標題: The high-pressure synthesis and characterization of some praseodymium-substituted rare-earth based R2Ba4Cu7O14+delta (R = Nd, Sm, Eu, Gd, Ho, Tm)
作者: Chen, TM
Lai, YL
Kao, FS
交大名義發表
應用化學系
National Chiao Tung University
Department of Applied Chemistry
公開日期: 1-Aug-1997
摘要: Samples of the (R1-xPrx)(2)Ba4Cu7O14+delta (R = Nd, Sm, Eu, Gd, Ho, Tm; Pr-doped R247) systems with x = 0 to 1.0 and with an increment of 0.1 in x was investigated. Single-phased samples were obtained with substitution limit equal to 0.4, 0.6, 0.5, 0.6, 0.8 and 0.5 for phases with R = Nd, Sm, Eu, Gd, Ho and Tm, respectively, as indicated by x-ray diffraction (XRD) data. T-c's of the Pr-doped R247 phases were found to be suppressed from 66, 69, 75, 70, 92 and 88K down to 41K (x=0.3), 20 K (x=0.4), 52K(x = 0.4), 18K (x = 0.5), 8K (x = 0.7) and 50K (x = 0.4) and the corresponding composition coefficients of T-c, dT(c)/dx, were found to be -41.3, -50.4, -28.0, -47.7, -53.0 and -46.0 K/Pr-atom per formula unit for Pr-doped R247 phases with R = Nd, Sm, Eu, Gd, Ho and Tm, respectively. The variation of T-c and dT(c)/dx coefficients ofthe Pr-doped R247 phases upon Pr doping are described and their implcations are discussed.
URI: http://hdl.handle.net/11536/394
ISSN: 0921-4534
期刊: PHYSICA C
Volume: 282
Issue: 
起始頁: 789
結束頁: 790
Appears in Collections:Conferences Paper


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