不同方式引入CuO制备低温烧结(Bi1.5Zn0.5)(Zn0.5Nb1.5)O7陶瓷

以Bi₂O₃、ZnO和Nb₂O₅为原料,采用传统固相反应法制备（Bi_1.5Zn_0.5）（Zn_0.5Nb_1.5）O₇（BZN）陶瓷。通过CuO包覆层修饰BZN粉体表面,引入CuO助烧剂代替直接混合BZN和CuO粉体。以CuSO₄溶液为先驱体制备CuO包覆层,采用液相包覆法引入助烧剂可减少CuO的添加量,从而降低CuO对BZN陶瓷介电性能的不良影响。结果表明,当CuSO₄溶液浓度为0.5 mol/L时,可以促进陶瓷的烧结和致密化过程,经900℃烧结3 h所得BZN陶瓷介电性能最佳,介电常数（ε_r）为141,品质因数值（Q_f）为426 GHz,谐振频率温度系数（τ_f）为—357×10-6/℃（4 GHz）,皆优于固相混合法所得介电性能（介电常数为134,品质因数为287 GHz,谐振频率温度系数为—374×10-6/℃（4 GHz））。     

Investigation on pumping oxygen characteristics of （Bi2O3）0.73（Y2O3）0.27 solid electrolyte

（Bi2O3）0.73（Y2O3）0.27 fine powders prepared by wet chemical precipitation method were cold isostatically pressed to form solid electrolyte tubes, and sintered at 900 ℃ for 10 h in the air. Their pumping oxygen characteristics in non-dehydrated Ar gas were investigated, where a ZrO2 （Y2O3 stabilized） oxygen sensor was used to measure the oxygen partial pressure Po2. The results showed that the Po2 value reached magnitudes of 1×10^-2-1×10^-10 Pa at the applied pumping oxygen voltage of 0.5 V, 1×10^-37-1×10^-27 Pa at 1.0 V and 1×10^-53-1×10^47 Pa at 2.0 V within the temperature range from 550 to 650 ℃. Moreover, no cracks were found in the tested solid electrolyte tubes. Thus, the Bi2O3-Y2O3 system might be used in solid electrolyte oxygen pump for purifying gases.     

Crystallographic and electrochemical characteristics of La0.7Mg0.3Ni5.5? x (Al0.5Mo0.5) x ( x =0 to 0.8) hydrogen storage alloys

The structure, hydrogen storage property, and electrochemical characteristics of the La_0.7Mg_0.3Ni_5.5−x (Al_0.5Mo_0.5) _x (x=0, 0.2, 0.4, 0.6, 0.8) hydrogen storage alloys have been investigated systematically. It has been found by X-ray powder diffraction and Rietveld analysis that the alloys are multiphase and consist of impurity Ni phase and two main crystallographic phases, namely, the La(La, Mg)₂Ni₉ phase and the LaNi₅ phase, and the lattice parameters and the cell volumes of both the La(La, Mg)₂Ni₉ phase and the LaNi₅ phase increase with increasing Al and Mo content in the alloys. The P-C isotherm curves indicated that the hydrogen storage capacity of the alloy first increases and then decreases with increasing x, and the equilibrium pressure decreases with increasing x. The electrochemical measurements show that the maximum discharge capacity first increases from 298.5 (x=0) to 328.3 mAh/g (x=0.6) and then decreases to 304.7 mAh/g (x=0.8). The high rate dischargeability (HRD) of the alloy electrodes increases lineally from 65.4 pct (x=0) to 86.6 pct (x=0.8) at the discharge current density of 1200 mA/g. Moreover, the exchange current density of the alloy electrodes also increases monotonously with increasing x by the linear polarization curves. The hydrogen diffusion coefficient in the alloy bulk, D, increases with increasing Al and Mo content and thus enhances the low-temperature dischargeability (LTD) of the alloy electrodes.     

