Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films

被引：8
|
作者：
Zhang, H. [1 ]
Gauquelin, N. [2 ,5 ]
McMahon, C. [3 ]
Hawthorn, D. G. [3 ,4 ]
Botton, G. A. [2 ]
Wei, J. Y. T. [1 ,4 ]
机构：
[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
[2] McMaster Univ, Dept Mat Sci & Engn, 1280 Main St West, Hamilton, ON L8S 4L7, Canada
[3] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
[4] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada
[5] Univ Antwerp, Dept Phys, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
来源：
PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 03期
基金：
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词：
HIGH-TEMPERATURE SUPERCONDUCTORS; RAY-ABSORPTION SPECTROSCOPY; STRUCTURAL DEFECTS; OXYGEN-PRESSURE; YBA2CU4O8; CRYSTAL; Y2BA4CU7O15-DELTA; YBA2CU3O7-DELTA; SYSTEM; LA2-XSRXCUO4;
D O I：
10.1103/PhysRevMaterials.2.033803
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It is known that solid-state reaction in high-pressure oxygen can stabilize high-oxidation phases of Y-Ba-Cu-O superconductors in powder form. We extend this superoxygenation concept of synthesis to thin films which, due to their large surface-to-volume ratio, are more reactive thermodynamically. Epitaxial thin films of YBa2Cu3O7-delta grown by pulsed laser deposition are annealed at up to 700 atm O-2 and 900 degrees C, in conjunction with Cu enrichment by solid-state diffusion. The films show the clear formation of Y2Ba4Cu7O15-delta and Y2Ba4Cu8O16 as well as regions of YBa2Cu5O9-delta and YBa2Cu6O10-delta phases, according to scanning transmission electron microscopy, x-ray diffraction, and x-ray absorption spectroscopy. Similarly annealed YBa2Cu3O7-delta powders show no phase conversion. Our results demonstrate a route of synthesis towards discovering more complex phases of cuprates and other superconducting oxides.
引用
收藏
页数：6
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