Ce—Zr—固溶体的制备和表征

采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶、凝胶 柠檬酸溶胶－凝胶法制备了Ｃｅ－Ｚｒ－Ｏ复合氧化物并进行了表征。溶胶－凝胶法制得的Ｃｅ－Ｚｒ－Ｏ为立方的Ｃｅ０．５Ｚｒ０．５Ｏ２复合氧化物（其中少量具有立方性质的ｔ＾〃相）,而直接分解和共沉淀法制得的是由立方Ｃｅ０．８Ｚｒ０．２Ｏ２和四方Ｃｅ０．２Ｚｒ０．８Ｏ２固溶体组成的复合氧化物。不同制备方法制得的样品由于物相组成不同,还原性能也有较大差别。差热     

用钼酸盐和罗丹明B连续光度法测定铈和钪

聚乙烯醇存在下，铈或钪钼杂多酸与罗丹明Ｂ（ＲＢ）形成离子缔合物，最大吸收均位于５７０ｎｍ，摩尔吸光系数分别为１．１６×１０＾６和５．６２×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，ｃｍ＾－１，０－１．２μｇ／２５ｍＬＣｅ和０－２．０μｇ／ｍＬＳｃ服从比耳定律，检测限１．５ｎｇ／ｍＬＣｅ（ｎ＝１０）和１．１ｎｇ／ｍＬＳｃ（ｎ＝９）。缔合物的摩尔比为Ｃｅ：ｍＯ：ＲＢ＝１：６：３和 Ｓｃ：Ｍｏ：ＲＢ＝１：１     

（Y（NTO）2NO3（H2O）5）.2H2O的制备,晶体结构和热分解机理的…

合在了（Ｙ（ＮＴＯ）２ＮＯ３（Ｈ２Ｏ）５）．２Ｈ２Ｏ（ＮＴＯ为３－硝基－１，２，４－三唑－５－酮）并测定了晶体结构，晶体属单斜晶系，空间群Ｃｍ，晶胞参数：ａ＝０．６７７３（２）ｎｍ，ｂ＝２．０８６６（２）ｎｍ，ｃ＝０．６５５１（１）ｎｍ；β＝１０２．９８（２）°Ｖ＝０．９０２１（１）ｎｍ＾３，Ｚ＝２，Ｄｃ＝１．９７０ｇ．ｃｍ＾－３，μ＝３３．４９ｃｍ＾－１，Ｆ（０００）＝５４０，Ｒ＝０．０３２，中     

催化动力学光度法测定痕量苯酚

研究了在硫酸介质中苯酚对Ｉ＾－１催化Ｃｅ＾４＋－Ａｓ（Ⅲ）反应的抑制作用及其动力学条件。建立了用催化动力这光度法测定痕量苯酚的新方法，结果表明，在０．００１ｍｏｌ／ＬＣｅ（ＳＯ４）２，０．００１２５ｍｏｌ／Ｌ，Ａｓ２Ｏ３，０．０１ｍｇ／Ｌ，ＫＩ，０．０１２５ｍｏｌ／Ｌ，Ｈ２ＳＯ４和０．１３％（ｗ／ｖ）ＮａＣｌ溶液中测定苯酚，其表面摩尔吸光系数为２．１×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，线性范围     

双臂套索冠醚双核铜（II）配合物的磁性质研究

测定了双臂套索冠醚双核铜（Ⅱ）配合物［Ｃｕ２Ｌ（ＯＨ）］（ＣｌＯ４）３Ｍｅ２ＣＯ（Ｌ－Ｎ，Ｎ＇－二（８－喹啉甲基）－１，４，１０，１３－四氧－７，１６－二氮环八环）的变温磁化率（４￣３００Ｋ），所加场强为５．０×１０＾５Ａ／ｍ，拟合了变温磁化率数据，得到Ｊ＝－２７９．４ｃｍ＾－２；加上分子场校正后，得Ｊ＝－２５７．７ｃｍ＾－１，Ｚｊ＇＝－３０．１ｃｍ＾－１。拟合结果表明，分子间存在反铁磁性交换作用     

