EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO3 DOPED Y-Ba-Cu-O SYSTEM

doi:10.1088/1004-423X/6/8/007

中国物理B ›› 1997, Vol. 6 ›› Issue (8): 614-618.doi: 10.1088/1004-423X/6/8/007

EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM

石磊¹, 庞文华¹, 李晓光¹, 周贵恩¹, 张裕恒², 冯勇³, 杜社军³, 周廉³

(1)Laboratory of Structure Analysis Research, University of Science and Technology of China, Academia Sinica, Hefei 230026,China; (2)Laboratory of Structure Analysis Research, University of Science and Technology of China, Academia Sinica, Hefei 230026,China; CCAST,World Laboratory, Beijing 100080,China; (3)Northwest Institute for Nonferrous Metal Research, Baoji 721014,China

收稿日期:1997-02-05 出版日期:1997-08-20 发布日期:1997-08-20
基金资助:
Project supported by the Youth Science Foundation of the University of Science and Technology of China, the National Ceter for Research and Development on Superconductivity, and the National Natural Science Foundation of China.

EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM

SHI LEI (石磊)^a, FENG YONG (冯勇)^b, PANG WEN-HUA (庞文华)^a, DU SHE-JUN (杜社军)^b, ZHOU LIAN (周廉)^b, LI XIAO-GUANG (李晓光)^a, ZHOU GUI-EN (周贵恩)^a, ZHANG YU-HENG^ac

^a Laboratory of Structure Analysis Research, University of Science and Technology of China, Academia Sinica, Hefei 230026,China; ^b Northwest Institute for Nonferrous Metal Research, Baoji 721014,China; ^c CCAST,World Laboratory, Beijing 100080,China

Received:1997-02-05 Online:1997-08-20 Published:1997-08-20
Supported by:
Project supported by the Youth Science Foundation of the University of Science and Technology of China, the National Ceter for Research and Development on Superconductivity, and the National Natural Science Foundation of China.

摘要/Abstract

摘要： Undoped and WO₃-doped Y-Ba-Cu-O ceramics have been slowly cooled in flowing oxygen or quenched in air from 900℃ to room temperature, after sintering at 900℃ for 3Oh in flowing oxygen. The ac susceptibility measurements show that the T_c of the quenched WO₃-doped Y-Ba-Gu-O superconductor can reach 88K, while the undoped Y-Ba-Cu-O ceramic quenched in air is a non-superconductor. X-ray diffraction data show that WO₃ does not enter into the YBa₂Cu₃O_7-x lattice but forms all impurity phase. The WO₃-doped YBCO specimens quenched in air consist of orthorhombic YBa₂Cu₃O_7-x phase and an impurity phase which increases with increasing WO₃ content. Raman spectra chow that oxygen contents are different for undoped and WO₃-doped samples. It la suggested that suitable doping with WO₃ can change the oxygen content and reduce the effect of thermal treatments on the superconductivity of Y-Ba-Cu-O system.

Abstract: Undoped and WO₃-doped Y-Ba-Cu-O ceramics have been slowly cooled in flowing oxygen or quenched in air from 900℃ to room temperature, after sintering at 900℃ for 3Oh in flowing oxygen. The ac susceptibility measurements show that the T_c of the quenched WO₃-doped Y-Ba-Gu-O superconductor can reach 88K, while the undoped Y-Ba-Cu-O ceramic quenched in air is a non-superconductor. X-ray diffraction data show that WO₃ does not enter into the YBa₂Cu₃O_7-x lattice but forms all impurity phase. The WO₃-doped YBCO specimens quenched in air consist of orthorhombic YBa₂Cu₃O_7-x phase and an impurity phase which increases with increasing WO₃ content. Raman spectra chow that oxygen contents are different for undoped and WO₃-doped samples. It la suggested that suitable doping with WO₃ can change the oxygen content and reduce the effect of thermal treatments on the superconductivity of Y-Ba-Cu-O system.

中图分类号: (Other heat and thermomechanical treatments)

81.40.Gh

81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation) 74.25.Gz (Optical properties) 78.30.Hv (Other nonmetallic inorganics) 74.62.Dh (Effects of crystal defects, doping and substitution)

石磊, 冯勇, 庞文华, 杜社军, 周廉, 李晓光, 周贵恩, 张裕恒. EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM[J]. 中国物理B, 1997, 6(8): 614-618.

SHI LEI (石磊), FENG YONG (冯勇), PANG WEN-HUA (庞文华), DU SHE-JUN (杜社军), ZHOU LIAN (周廉), LI XIAO-GUANG (李晓光), ZHOU GUI-EN (周贵恩), ZHANG YU-HENG (张裕恒). EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM[J]. Acta Physica Sinica (Overseas Edition), 1997, 6(8): 614-618.

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EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM

EFFECT OF THERMAL TREATMENTS ON THE SUPERCONDUCTIVITY OF UNDOPED AND WO₃ DOPED Y-Ba-Cu-O SYSTEM

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