【摘要】 使用RASA－5RP转靶四圆单晶衍射仪对由中国地质大学（武汉）超导小组合成的YBa₂CU₃O₇-X斜方相单晶样品进行了结构分析,采用MoKa收集到892个原始数据,测得的斜方晶胞参数为a₀=3.8231;b₀=3.8748;c₀=11.6721（?）(l（?）=10^-10m),α=β=γ=90°,空间群为Pmmm,求得了全部原子坐标、占位度、各向异性温度因子及健长键角数值,R=0.06.利用微分干涉显微镜观察到广泛发育的{110}格子双晶,拍摄出高质量的照片并讨论了四方相及斜方相在结构上的基本特征.更多还原

【Abstract】 A crystal structure analysis of YBa2Cu3O7-x orthorhombic supercondu-cting phase by RASA-5RP high power four circle single crystal diffractome-ter has been done. Sample being tested is synthesized by our research group inChina University of Geosciences.892 raw data were collected. Cell parametersobtained are as follows:a0 = 3.8231;b0 = 3.8748;c0 = 11.6721 A. α=β=γ=90℃,S. G.Pmmm.Coordinates,site occupancies, anisotropic thermal vibration factors, bond lengths and bond angles for all atoms are given in this paper, R= 0.06. A set of high quality photos showing // {110} twinning of YBa2 Cu3O7-x were succesfully taken by using differential interference microscope.Structural diffe-rences between tetragonal and orthorhombic phase of Y-Ba-Cu-O system are discussed.更多还原