纳米晶（CeO2）1—x（BiO1.5）x固溶体的水热合成与离子输运性 …

在２４０℃水热体系中首次合成出系列纳米晶固溶体（ＣｅＯ２）１－ｘ（ＢｉＯ１．５）ｘ（ｘ＝０．０￣０．５０）。产物采用Ｘ射线衍射,扫描电子显微镜和Ｘ射线光电子能谱仪进行表征。Ｂｉ２Ｏ３在ＣｅＯ２中的固溶限约为５０％。所有固溶体结晶属立方萤石结构,粒度范围为１０￣１８ｎｍ。当Ｂｉ２Ｏ３掺杂量小于固溶限时,于８００℃烧结不会导致结构转变。而对于（ＣｅＯ２）０．５（ＢｉＯ１．５）０．５,于８００℃在空气中     

析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ（Ⅱ）－ＰＥＧ（聚乙二醇－２０００）－Ｚｉｎｃｏｎ（锌试剂）－（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ（Ⅱ）。最宜酸度为ｐＨ５．５～８．５（ＫＨ２ＰＯ４－Ｋ２ＨＰＯ４）缓冲溶液）其络合物的最大吸收位于６１０ｎｍ，表观摩尔吸光系数为４．０×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ（Ⅱ）浓度在０～１．５ｍｇ／Ｌ范围内服从比尔定律，铜与Ｚｉｎｃｏｎ形式组成为１：２的稳定的蓝色络     

等瓣置换反应的研究——手性簇合物[η^—MeO2CC5H4）（CO）2Mo…

用Ｘ射线衍微法测定了由η＾５－ＭｅＯ２ＣＣ５Ｈ４（ＣＯ）３ＭｏＮａ和〔（η＾５－ＭｅＯ２ＣＣ５Ｈ４）（ＣＯ）２Ｗ〕Ｆｅ－（ＣＯ）３Ｃｏ（ＣＯ）３（μ３－Ｓ）的等瓣置换反应所生成的手性簇合物－〔（η＾５－ＭｅＯ２ＣＣ５Ｈ４）（ＣＯ）２Ｍｏ〕－〔（η＾５－ＭｅＯ２ＣＣ５Ｈ４）（ＣＯ）２Ｗ〕Ｆｅ（ＣＯ）３（μ３－Ｓ）的分子结构及晶体结构。晶体属Ｐ１空间群，晶胞参数ａ＝０．８７１６２（５）ｎｍ，ｂ＝０．８     

等瓣置换反应的研究──手性簇合物［（η~5－MeO_2CC_5H_4）（CO）_2Mo］·［（η~5－MeO_2CC_5H_4）（CO）_2W］Fe（CO）_3（μ_3－S）的分子结构及晶体结构

用Ｘ射线衍射法测定了由η~５－ＭｅＯ_２ＣＣ_５Ｈ_４）（ＣＯ）_３ＭｏＮａ和［（η~５－ＭｅＯ_２ＣＣ_５Ｈ_４）（ＣＯ）_２Ｗ］Ｆｅ－（ＣＯ）_３Ｃｏ（Ｃｏ）_３（μ_３－Ｓ）的等瓣置换反应所生成的手性簇合物──［（η~５－ＭｅＯ_２ＣＣ_５Ｈ_４）（ＣＯ）_２Ｍｏ］－［（η~５－ＭｅＯ_２ＣＣ_５Ｈ_４）（ＣＯ）_２Ｗ］Ｆｅ（ＣＯ）_３（μ_３－Ｓ）的分子结构及晶体结构。晶体属Ｐ１空间群，晶胞参数α＝０．８７１６２（５）ｎｍ，ｂ＝０．７６２１８（４）ｎｍ，ｃ＝１．８７１１１（８）ｎｍ；α＝９４．１６４（４）°，β＝９７．９７９（２）°，γ＝９９．１０８（２）°，Ｚ＝２，μ＝５．９ｃｍ~（－１）。最终的一致性因子Ｒ＝０．０３６，Ｒｗ＝０．０３７．该簇合物含ＭｏＷＦｅＳ四面体簇核，其中Ｍｏ、Ｗ原子以１：１的比例无序地分占了四面体的２个顶点．     

