Determination of the Mn3+/Mn4+ ratio in La1-xSrxMnO3±d powders

被引：9

作者：

Siqueira, Guilherme Oliveira ^{[1
]}

Belardi, Rose Marie ^{[1
]}

Almeida, Pedro Hespanha ^{[1
]}

da Silva, Charles Luis ^{[1
]}

Brant, Marcia Caldeira ^{[1
]}

Matencio, Tulio ^{[1
]}

Domingues, Rosana Zacarias ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Quim, ICEx, BR-3127090 Belo Horizonte, MG, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 521卷

关键词：

Electrode materials; Chemical synthesis; Powder metallurgy; X-ray diffraction; Electronic transport; OXIDATIVE NONSTOICHIOMETRY; IMPEDANCE SPECTROSCOPY; OXYGEN-STOICHIOMETRY; CATALYTIC-PROPERTIES; LANTHANUM MANGANITE; MAGNETIC-PROPERTIES; DEFECT STRUCTURE; OXIDE; MAGNETORESISTANCE; REDUCTION;

D O I：

10.1016/j.jallcom.2012.01.023

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：

The present work combines the results of two simple methods of determination of the Mn3+/Mn4+ ratio for La1-xSrxMnO3 +/- d powders, prepared by citrate route, in which the Sr content, x, varies from 0.16 to 0.40. The ratio Mn3+/Mn4+ was successfully estimated combining the results of Temperature Programmed Reduction (TPR) analysis and redox titration. Moreover, the possible perovskite chemical formulas were established and a direct relationship between the Sr content and the Mn4+ amount was found. Morphological analyses such as grain size and surface area are also presented to better characterize the powders. Gas adsorption by Brunauer-Emmett-Teller method (BET) and scanning electron microscopy (SEM) were used to evaluate the agglomeration degree of powders and showed the inhibitory influence of Sr content on the growth of crystallites. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：50 / 54

页数：5

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