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Structural and superconducting properties of (Y,Pr)2Ba4Cu7O15-δ prepared by using high-pressure techniques

✍ Scribed by Fu-Guo Tarntair; Teng-Ming Chen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
136 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

The stability of phases in the (Y1_xPrx)2Ba4Cu7Ois_6 (Pr-doped 247) system with x= 0 to 1.0 was investigated. The samples in the Pr-doped 247 series were prepared at 99@C under 20-24 bar of oxygen atmosphere, followed by long time annealing at 30(PC under 120 bar of oxygen pressure. Nearly single-phase samples were obtained only for x <0.6-0.7 based on X-ray diffraction data. The lattice parameters of the Prdoped 247 samples increased monotonically with increasing x due to the larger size of Pr. The superconducting transition temperature (Tc) of Pr-doped 247 samples determined from resistive measurements and field-cooled magnetization was found to be in good agreement and decreased from 88 (x= 0) to 21K (x = 0.6) with increasing x.

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