The phase conversion of precursor powders for powder melting process YBa2Cu3O7−x superconductors

• Published in: Journal of materials science. Materials in electronics Vol. 19; no. 11; pp. 1069 - 1072
• Main Authors: Jianqing, Feng, Yafeng, Lu, Lian, Zhou, Pingxiang, Zhang, Xiaoyan, Xu, Shaokai, Chen, Cuiping, Zhang, Xiaomei, Xiong, Guoqing, Liu
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-11-2008; Springer; Springer Nature B.V
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electronics; Exact sciences and technology; Materials; Materials Science; Melting; Optical and Electronic Materials; Y123 Phase; Peritectic Temperature; Precursor Powder; YBCO Superconductor; Phase Conversion; Process conditions; Quaternary compound; Barium oxide; Yttrium oxide; Copper oxide; X ray diffraction; Powder; High temperature superconductor
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-007-9468-1

The effects of heating rate and holding time on the formation of YBa
2
Cu
3
O
7−
x
phase in precursor powders for YBa
2
Cu
3
O
7−
x
superconducting bulks prepared by powder melting process have been investigated. The phase conversion of the precursor powders is studied by X-ray diffraction and found to be different for different heating rates during heating. The YBa
2
Cu
3
O
7−
x
phase is formed during heating to peritectic temperature at 100 and 400 °C/h, but not at 6,000 °C/h. The longer the holding time, the more the amount of YBa
2
Cu
3
O
7−
x
phase between 880 °C and about 950 °C. The results are useful for understanding the mechanism of powder melting process and controlling the process conditions.