Synthesis,characterisation and structural studies of Rb x Mn[Fe(CN)6]

We present the synthesis and detailed characterisation of the Rb _x Mn[Fe(CN)₆] compound. The composition of the material significantly depends on the applied preparative conditions. Analysis of spectroscopic results (EDX,?Raman) and X-ray powder diffraction data yielded a further assessment of the difference in structural features. The characteristic individual magnetic behaviour, as well as the metal-to-metal charge transfer capabilities of the various samples, could be related to significant changes within the structures that appear to be associated with the synthetic method used.     

Characterizations of trimetallic heteronuclear Bi1−x La x [Fe(CN)6]·n(H2O) complexes and their thermal decomposition products

Heteronuclear Bi_1−x La _x [Fe(CN)₆]·nH₂O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TGA), Auger electron spectroscopy (AES) with scanning electron microscope (SEM), and transmission electron microscopy (TEM). The crystal system of the complexes was orthorhombic having n = 4 for x = 0–0.7 and was hexagonal having n = 5 for x = 1.0. Their mixture was confirmed for x = 0.8 and 0.9. The lattice parameters for the orthorhombic increased with increasing the x value for the complexes. The single phase of trimetallic perovskite-type Bi_1−x La _x FeO₃ was obtained by its thermal decomposition at low temperature. The crystal system was hexagonal for BiFeO₃ (x = 0) and orthorhombic for x = 0.1–1.0. In the case of the decomposed perovskite sample, the lattice parameters decreased with increasing x values for Bi_1−x La _x FeO₃. The particle size was ca. 30 nm for Bi_0.2La_0.8FeO₃ obtained by thermal decomposition at 500 °C and it grew with an increase in decomposition temperature. For the Bi_0.5La_0.5FeO₃, AES showed that the elemental distributions of Bi, La, and Fe on the surface were very homogeneous for the sample decomposed at 700 °C.     

Synthesis and properties of poly(organophosphazenes) electrolyte [NP(NHC6H5)2−x(NHC6H4SO3H-p)x]n

Poly(anilino sulphanic)phosphazene [NP(NHC₆H₅)_2–x (NHC₆H₄SO₃H) _x ] _n was prepared by the reaction between poly(anilino)phosphazene [NP(NHC₆H₅)₂] _n and sulphonic chloride (HSO₃Cl) in tetrachloroethane solvent. It was found that the glass transition temperature and conductivity of poly(anilino sulphanic)phosphazene increased with increasing value ofx. In addition, the storage power of the polymer withx=0.74 was determined and they were possible to charge by repitation of the use.     

高质量水系钠离子电池正极Fe4[Fe(CN)6]3的合成及其电化学性能

采用水热法合成高质量的Fe₄[Fe(CN)₆]₃(HQ-FeHCF)纳米材料, 并对材料进行X射线衍射(XRD), 扫描电子显微镜(SEM), 透射电子显微镜(TEM)和热重分析测试(TGA)等表征。结果表明：Fe₄[Fe(CN)₆]₃呈规则立方体, 颗粒大小约500 nm, 属面心立方结构。Fe₄[Fe(CN)₆]₃在NaClO₄-H₂O-聚乙二醇电解液中1C、2C、5C、10C、20C、30C和40C的容量分别为124、118、105、94、83、74和64 mAh·g ^-1, 表现出优异的倍率性能; 以5C倍率循环500次, 容量保持率接近100%, 表现出极佳的循环稳定性。以Fe₄[Fe(CN)₆]₃和磷酸钛钠分别为正负极的全电池工作电压高达1.9 V, 能量密度可达126 Wh·kg ^-1; 以5C倍率恒流充放电测试140次后全电池容量保持率为92%, 且库伦效率始终接近100%。     

Synthesis of Fe x O y nanoparticles during iron oxidation by supercritical water

It is established that iron is oxidized by supercritical water (SCW) with the formation of H₂ and nanoparticles of iron oxides (Fe₃O₄, FeO, and γ-Fe₂O₃). The kinetics of H₂ production and iron oxidation has been studied by SCW injection at T = 673, 723, 773, 823, and 873 K into a reactor with iron particles. Data of X-ray diffraction and transmission electron microscopy show that the phase composition and morphology of synthesized oxide nanoparticles depend on the SCW temperature.     

Soft chemistry synthesis,structure and electrochemical characterization of iron phosphates Fe(H2PO4)3 and Fe(PO3)3

The iron phosphate, Fe(H₂PO₄)₃, was synthesized through a precipitation route by means of acidic media. As the compound is highly hygroscopic, the structure was solved ab initio by powder X-ray diffraction under nitrogen flow at room temperature and 200 °C. This phase is antiferromagnetic below 30 K. It converts into Fe(PO₃)₃ at 550 °C, after dehydration. Electrochemical characterizations, performed on the last compound, show irreversible decomposition into metallic iron.     

Crystal structure of a new organic dihydrogenomonophosphate (C6H8N3O)2(H2PO4)2

Chemical preparation, X-ray single-crystal, thermal behavior, and IR spectroscopy investigations are given for a new organic cation dihydrogenomonophosphate (C₆H₈N₃O)₂(H₂PO₄)₂ (denoted IAHP) in the solid state. This compound crystallizes in the orthorhombic space group P2₁2₁2₁. The unit cell dimensions are: a = 7.422(3) Å, b = 12.568(5) Å, c = 20.059(8) Å with V = 1871.1(13) Å³ and Z = 4. The structure has been solved using direct method and refined to a reliability R factor of 0.029. The atomic arrangement can be described as inorganic layers of H₂PO₄⁻ anions between which are located the organic groups (C₆H₈N₃O)⁺ through multiple hydrogen bonds.     