Removal of Cooking Fume by Catalytic Combustion on Pt/La-Al2O3 ＋ Ce0.5 Zr0.5O2 Catalyst

Four monolithic catalysts with low concentration of noble metal were prepared by the immersion method [ Pt/La- Al2O3, Pt/La-Al2O3 ＋ Pt/OSM （2 ： 1 ）, Pt/La-Al2O3 ＋ Pt/OSM （ 1 ： 1 ） Pt/La-Al2O3 ＋ Pt/OSM （ 1 ： 2） ], and measurements of their activity were carded out in a conventional fixed-bed flow reactor. The results show that the oxygen storage material （OSM） that is added can promote the activity of the prepared catalysts and can decrease the complete conversion temperature of cooking fume. When the ratio between La-Al2O3 and OSM is 1 ： 1, the catalyst has the highest activity, and the complete conversion temperature of cooking fume is 270℃ ; the catalyst thus prepared can be applied in a wide range of gas hourly space velocity （GHSV） [from 10000 to 60000 h^-1]. The catalyst obtained shows great potential for practical application.     

Preparation and Electrorheological Property of Y4O（OH）9（NO3）-NH4NO3 Materials

The new electrorheological (ER) material, a particle material composed of Y4O(OH)9(NO3) and NH4NO3, was obtained.They display better ER performance.The shear stress of the suspension of Y4O(OH)9(NO3)(NH4NO3)2.8 material in dimethyl silicone oil reaches 1469 Pa at an electric field strength (E) of 4.2 kV·mm-1 and the shear rate (γ) of 150 s-1.The relative shear stress, τE/τ0 (τE and τ0 are the shear stresses at E=4.2 and 0 kV·mm-1, respectively), is up to 29, which is 19 times that of pure Y2O3 material.The dielectric and conductive property of the materials play important roles in the modification of the ER effect of the particle materials.The researches on these new ER materials are very useful for obtaining a better understanding on the mechanism of the ER effect and finding an ideal ER material.     

Effect of Metal Oxide Doping into Ce0.5Zr0.5O2 on Catalytic Activity of MnOx/γ-Al2O3/Ce0.45Zro.45M0.1Ox （M = Y, La, Mn） Honeycomb Catalysts

This article showed that the catalytic activity of MnOx/γ-Al2O3/Ce0.5Zr0.5O2 monolithic catalyst toward the catalytic combustion of ethanol in a fixed bed reactor could be greatly improved by doping three metal oxides into Ce0.5Zr0.5O2. The catalytic activity of MnOx/γ-Al2O3/Ce0.45Zr0.45M0.1 Ox （M = Y, La, Mn） is better than that of MnOx/γ-Al2O3/Ce0.5 Zr0.5O2. The order of activity of the catalysts is as follows： MnOx/γ-Al2O3/Ce0.45Zr0.45Y0.1Ox 〉 MnOc/γ-Al2O3/Ce0.45 Zr0.45La0.1Ox 〉 MnOx/γT-Al2O3/Ce0.45Zr0.45Mn0.1Ox 〉 MnOx/y-Al2O3/Ce0.5Zr0.5O2. The influence of the loading amount of manganese oxide in enhancing the catalytic activity of MnOx/γ-Al2O3/Ce0.45Zr0.45Y0.1 Ox was investigated. The results showed that when MnO2 loading amount was 10% （mass fraction）, the MnOx/Al2O3/Ce0.45Zr0.45Y0.1Ox catalyst recorded the highest activity.     