（四甲基二硅撑）二（3－三甲硅基环戊二烯基）四羰基二铁及其相关化合物的合成及结构

１，２－二（三甲硅基环戊二烯基）四甲基二硅烷与Ｆｅ（ＣＯ）_５在二甲苯中于１０５～１１０℃反应除分离到少量标题化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２（５）外，主要是生成了脱Ｍｅ_３Ｓｉ基的产物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η－Ｃ_５Ｈ_４Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２（１）及１的热重排异构体［Ｍｅ_２ＳｉＣ５Ｈ４－Ｆｅ（ＣＯ）_２］_２（２）．将５的二甲苯溶液加热回流１８ｈ，则转化为其异构体［Ｍｅ_２Ｓｉ（Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２（６）．脱硅基发生在由相应反应物制备５的过程中。且脱硅基是与反应物中（Ｍｅ_２ＳｉＳｉＭｅ_２）桥的存在有关．５的晶体结构经Ｘ射线衍射测定属单斜晶系，Ｐ２_１／ｍ空间群，晶体学数据：ａ＝０．６７８０（１）ｎｍ，ｂ＝２．２３０３（９）ｎｍ，ｃ＝０．９９８８（１）ｎｎ，；β＝９８．９６（１）°，Ｖ＝１．４９６０ｎｍ~３．Ｚ＝２，Ｄ_ｃ＝１．３６ｇ／ｃｍ~３．     

Magnetoresistance in La0.5Sr0.5MnO2.5

Resistance measurements indicate the presence of magnetoresistance in the La_0.5Sr_0.5MnO_2.5 brownmillerite related compound. An 80 % of magnetoresistance is found at 75 K. In spite of the partial break‐up occurring at the 3D network of octahedra sharing corners, characteristic of the full oxygen content perovskite phase, the oxygen deficient compound exhibits complex magnetic and electric properties. Such behavior can be explained on the basis of ferromagnetic and metallic clusters randomly distributed at the octahedral layers separated from each other by an insulating antiferromagnetic matrix. AC susceptibility measurements suggest spin glass behavior at low temperature as a consequence of the competition between different magnetic interactions.     

Amorphous Mo-doped NiS0.5Se0.5 Nanosheets@Crystalline NiS0.5Se0.5 Nanorods for High Current-density Electrocatalytic Water Splitting in Neutral Media

It is vitally important to develop highly active, robust and low-cost transition metal-based electrocatalysts for overall water splitting in neutral solution especially at large current density. In this work, amorphous Mo-doped NiS_0.5Se_0.5 nanosheets@crystalline NiS_0.5Se_0.5 nanorods (Am−Mo−NiS_0.5Se_0.5) was synthesized using a facil one-step strategy. In phosphate buffer saline solution, the Am−Mo−NiS_0.5Se_0.5 shows tiny overpotentials of 48 and 209 mV for hydrogen evolution reaction (HER), 238 and 514 mV for oxygen evolution reaction (OER) at 10 and 1000 mA cm⁻², respectively. Moreover, Am−Mo−NiS_0.5Se_0.5 delivers excellent stability for at least 300 h without obvious degradation. Theoretical calculations revealed that the Ni sites in the defect-rich amorphous structure of Am−Mo−NiS_0.5Se_0.5 owns higher electron state density and strengthened the binding energy of H₂O, which will optimize H adsorption/desorption energy barriers and reduce the adsorption energy of OER determining step.     

