A phase diagram of the Bi2Sr2CuO6-CaCuO2 system in relation to Bi-based superconductors

被引：26

作者：

Suzuki, T

Yumoto, K

Mamiya, M

Hasegawa, M

Takei, H

机构：

[1] Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 106, Japan

[2] Toyo Univ, Fac Engn, Kawagoe, Saitama 350, Japan

[3] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 560, Japan

来源：

PHYSICA C | 1998年 / 301卷 / 3-4期

关键词：

phase diagram; phase stability; superconductor;

D O I：

10.1016/S0921-4534(98)00053-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A pseudo-binary phase diagram of the Bi2Sr2CuO6 (Bi-2201)-CaCuO2 system between 850 and 1020 degrees C is prepared by a simultaneous use of a newly developed high-temperature X-ray powder diffraction apparatus with a rapid counting system and an optical microscope. The phase diagram is characterized as: (1) a complete liquid state exists above 911 degrees C between the compositions of Bi-2201 and Bi2S2CaCu2O8 (Bi-2212); (2) the incongruent melting point of Bi-2212 is 887 degrees C, which is the lowest in this system; (3) Bi-2212 changes into a mixture of (Sr,Ca)CuO2, Bi-2201 and liquid above this point with a very low transformation rate; and (4) a mixture of Bi-2212, Ca2CuO3 and few Bi2Sr2Ca2Cu3O10 (Bi-2223) having the nominally stoichiometric Bi-2223 composition melts partially at 896 degrees C and becomes (Sr,Ca)CuO2, (Sr,Ca)(2)CuO3 and liquid. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：173 / 184

页数：12

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