F. Tao, X. J. Zhou, Y. Z. Hao, G. C. Che, S. F. Zhu, Z. X. Zhao: Phase Formation, Crystal Structure and Electrical Properties of La212 Type Compound Substituted by Silver or Praseodymium

Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 43 - Abstract -

F. Tao, X. J. Zhou**, Y. Z. Hao***, G. C. Che*, S. F. Zhu, Z. X. Zhao*

Department of Materials Science, Sichuan University, Chengdu, P.R.China
*Chinese Academy of Science, Beijing, P.R.China
**Beijing Institute of Technology, Beijing, P.R.China
***School of Sciences, Yuzhou University, Chongqing, P.R.China

Phase Formation, Crystal Structure and Electrical Properties of La212 Type Compound Substituted by Silver or Praseodymium

The La212 type compounds substituted by silver or praseodymium are prepared by solid state reaction method. It is found that compounds La_2-xSr_xCa_0.5Pr_0.5Cu₂O₆, La_1.6Pr_0.4Ca_1-xSr_xCu₂O₆ and La_2-xPr_xCa_0.5Sr_0.5Cu₂O₆ can be formed for x=0.4-1.1, 0-0.5 and 0-1.5, respectively. A new member of La212 type compounds, La_2-xAg_xCaCu₂O₆ is also prepared. Their structures are verified by Rietveld structure refinement to belong to the structure type of La212 cuprate oxide with space group I4/mmm. Their electrical properties are investigated. La_1.65Ag_0.35CaCu₂O₆ displays metal-like behavior and its resistivity decreases with the decrease of temperature from 300K to 4.2K.

Keywords: phase formation, crystal structure, sliver, praseodymium

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