SrAu0.5Pt0.5 and CaAu0.5Pt0.5, analogues to the respective Ba compound,but featuring purely intermetallic behaviour

Both, SrAu_0.5Pt_0.5 and CaAu_0.5Pt_0.5, have been synthesized by reaction of corresponding mixtures of the pure elements at 1223 K in an argon atmosphere, and characterized by single-crystal X-ray analysis as well as by magnetic susceptibility and electric resistivity measurements. The new compounds crystallize in the CrB type of structure and thus are isostructural to BaAu_0.5Pt_0.5 (SrAu_0.5Pt_0.5: Cmcm; a = 4.262(1) Å; b = 11.435(3) Å; c = 4.632(1) Å; Z = 4; CaAu_0.5Pt_0.5: Cmcm; a = 3.9858(4) Å; b = 10.920(1) Å; c = 4.5249(5) Å; Z = 4). SrAu_0.5Pt_0.5 as well as CaAu_0.5Pt_0.5 are poor metallic conductors with ρ_300K = 0.95 mΩ.cm and ρ_300K = 3.93 mΩ.cm, respectively, and featuring diamagnetic behaviour.According to ESCA measurements SrAu_0.5Pt_0.5 and CaAu_0.5Pt_0.5 both can be formulated as having intermetallic character, showing a negligible electron transfer from alkaline earth metals to the noble metals.     

Magnetoelectric perovskite (Bi0.5Pb0.5)(Fe0.5Zr0.5)O3: Preparation,structural and magnetic properties

The perovskite (Bi_0.5Pb_0.5)(Fe_0.5Zr_0.5)O₃ was synthesized by solid-state reaction in an attempt to find magnetoelectric materials, in which ferroelectricity and ferromagnetism coexist. This complex perovskite has been studied by X-ray and neutron powder diffraction in combination with magnetic measurements. The compound crystallizes in the orthorhombic space group Pbam with a ～ √2a_p, b ～ 2√2a_p and c ～ 2a_p (with a_p ～ 4.057 Å). The field and temperature dependence of the magnetization combined with neutron diffraction data showed antiferromagnetic behavior with the Neel temperature, T_N ～ 450 K. Rietveld refinements of neutron powder diffraction data collected at different temperatures, between 10 and 700 K, have been carried out in order to extract information about the thermal evolution of the nuclear and magnetic structures. A distorted orthorhombic perovskite structure was found within the whole temperature interval. The Bi/Pb and Fe/Zr ions were found to be partially ordered over the perovskite A-site and disordered over the B-site. The neutron diffraction patterns of the (Bi_0.5Pb_0.5)(Fe_0.5Zr_0.5)O₃ sample showed evidence of a long-range magnetic ordering below T_N with a propagation vector k = (0,0,0) and an antiferromagnetic arrangement of the magnetic moments of the Fe³⁺ cations in the B-site. This is consistent with an A_y-type magnetic structure. The factors governing the structural and magnetic properties of (1 ? x)BiFeO₃–xPbZrO₃ solid solutions are discussed and compared with those of pure BiFeO₃ and PbZrO₃. A solid solution strategy for developing magnetoelectric properties in BiFeO₃-based compounds is described, with the aim of realizing both a spontaneous polarization and magnetization at room temperature.     

Ultra-incompressible Ternary Diborides Re_（0.5）Ir_（0.5）B_2,Re_（0.5）Tc_（0.5）B_2,Os_（0.5）W_（0.5）B_2 and Os_（0.5）Ru_（0.5）B_2：Density Functional Calculation

In this paper, density functional computations have been applied to the structural, elastic and electronic properties of ternary transition metal diborides Re0.5Ir0.5B2, Re0.5Tc0.5B2, Os0.5W0.5B2 and Os0.5Ru0.5B2 in hexagonal (P63/mmc) and orthorhombic (Pmmn) structures with both local density approximation and generalized gradient approximation. LDA gives smaller lattice parameters and larger elastic moduli than GGA. Both results show that the hexagonal ones are more stable than orthorhombic ones except Os0.5Ru0.5B2. Moreover, the hexagonal structure has superior elastic property than orthorhombic one. Generally speaking, the calculated elastic moduli of Re0.5Ir0.5B2 and Os0.5Ru0.5B2 are smaller than those values of Re0.5Tc0.5B2 and Os0.5W0.5B2 within the same structure because of the filling of antibonding states. The relativistic effects result in weaker bonds of Tc-B (Ru-B) than those of Re-B (Os-B). All the diborides are ultra-incompressible. Re0.5Tc0.5B2 has the largest shear modulus and it is a promising superhard diboride like Os0.5W0.5B2. The elastic properties are in high correlation with the bond strength. The shear moduli are more sensitive than the bulk moduli to the bond strength.     

