0212型Ca_3Cu_2O_(4+δ)Cl_(2-y)化合物高温高压合成与研究  

High Temperature and High Pressure Synthesis and Study of 0212-Type Ca_3Cu_2O_(4+δ)Cl_(2-y)

作　　者：杨达晓[1] 刘清青[1] 高伟波[1] 于文[1] 李凤英[1] 靳常青[1] 

机构地区：[1]中国科学院物理研究所

出　　处：《高压物理学报》2007年第1期15-19,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金

摘　　要：利用“顶角氧掺杂”机制,即以二价氧部分替代顶角一价氯,用Ag2O做氧源,在高温高压下制备了单相的Ca3Cu2O4+δCl2-y样品。X射线衍射分析发现,随着Ag2O含量的增加,Ca3Cu2O4+δCl2-y样品的晶格常数a逐渐变小,c逐渐增大,体现了空穴掺杂的本质。进行了电阻率和磁化率测量,没有发现超导性,可能是空穴载流子没有达到合适的浓度所致。Using the apical oxygen doping mechanism,i, e. a partial substitution of divalence O for the monovalence Cl,we synthesized Ca3Cu2O4＋δCl2-y with AgzO under high temperature and high pres- sure. From X-ray diffraction composition analysis, we confirmed that Ca3 Cuz O4＋δCl2-y crystallizes into a 0212 structure. With increasing the content of Ag2O, we found that lattice parameters a shrinked but c increased. It suggested that it should be hole doping. We also investigated the temperature dependence of the electrical resistivity and DC magnetic susceptibility for two samples, but we didn＇t observe superconductivity. It maybe resulted from the too low density of hole carrier.

关 键 词：高温高压合成 顶角氧掺杂 Ca3Cu2O4Cl2 

分 类 号：O521[理学—高压高温物理] TM263[理学—物理]