La0．9Sr0．1Ga0．8Mg0．2O2．85固体电解质合成及其性能

在NH4OH-(NH4)2CO3沉淀体系中用相转移分离法制备了La0.9Sr0.1Ga0.8Mg0.2O2.85(LSGM1020)固体电解质前驱体,并在较低的烧结温度得到了纯度较高,杂质含量低的电解质陶瓷.用XRD,Raman光谱,直流四电极,交流阻抗谱和扫描电镜分析了电解质的晶体结构,电化学性能和显微结构.XRD和Raman分析表明LSGM1020电解质具有菱方钙钛矿结构,800oC时测量得到的氧离子电导率达到0.12S?cm-1.SEM和交流阻抗分析表明,烧结体具有良好的微观结构.采用相转移分离法合成LSGM1020有利于降低烧结温度,改善电解质的性能.     

电渣重熔用CaF2＋Al2O3和CaF2＋Al2O3＋CaO系熔渣传氧的研究

利用ＺｒＯ２固体电解质氧浓差电池测定了电渣重溶用ＣａＦ２＋Ａｌ２Ｏ３和ＣａＦ２＋Ａｌ２Ｏ３＋ＣａＯ系熔渣的氧渗透率，考察了熔渣成分及温度对熔渣传氧性能的影响。在１６７３－１８７３Ｋ和０．１ＭＰａ的氧气氛下，测得这两个渣系熔渣的氧渗透率分别为１×１０＾－２０－６×１０＾－１９和１×１０＾－２１－５×１０＾－１８ｍｏｌＯ２．ｃｍ＾－１．ｓ＾－１；随ＭｎＯ２，Ｆｅ２Ｏ３，Ｃｒ２Ｏ３，ＴｉＯ２，ＣａＦ２含     

磁电复合材料CuFe2O4/PbZr0.53Ti0.47O3的内耗与介电损耗

制备了组分为xCuFe2O4-(1-x)PbZr0.53Ti0.47O3(其中x=0．1，0．2，0．3，1．0)的磁电复合材料，XRD实验表明，样品中只存在着CuFe2O4和PbZr0.53Ti0.4703相．利用多功能摆测量了样品在低频下(0.1--6．4Hz)的内耗，同时利用HP4194A阻抗分析仪测量了样品低频(100Hz--1 MHz)的介电损耗，分析了复合物中CuFe2o4和PZT对内耗及介电损耗分别所作的贡献．     

内耗数据的非线性拟合及其在纯铝竹节晶界弛豫中的应用

根据Ｂｅｉｎｇｔｏｎ方法编写了一个可以同时拟合一条的由指数型背影和最多６个弛豫时间具有对数正态分布的内耗峰组成的内耗工曲线的计算机程序,以此方法为基础,定量分析了纯Ａｌ竹节晶界内耗峰的弛豫参数,结果表明,峰温从５３５Ｋ降至４６５Ｋ时,弛豫强度约降低１０％模量弛豫的变化约为４％,弛豫强度随着峰温的降低而有所减少。     

复合体材料CuFe2O4-Pb(Mg1/3Nb2/3)O3的内耗和介电损耗

用传统的固相反应方法制备了CuFe2O4-Pb(Mg1／3Nb2／3)O3复合体材料陶瓷，用X射线衍射确定了复合体材料中各相的存在．用双端振动簧法研究了样品在-200—400℃的音频内耗谱，在37．6℃发现一个很大的内耗峰P1，并伴随着约9％的模量的软化，表明了相变的存在．在室温下，测量了介电常数ε′和介电损耗tanδ随频率变化的关系；同时，测量了复合体材料的介电常数和介电损耗随温度的变化关系，进一步验证P1峰由立方到四方的相变引起．最后给出样品的磁滞回线。     

La2NiO4.147体系相变的低频内耗

通过电化学加氧方法获得额外氧含量δ=0．147、结构为Fmmm的La2NiO4 δ样品，低频内耗测量表明，400K温区附近存在一个相变内耗峰，它对应体系从低温正交Fmmm相到高温四方I4／mmm相的转变，模量和内耗的升、降温回滞现象反映此相变为一级相变．变频和改变升温速率内耗实验表明，内耗峰高与测试频率成反比，与升温速率成正比，具有马氏体相转变特征，低δ值的La2NiO4 δ样品无此相变峰，说明此峰应与低温正交Fmmm相中额外氧的三维有序变化相关。     

Facile synthesis of La2Mo2O9 nanoparticles via an EDTA complexing approach

A facile EDTA (ethylene diamine tetraacetic acid) complexing technique has been successfully employed to prepare La2Mo2O9 nanoparticles.The as-synthesized products are characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM),and Fourier transform infrared spectroscopy (FT-IR).The results show that a homogeneous transparent gel can be obtained with EDTA as the organic complexing reagent under the pH value of 3.0.Further thermal decomposition of the as-synthesized transparent gel by increasing the temperature up to 600℃ for 3 h results in the formation of La2Mo2O9 nanoparticles with a crystal size of about 30 nm.Moreover,the nanoparticles tend to form micrometer-sized aggregates with a three-dimensional network structure,which shows promising applications in solid oxide fuel cells (SOFC),catalysts and so on.     

Preparation and characterization of Li2Mo0.9La0.2O4 anode material

1. Introduction From the point of view of environmental conser-vation, there has been a growing interest in the re-search and development of lithium-ion batteries as a new-generation battery [1-2]. Its anode material was made mainly from LiCoO2 [3-4], LiNiO2 [5], and LiMn2O4 [6-8]. Yoshio et al. [9] prepared LiCoO2 using the com-plex compound of organic acid of Co. However, its capacity was restricted to 125 mA?h/g. Moreover, its price was high and it was toxic. The extent of appli-cati…     

THE STABILITY INVESTIGATION OF FERROELECTRIC SrBi_2Ta_2O_9 THIN FILMS ANNEALED IN FORMING GAS

The hysteresis loop changes of ferroelecric SrBi2Ti2O9 (SBT) thin films (330nm) vs the temperature of forming gas (5% hydrogen 95% nitrogen) annealing were measured when the annealing time was 1min and 10min. The selected annealing temperature was at 100℃, 200℃, 250℃, 300℃, 350℃, 400℃ and 450℃, respectively. Our results showed that the ferroelectric properties were easily destroyed and the leakage current changed abruptly when the SBT thin films were in their ferroelectric phase (<270℃). The space charges at the grain boundary may take an important role in absorption polarity molecular hydrogen when the SBT thin films were in the ferroelectric phase. The oxygen recovery experiments were also performed and investigated in this work.