Influence of the modifier on the short and long range disorder of stannate perovskites

被引：38

作者：

Alves, Mary C. F. ^{[1
]}

Souza, Soraia C. ^{[1
]}

Lima, Hebert H. S. ^{[1
]}

Nascimento, Marcelo R. ^{[1
,2
]}

Silva, Maria R. S. ^{[1
]}

Espinosa, Jose Waldo M. ^{[1
]}

Lima, Severino J. G. ^{[3
]}

Longo, E. ^{[4
]}

Pizani, P. S. ^{[5
]}

Soledade, Luiz E. B. ^{[1
]}

Souza, Antonio G. ^{[1
]}

Santos, Ieda M. G. ^{[1
]}

机构：

[1] Univ Fed Paraiba, CCEN, Dept Quim, LACOM, BR-58059900 Joao Pessoa, Paraiba, Brazil

[2] EAFS, PB, Sousa, PB, Brazil

[3] Univ Fed Paraiba, CT, Dept Engn Mecan, LSR, Joao Pessoa, Paraiba, Brazil

[4] UNESP, Inst Quim, LIEC, CMDMC, Araraquara, SP, Brazil

[5] Univ Fed Sao Carlos, Dept Fis, BR-13560 Sao Carlos, SP, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 476卷 / 1-2期

关键词：

Chemical synthesis; Crystal structure; Phase transitions; X-ray diffraction; Order-disorder effects; STRUCTURAL PHASE-TRANSITIONS; SRSNO3; PEROVSKITE; TEMPERATURE; CASNO3;

D O I：

10.1016/j.jallcom.2008.09.034

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：

Ca1-xSrxSnO3 powders (x = 0, 0.25,0.50,0.75 and 1) were synthesized by the polymeric precursor method. This method is derived from the Pechini one, being quite simple, yielding a high chemical homogeneity. This work aims at evaluating the influence of the modifier (Sr2+ and/or Ca2+) on the properties of stannates with perovskite structure. The powders were characterized by XRD, Raman and FTIR. The increase of the Sr2+ concentration in the Ca1-xSrxSnO3 system promotes a high short range organization between the polyhedra, diminishing the high degree of distortions of CaSnO3 orthorhombic perovskite. On the other hand, it was verified that the samples that with a higher concentration Of Ca2+ show a higher short range organization within the polyhedra (SnO6). As a consequence pure SrSnO3 presents higher long range order, crystallizing at lower temperature. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：507 / 512

页数：6

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