Carbothermic reduction of llmenite (FeTiO3) and rutile (TiO2)

The mechanically activated carbothermic reduction mechanism of ilmenite has been examined by a combination of steady-state and dynamic thermal techniques coupled with X-ray diffraction. The reaction was found to proceed via an initial, rapid reduction to elemental iron and rutile, which was followed by a slow reduction of rutile to a series of oxides of the general formula Ti _n O_2n−1 until Ti₃O₅ was formed, which was found to be relatively stable. Iron was probably incorporated into the Ti _n O_2n−1 lattice only for n>3, forming mixed oxides of uncertain composition. The formation of TiC was evident at temperatures as low as 1100 °C, but the rate of reaction was extremely slow, presumably due to a solid-state diffusion limitation. Increasing the temperature gave increasing conversion of TiO₂ to TiC until it was the only confirmed product. The effect of iron on the later stages of reduction was removed by examining the reduction of pure rutile. It was found that the reduction of Ti₃O₅ was enhanced by the presence of iron. The separation of iron from the titanium product proved to be high, with > 90 pct of iron removed after the initial reduction. The iron removal increased slowly to almost 100 pct when elemental iron and titanium carbide were the products.     

Luminescence properties of YAl3（BO3）4 phosphors doped with Eu^3＋ ions

YAl3 （BO3）4： Eu^3＋ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction （XRD） and scanning electron microscope （SEM）. Doping YAl3（BO3）4： Eu^3＋ phosphors with concentration of Eu^3＋ ions of 0, 2, 5, 8 and 10 mol% were studied and their luminescent properties at room temperature were discussed. The excitation spectrum of Y0.95Eu0.05Al3（BO3）4 was composed of a broad band centered at about 252 nm and a group of lines in the longer wavelength region. In the emission spectra, the peak wavelength was about 614 nm under a 252 nm UV excitation. The optimal doping concentration of Eu^3＋ ions in YAl3（BO3）4： Eu^3＋ phosphors was 8 mol%.     

Luminescent characteristics of Ba3Y2（BO3）4：Eu^3＋ phosphor for white LED

The Ba3Y2（BO3）4：Eu^3＋ phosphor was synthesized using a high temperature solid-state reaction method and the luminescent characteristics were investigated. The emission spectrum exhibited one strong red emission at 613 nm, corresponding to the electric dipole 5D0-TF2 transition of Eu^3＋, under 365 nm excitation. The excitation spectrum of 613 nm indicated that the Ba3Y2（BO3）n：Eu^3＋ phosphor was effectively excited by ultraviolet （UV） （254, 365 and 400 nm） and blue （470 nm） light. The effect of Eu^3＋ concentration on the 613 nm emission of the Ba3Y2（BO3）n：Eu^3＋ phosphor was measured. The results showed that the emission intensity increased with increasing Eu^3＋ concentration, and then decreased. The CIE color coordinates of Ba3Y2（BO3）4：Eu^3＋ phosphor were x=0.641 and y=0.359 at 15 mol.% Eu^3＋.     

Thermochemical Study on Ternary Solid Complex of La(Gly)2 (Ala)3 Cl3 ·2H2O (s)

The complex of lanthanum chloride with Glycine and Alanine, La(Gly)₂(Ala)₃Cl₃ · 2H₂O, was synthesized and characterized by IR, elementary analysis, thermogravimetric analysis, and chemical analysis. The dissolution enthalpies of LaCl₃ · 7H₂O(s), 2Gly(s) + 3Ala(s) and La(Gly)₂(Ala)₃Cl₃ · 2H₂O(s) were determined in 2 mol · L⁻¹ HCl by a solution-reaction isoperibol calorimeter. By designing a thermochemical cycle in terms of Hess' Law and through calculation, the reaction enthalpy of lanthanum chloride seven-hydrate with Glycine and Alanine was obtained: Δ_rH^θ_m(298.15 K) = (29.652 ± 0.504) kJ · mol⁻¹, and the standard enthalpy of formation of La(Gly)₂(Ala)₃Cl₃ · 2H₂O(s) Δ_fH^θ_m[La(Gly)₂ (Ala)₃Cl₃ · 2H₂O, s, 298.15 K] = −4467.6 ± 8.3 kJ · mol⁻¹.     

