Phase diagram studies in the SrO-Cr2O3-La2O3 system in air and under low oxygen pressure

被引：38

作者：

Peck, DH ^{[1
]}

Miller, M ^{[1
]}

Hilpert, K ^{[1
]}

机构：

[1] Forschungszentrum Julich, Res Ctr, Inst Mat & Proc Energy Syst, D-52425 Julich, Germany

来源：

SOLID STATE IONICS | 1999年 / 123卷 / 1-4期

关键词：

SrO-Cr2O3-La2O3; system; phase diagram; strontium doped lanthanum chromate; perovskite; Ruddlesden-Popper phases;

D O I：

10.1016/S0167-2738(99)00088-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phase equilibria were determined in the complete composition range of the SrO-Cr2O3-La2O3 system in air at 1223 K and under low oxygen pressure (high vacuum, p(O-2) approximate to 10(-9) bar). The (La,Sr)CrO3 perovskite phase is the only quasi ternary oxide phase stable in air. The quasi ternary Ruddlesden-Popper phases (La,Sr)(n+1)CrnO3n+1 (n = 1,2,3) were identified in addition to the perovskite phase in the samples annealed under low oxygen pressure. The solubility limit of strontium in the La1-xSrxCrO3 phase was determined at 1223 K as x = 0.10+/-0.02 in air and at 1873 K as x = 0.31+/-0.02 under low oxygen pressure. The crystal lattice parameters of the Ruddlesden-Popper phase LaSrCrO4 were obtained by the analysis of XRD patterns. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：59 / 65

页数：7

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