Effect of ZnO on sintering and microwave dielectric properties of 0.5CaTiO3-0.5 (Li0.5La0.5) TiO3 ceramics

The novel calcium titanate-lithium lanthanum titanate doped with zinc oxide (0.10, 0.30, and 0.50 mol. %) ceramic samples were prepared by solid-state reaction route. The phase formation, microstructure, densification, and microwave dielectric properties were investigated. It was found that the doping with zinc oxide led to a decrease in sintering temperature by 25 ^oC as compared with pure calcium titanate lithium lanthanum titanate due to the liquid phase effect. Also, the calcium titanate lithium lanthanum titanate (10ZCTLLT&30ZCTLLT)) doped with lower zinc oxide (0.10 and 0.30 mol. %) led to higher densification parameter. This was followed by increasing the zinc oxide doping up to (0.50 mol. %) which resulted in a decrease in densification and microwave dielectric properties which may be attributed to increase in porosity and grain growth upon the evaporation of zinc and oxygen vacancy. This led to the increase in dielectric loss (≈10 × 10^?4) value with 50ZCTLLT. Hence, the best result of microwave dielectric characteristics was obtained for 0.5CaTiO₃–0.5(Li_0.5La_0.5)TiO₃ with (0.10 and 0.30 mol. % ZnO) 10ZCTLLT and 30ZCTLLT ceramic samples sintered at 1175 ^oC/2h, with low dielectric constant (ε_r) = 4.4–10.5, very low dielectric loss = 1.07-2.23 × 10^?4 and high quality factor (Q x ?) ≈59-55 × 10⁴ at 8 GHz. Consequently, they can be used not only in wireless satellite communications technology but also can be used in the fifth-generation telecommunication 5G technology construction.     

稀土取代的复合氧化物Eu_（0．5）RE_（0．5）Fe_（0．5）Mn_（0．

利用固相反应合成了稀土取代的复合氧化物Ｅｕ_（０．５）ＲＥ_（０．５）Ｆｅ_（０．５）Ｍｎ_（０．５）Ｏ_３（ＲＥ＝Ｌａ，Ｐｒ，Ｎｄ，Ｓｍ，Ｇｄ，Ｔｂ，Ｄｙ，Ｈｏ，Ｅｒ，Ｔｍ，Ｙｂ）．测量了这些化合物的ＸＲＤ和ＸＰＳ谱。在ＸＰＳ研究中发现，稀土取代而使稀土元素本身的结合能相对于其倍半氧化物中的有所降低；在取代的复合氧化物中，随着ＲＥ离子半径的减小，Ｆｅ、Ｍｎ的结合能随之增加。     

Synthesis and structure of CsLi0.5Al0.5PO4

A new phosphate CsLi_0.5Al_0.5PO₄ with a structure related to the β-tridymite structure has been synthesized by a precipitation method. X-ray powder diffraction, electron probe microanalysis, second harmonic generation of laser radiation, and IR spectroscopy have been used for studying the compound. Differential scanning calorimetry shows that the synthesized phosphate undergoes phase transitions at T _tr = 68 and 130°C. The crystal structure of CsLi_0.5Al_0.5PO₄ was refined on the basis of X-ray powder diffraction data by the Rietveld method in space group P2₁/a (Z = 8) with the unit cell parameters a = 17.8323(3) Å, b = 5.4250(1) Å, c = 9.3666(2) Å, β = 89.984(8)°, V = 906.10(9) ų.