THALLIUM NONSTOICHIOMETRY IN 2212-THALLIUM CUPRATE

被引：20

作者：

MICHEL, C ^{[1
]}

MARTIN, C ^{[1
]}

HERVIEU, M ^{[1
]}

MAIGNAN, A ^{[1
]}

PROVOST, J ^{[1
]}

HUVE, M ^{[1
]}

RAVEAU, B ^{[1
]}

机构：

[1] LAB CRISMAT,ISMRA,BD MARECHAL JUIN,F-14050 CAEN,FRANCE

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1992年 / 96卷 / 02期

关键词：

D O I：

10.1016/S0022-4596(05)80260-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The study of thallium nonstoichiometry in the thallium 2212 cuprate by X-ray diffraction and electron microscopy has allowed a significant homogeneity range to be isolated. Tl2−xBa2CaCu2O8±δ with 0≤x<0.4. The HREM study showed that thallium deficiency is not accomodated through an intergrowth mechanism but implies a statistical distribution of Tl atoms and vacancies in the thallium double layers. However, it appeared that modulated areas can arise from ions' and vacancies' local orderings in the (111) plane of the rock salt layers; they result in satellites in the E.D. patterns. The study of the superconducting properties of these oxides shows that the critical temperature is not greatly affected by the thallium nonstoichiometry, whereas hydrogen-argon annealings confirm the predominant role of oxygen non stoichiometry upon Tc's, allowing a (Tc)R=0 of 120 K to be reached for x=0.4. The deterioration of the grain boundaries by hydrogen annealing is also studied. © 1992, Academic Press, Inc.. All rights reserved.

引用

页码：271 / 286

页数：16

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