Effect of metal doping into Ce0.5Zr0.5O2 on catalytic activity of MnOx/Ce0.5–xZr0.5–xM0.2xOy/Al2O3 for benzene combustion

The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction （XRD）, surface area analysis, oxygen storage capacity （OSC）, and H2-temperature programmed reduction （H2-TPR）. Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application.     

钠源对正极材料Na3V2（PO4）3性能的影响

采用溶胶凝胶-高温固相法,用不同的钠源制备NASICON结构钠离子电池正极材料Na₃V₂（PO₄）₃.借助扫描电子显微镜（SEM）,X射线衍射分析（XRD）,电池测试系统及电化学工作站对制备的Na₃V₂（PO₄）₃结构,形貌,电性能和内阻进行表征.研究结果表明,以Na₂CO₃为钠源合成Na₃V₂（PO₄）₃有更好的颗粒尺寸,形貌结构完整,充放电性能及循环稳定性更好,阻抗也较小;在2.5~4.0 V电压范围内,以0.2 C进行充放电,首次放电比容量达到110.8 mAh/g,50次循环后容量保持率为85.1 %.      

The nature of the FeAl3 liquid-(FeMn)Al6

Crystallization studies using an invertedL pattern of liquid aluminum alloys of compositions just to the right of the ternary point, and the application of a theoretical analysis of the behavior of a hypothetical system, show that the FeAl₃-(FeMn)Al₆-liquid reaction is peritectic close to the ternary point, and that the invariant reaction is eutectic,i.e., L = FeAl₃ + (FeMn)Al₆ + Al_(C). Formerly Senior Principal Research Scientist, CSIRO, is deceased. Formerly Senior Experimental Scientist, CSIRO, is retired.     

Collapse of charge ordering in Bi0.5Sr0.5MnO3 by cation disorder： a magnetic and structural investigation

The structure, transport, and magnetic properties of LaxBi0.5.xSr0.5MnO3 （LBSMO） （x=0.1 and 0.4） were studied through X-ray diffraction, magnetization, and electron spin resonance （ESR） measurements. The structural analysis showed that the LBSMO crystallized in an orthorhombic perovskite structure with Pbnm space group for x=-0.1 and Imma space group for x=0.4 and the highly polarizable 6s^2 lone pair of Bi^3＋ was the ttming factor for the structural variations. Magnetic studies revealed that the replacement of Bi ions by La ions resulted in the collapse high temperature charge ordering state of BSMO and it order Ferro Magnetically （FM） with Tc around 355 and 330 K for x=0.1 and 0.4, respectively. Both ESR, temperature and field dependant magnetization suggested that there was a coexistence of FM and the paramagnetic phases well below Tc and the FM and CO-AFM phases below 250 K of LBSMO.     

新型电荷转移配合物(C9H8N)10(NH4)3[Y(SiMo11O39)2]·20H2O的合成与表征

由三元杂多化合物(NH4)13[Y(SiMo11O39)2]·36H2O与喹啉反应合成了电荷转移化合物(C9H8N)10(NH4)3[Y(SiMo11O39)2]*20H2O.采用元素分析、X射线粉末衍射、红外光谱、固体漫反射电子光谱进行了表征.结果表明喹啉通过N原子结合质子形成阳离子与稀土杂多阴离子成盐,固体化合物中阴离子和阳离子之间存在较强的相互作用;化合物在光激发下发生分子内电荷转移,导致有机C9H8N+大阳离子的氧化和稀土杂多阴离子的还原,标题化合物颜色由黄转变为深蓝色.     

Preparation of La（OH）3 and La2O3 with Rod Morphology by Simple Hydration of La2O3

Lanthanum hydroxide with rod-like morphology was synthesized with simple hydration processing via the hydration of its bulk oxide in normal water solution at boiling temperature. An XRD pattern shows the formation of the hexagonal phase of La（OH）3, indicating that the hydration process is very rapid. The as-prepared La（OH）3 is almost entirely with a needle- or rod-like shape with a width of 2 - 3 μm and a length of 5 - 8 μm. The mechanism of the formation of La（OH）3 with rod-like morphology was preliminarily presented. It is easier to expand the simple hydration process on a large scale than the hydrothermal process.     