K3[Fe(CN)6]浓度对PEO法制备硫改性Fe3O4膜层结构和降解性能的影响

为了提高铁基类Fenton催化剂的活性,利用等离子体电解氧化法在钛合金上制备出了硫改性Fe3O4膜层类Fenton催化剂,研究了电解液中铁源K3[Fe(CN)6]的浓度对膜层的结构组成和降解苯酚性能的影响.采用SEM、EDS和XRD对催化剂的表面形貌和相组成进行了表征,以苯酚为目标降解物评价其类Fenton催化活性.结...     

Structural and Magnetic Properties of Sm_3(Fe,Ti)_(29) and Sm_3(Fe,Ti)_(29)X_y (X=H, N) Compounds

1. IntroductionRecelltly new intermetallic compounds NdZ(Fe,Ti)lo and RZ(Feo.91Vo.og)19 (R=Y, Nd, Sin, Gd) werediscovered by Collocott et al.II] and Shcherbakovaat al.IZ], respectively. The crystal structure of thesenew phases has been identified to be Nd3(Fe, Ti)29type structure using X-ray diffraction by Li et al.I3].Among them, the Sin3(Fe,Ti)29N. compound exhibitsstrong uniaxial anisotropy' and its saturation magnetization is very close to that of S.,Fe,,N;'] compound.The hydr…     

Synthesis of monodisperse organic- and water-soluble iron oxide nanoparticles using Fe(OH)3 as precursor

The precursors used to prepare high-quality nanoparticles by high-temperature decomposition are expensive and toxic organometallic compounds. Fe(OH)₃, an inexpensive and environmentally friendly iron-containing compound, is for the first time introduced to act as an precursor to generate monodisperse iron oxide nanoparticles. The obtained nanoparticles are characterised by transmission electronic microscopy, IR, XRD and vibrating sample magnetometer. Organic-soluble ferromagnetic rod-like and superparamagnetic dot-like nanoparticles with the size ranging from 12 to 25?nm are obtained in a nonpolar solvent by adjusting reaction parameters, such as surfactant concentration and reaction time. Water-soluble nanoparticles can be synthesised when a bipolar solvent is used instead of nonpolar solvent. The results show that Fe(OH)₃ is a promising precursor for the high-temperature decomposition method.     

铜在甲胺-铁氰化钾化学机械抛光液中的腐蚀与钝化

用电化学测试技术研究了腐蚀介质和成膜剂浓度对铜表面的腐蚀与钝化成膜的影响,分析了钝化膜的成分,探讨了钝化膜在抛光压力和转速作用下的磨损与表面再钝化的行为,测量了铜在化学机械抛光过程中的极化曲线。结果表明铜在甲胺溶液介质铁氰化钾抛光液中易钝化,钝化膜的主要成分为Cu4[Fe(CN)6],有少量Cu20存在。钝化膜的磨损特性随成分浓度不同而不同。钝化膜的磨损难易程度与钝化膜的本身特性、抛光压力及转速有关。抛光过程中因钝化膜被磨损,腐蚀加快,腐蚀电流密度大幅增加。配方0．1％甲胺溶液 0．5％K3Fe(CN)6 5％Al2O3可行。     

Fe2O3 core-NaCo[Fe(CN)6] shell nanoparticles—Synthesis and characterization

A facile precipitation route was developed for the synthesis of cobalt hexacyanoferrate (CoHCF) as a thin shell around cores of nanoparticles of iron(III) oxide, forming nanoparticles of iron(III) oxide@CoHCF (n-Fe₂O₃@NaCo[Fe(CN)₆]). The morphology and structure of the as-prepared n-Fe₂O₃@NaCo[Fe(CN)₆] were characterized by the techniques of electron microscopies, X-ray diffraction measurements, X-ray photoelectron spectroscopy, infrared spectroscopy and thermogravimetry. Carbon composite electrodes of n-Fe₂O₃@NaCo[Fe(CN)₆] were prepared and the electrochemical behavior of the nanoparticles was evaluated using cyclic voltammetry. The redox couples of n-Fe₂O₃@NaCo[Fe(CN)₆] were investigated and the diffusion coefficients of counter cation in the shell of CoHCF were obtained. The effect of size of particles and the structure of CoHCF was also evaluated. n-Fe₂O₃@NaCo[Fe(CN)₆] represented prominent electrocatalytic activity toward the oxidation of some biologically active compounds.     

Mössbauer spectrometric study of Sm2Fe17N x (x=0–8)

Ternary rare-earth-iron-nitrogen compounds of Sm₂Fe₁₇N _x with x ranging from 0 up to 8, which have a rhombohedral structure of Th₂Zn₁₇ and a high Curie temperature up to 475–480°C depending on the degree of nitrogenation, were prepared by the nitrogenation of arc-melted Sm₂Fe₁₇ in mixed ammonia and hydrogen gas atmospheres of various ratios, and Mössbauer spectra of these compounds were observed at room temperature in order to analyse the physicochemical state of the nitrogenated products. The obtained data were analysed by focusing main attention on the effect of degree of nitrogenation on the variation of spectral profiles. Paramagnetic peaks due to an amorphous compound became prevalent as x became higher than ~ 2.3.     

Hybrid Molecular Metals Based on BEDO-TTF Salts with Paramagnetic [CrNO(CN)5]3− and [M(CN)6]3− Anions, M=Fe, Cr

Two different β″-type crystals have been obtained in the syntheses of the title salts. The crystals show metallic behavior of conductivity and paramagnetic response from the metal complex anions.