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Chinese Journal of High Pressure Physics  > 2004  >  18(4): 309-314 .
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
shu

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

doi: 10.11858/gywlxb.2004.04.004
  • 1.

    School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;

  • 2.

    Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;

  • 3.

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

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  • Corresponding author: SONG Gong-Bao
  • Received Date: 23 Dec 2003
  • Rev Recd Date: 09 May 2004
  • Issue Publish Date: 05 Dec 2004
    Abstract
  • Subsolidus phase relation and crystal structure in the Pr1-xBa2-yCax+yCu3O7 system were studied by X-ray diffraction combined with Rietveld structure refinement. The results indicate that all of the Pr1-xBa2-yCax+yCu3O7 (y=0) samples contain a BaCuO2 phase besides the Pr123 (PrBa2Cu3O7) phase under 950 ℃ in the air. Furthermore, the content of the BaCuO2 phase increases with increasing Ca content. The samples of Pr1-xBa2-yCax+yCu3O7 (x=0) (y=0.1, 0.2, 0.3, 0.4) contain only one phase, Pr123, except for the sample with y=0.5 which contains three phases, Pr123, Ca2CuO3 and Pr4Ca10Cu24O41. Otherwise, the Pr123 structure takes place the orthorhombic-tetragonal transition in the Pr1-xBa2-yCax+yCu3O7 (x=0) system (y=0.1, 0.2, 0.3, 0.4) with increasing Ca ion content. The structure of the Pr1-xBa2-yCax+yCu3O7 (x=0) samples with y=0.1 and 0.2 is orthorhombic. The lattice parameters are a=0.390 33(4)~0.389 36(1) nm, b=0.389 53(4)~0.387 73(1) nm, c=1.173 38(4)~1.168 20(2) nm; The structure of the Pr1-xBa2-yCax+yCu3O7 (x=0) samples with x=0.3 and 0.4 is tetragonal. The lattice parameters are a=b=0.387 80(0), 0.387 67(0) nm, c=1.166 00(2), 1.165 20 (2) nm. In the Pr123 structure, Ba ions could be replaced by Pr ions, but could not be replaced by Ca ions. Ca ions partially occupy the sites of Pr ions. The ionic radius plays a more important role than the chemical properties in the mutual substitution of Pr, Ba and Ca ions in the Pr123 structure of the Pr1-xBa2-yCax+yCu3O7. The highest content of Ca ions in the Pr1-xBa2-yCax+yCu3O7 system is x=0, y=0.4 under 950 ℃ in air.

     

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