Synthesis and Crystal Structure of A Bimetallic Terbium Complex Tb2 {μ-CH2 SiMe2 NC6 H3 ^iPr2 -2, 6}3 （THF）3

The reaction of 2, 6-^iPr2CbH3NHSiMe3 with Tb（CH2SiMe3）3（THF）2 in benzene at room temperature afforded a binuclear terbium complex Tb2 {μ-CH2 SiMe2 NC6 H3 ^iPr2 -2, 6}3（THF）3. X-ray diffraction revealed that Tb atoms were bridged by three methylene units. One Tb atom was six-coordinated by two nitrogen atoms, three methylene carbons, and one THF molecule, while the other Tb atom was six-coordinated by one nitrogen atom, three methylene carbons, and two THF molecules. Both Tb atoms adopted a distorted trigonal prism geometry.     

Flux and concentration effect on Eu^3＋ doped Gd2（MoO4）3 phosphor

A novel red emitting phosphor Gd2（MoO4）3：Eu^3＋ was prepared by solid reaction, using Gd2O3, Eu2O3 and WO3 as starting matedals and NH4F as flux. The effects of flux content and Eu^3＋ concentration on the crystal structure, morphology and luminescent properties were investigated using XRD, SEM and fluorescent spectrum measurement. The XRD patterns showed that the resultants had the monoclinic structure. With the increase in flux amount, their crystallization significantly improved. The SEM images indicated that the mean size of the phosphor particles was around 2 μm, and agglomeration of the phosphor particles appeared while introducing higher flux amount. The excitation spectra exhibited more intense f-f transitions originating from ground state 7^F0 to upper states 5^L6 and 5^D2 than the charge transfer band. The concentration quenching of Eu^3＋ emission indicated that energy transfer from Eu^3＋ to molybdate host existed even at lower Eu^3＋ concentration.     

正极材料LiNi1/3Co1/3Mn1/3O2的Mg掺杂及电化学性能

为提高正极材料LiNi_1/3Co_1/3Mn_1/3O₂的循环性能, 采用氢氧化物共沉淀法对前驱体进行Mg掺杂, 再经过混锂、球磨、高温煅烧后, 分别对掺杂与未掺杂的正极材料进行了XRD、SEM及电化学性能的比较.研究结果表明:掺杂与未掺杂的正极材料都为标准的α-NaFeO₂型层状结构, 粒度大小无明显变化; 对于掺杂量为0.03与未掺杂的正极材料, 首轮放电比容量分别为138.2 mAh/g和145.3 mAh/g; 而循环50轮的放电比容量则分别为131.1 mAh/g和119.5 mAh/g.由此可见, 通过Mg掺杂, 正极材料的首轮放电比容量虽有少量降低, 而循环性能却有明显增强.      

Preparation of Mesoporous Ce0.5Zr0.5O2 Mixed Oxide by Hydrothermal Templating Method

Mesoporous Ce0.5Zr0.5O2 mixed oxide with high specific surface area was synthesized under basic condition in the presence of non-ionic surfactant PEG-4000. The effect of synthesis conditions, such as synthesis temperature and the molar ratio of PEG-4000/（[ Ce] ＋ [ Zr] ）, on specific surface area were investigated. The products were characterized by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption-desorption measurements, respectively. The results showed that synthesis temperature and the molar ratio of PEG-4000/（[ Ce] ＋ [ Zr] ） had great influence on specific surface area. Under the optimum synthesis conditions, the prepared Ce0.5Zr0.5O2 mixed oxide presented cubic fluorite-type structure and possessed high surface area of 148.6 m2·g^-1 with wormlike pores.