growth at the same time. The LMZT ceramics with 2 wt% BBS frit sintered at 900 °C for 3 h show homogeneous microstructure composed of 5–10 μm grains and excellent dielectric properties: ε _r  = 24.1, Q × f = 21,980 GHz, τ _f  = ?4.1 ppm/ °C. It is compatible with Ag electrodes, which makes it a potential candidate material for low temperature co-fired ceramics technology application.