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Chinese Journal of High Pressure Physics  > 2004  >  18(1): 27-35 .
SONG Gong-Bao, HAN Cang-Qiong, LIANG Jing-Kui, RAO Guang-Hui. The Extent and Crystal Structure of the Solid Solution Based on Ca2Pr2Cu5O10[J]. Chinese Journal of High Pressure Physics, 2004, 18(1): 27-35 . doi: 10.11858/gywlxb.2004.01.006
Citation: SONG Gong-Bao, HAN Cang-Qiong, LIANG Jing-Kui, RAO Guang-Hui. The Extent and Crystal Structure of the Solid Solution Based on Ca2Pr2Cu5O10[J]. Chinese Journal of High Pressure Physics, 2004, 18(1): 27-35 . doi: 10.11858/gywlxb.2004.01.006
shu

The Extent and Crystal Structure of the Solid Solution Based on Ca2Pr2Cu5O10

doi: 10.11858/gywlxb.2004.01.006
  • 1.

    School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621002, China;

  • 2.

    Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;

  • 3.

    International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China

More Information
  • Corresponding author: SONG Gong-Bao
  • Received Date: 24 May 2003
  • Rev Recd Date: 22 Sep 2003
  • Publish Date: 05 Mar 2004
    Abstract
  • The extent and crystal structure of the solid solution based on Ca2Pr2Cu5O10 were studied by X-ray diffraction combined with Rietveld structure refinement. According to the principle of valence neutralization and the disappearing-phase method, in the Ca-rich region (i.e. Ca/Pr1) the composition of solid solution can be expressed as the general stoichiometry Ca2+xPr2-xCu5O10, and in the Pr-rich region (i.e. Ca/Pr1) as Ca1.7Pr2.2Cu5O10, Ca1.4Pr2.4Cu5O10, i. e., the solid solubility of the Ca2Pr2Cu5O10-based solid solution can be determined as from Ca2.4Pr1.6Cu5O10 to Ca1.4Pr2.4Cu5O10. The crystal structure of Ca2Pr2Cu5O10 based solid solution is an incommensurate phase based on the orthorhombic NaCuO2-type subcell. The lattice parameters of Ca2.4Pr1.6Cu5O10 subcell are a0=0.282 46(7) nm, b0=0.636 93(1) nm, c0=1.067 94(1) nm, and its orthorhombic superstructure is with a=5a0, b=b0, c=5c0. The Ca2.4Pr1.6Cu5O10 structure is also determined by using a monoclinic supercell with space group P21/c, Z=4, a=5a0, b=b0, c=c0/sin and =104.79or 136.60, V=5a0b0c0. In the structure of the solid solution based on Ca2Pr2Cu5O10, the mutual substitution between Pr and Ca is possible in some bound. Furthermore, they are distributed disorderly in the structure.

     

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