固相线下Pr1-xBa2-yCax+yCu3O7体系的相关系和晶体结构

宋功保 梁敬魁 饶光辉

宋功保, 梁敬魁, 饶光辉. 固相线下Pr1-xBa2-yCax+yCu3O7体系的相关系和晶体结构[J]. 高压物理学报, 2004, 18(4): 309-314 . doi: 10.11858/gywlxb.2004.04.004
引用本文: 宋功保, 梁敬魁, 饶光辉. 固相线下Pr1-xBa2-yCax+yCu3O7体系的相关系和晶体结构[J]. 高压物理学报, 2004, 18(4): 309-314 . doi: 10.11858/gywlxb.2004.04.004
SONG Gong-Bao, LIANG Jing-Kui, RAO Guang-Hui. Subsolidus Phase Relation and Crystal Structure in the Pr1-xBa2-yCax+yCu3O7 System[J]. Chinese Journal of High Pressure Physics, 2004, 18(4): 309-314 . doi: 10.11858/gywlxb.2004.04.004
Citation: SONG Gong-Bao, LIANG Jing-Kui, RAO Guang-Hui. Subsolidus Phase Relation and Crystal Structure in the Pr1-xBa2-yCax+yCu3O7 System[J]. Chinese Journal of High Pressure Physics, 2004, 18(4): 309-314 . doi: 10.11858/gywlxb.2004.04.004

固相线下Pr1-xBa2-yCax+yCu3O7体系的相关系和晶体结构

doi: 10.11858/gywlxb.2004.04.004
详细信息
    通讯作者:

    宋功保

Subsolidus Phase Relation and Crystal Structure in the Pr1-xBa2-yCax+yCu3O7 System

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    Corresponding author: SONG Gong-Bao
  • 摘要: 利用X射线衍射分析和Rietveld结构精修的方法研究了固相线下Pr1-xBa2-yCax+yCu3O7体系的相关系和晶体结构。研究表明:950 ℃、空气条件下,Pr1-xBa2-yCax+yCu3O7(y=0)体系系列样品总是含有两相:Pr123(PrBa2Cu3O7)和BaCuO2;而且,随Ca含量的增加,杂相BaCuO2的含量也随之增加。Pr1-xBa2-yCax+yCu3O7(x=0)体系y=0.1、0.2、0.3、0.4的样品都只含有Pr123单相;y=0.5的样品含有3相:Pr123、Ca2CuO3和Pr4Ca10Cu24O41。另外,Pr1-xBa2-yCax+yCu3O7(x=0)系列样品(y=0.1、0.2、0.3、0.4)中Pr123相还发生了正交-四方晶系的结构转化。y=0.1和0.2的样品为正交晶系,晶胞参数分别为a=0.390 33(4)和0.389 36(1) nm,b=0.389 53(4)和0.387 73(1) nm,c=1.173 38(4) 和1.168 20(2) nm;y=0.3和0.4的样品为四方晶系,晶胞参数分别为a=b=0.387 80(0) 和0.387 67(0) nm,c=1.166 00(2) 和1.165 20(2) nm。在Pr123结构中,Ba离子可以被Pr离子代替,但不能被Ca离子所代替。Ca离子占据部分Pr离子的位置。在Pr1-xBa2-yCax+yCu3O7(x=0)体系中Pr、Ba和Ca离子间的相互替代中,离子半径比化学性质起到了更大的作用。在950 ℃、空气条件下,Ca离子在Pr1-xBa2-yCax+yCu3O7体系中的最大溶解量是当x=0时,y0.4。

     

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出版历程
  • 收稿日期:  2003-12-23
  • 修回日期:  2004-05-09
  • 发布日期:  2004-12-05

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