Determination of manganese valence in complex La-Mn perovskites

被引：44

作者：

Licci, F

Turilli, G

Ferro, P

机构：

[1] MASPEC Institute of CNR, 43100 Parma

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1996年 / 164卷 / 03期

关键词：

La-Mn perovskites; mixed-valent manganites; iodometric titrations; manganese valence determination; electrochemical analysis;

D O I：

10.1016/S0304-8853(96)00623-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We describe a chemical method for determining the manganese concentration and average oxidation state in mixed-valence compounds, and in particular in complex La-Mn perovskites. The method is based on two independent iodometric titrations, with amperometric dead-stop end-point detection. The oxygen stoichiometry and the molecular weight of the compounds can also be evaluated if secondary phases or multi-valent elements different from manganese are not present. The method was applied to the analysis of La-Mn perovskites with the same cation stoichiometry but synthesized under different conditions. Significant variations of the Mn average valence were measured, which corresponded to different physical and structural properties of the materials.

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页码：L268 / L272

页数：5

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