Synthesis, structural, magnetic and electrical properties of nominal La0.67Ba0.33-xNaxMnO3 (0 ≤ x ≤ 0.33) manganites

被引：8

作者：

Hcini, S. ^{[1
]}

Zemni, S. ^{[1
]}

Boudard, M. ^{[2
]}

Rahmouni, H. ^{[3
]}

Oumezzine, M. ^{[1
]}

机构：

[1] Univ Monastir, Fac Sci Monastir, Dept Phys, Lab Physicochim Mat, Tunis 5019, Tunisia

[2] Minatec, CNRS, UMR 5628, Lab Mat & Genie Phys, F-38016 Grenoble 1, France

[3] Univ Gabes, Fac Sci Gabes, Lab Phys Mat & Nanomat Appl Environm, Gabes 6079, Tunisia

来源：

EMM-FM2011 - FIRST EURO MEDITERRANEAN MEETING ON FUNCTIONALIZED MATERIALS | 2012年 / 29卷

关键词：

OXYGEN STOICHIOMETRY; TRANSPORT-PROPERTIES; MAGNETORESISTANCE; TEMPERATURE; BEHAVIOR; NA;

D O I：

10.1051/epjconf/20122900022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Complete nominal solid solutions La0.67Ba0.33-xNaxMnO3 (0 <= x <= 0.33) have been elaborated by ceramic route at 1200 degrees C. ICPAES chemical analysis and XRD Rietveld structure refinement revealed that the nominal Na content is not achieved by our ceramic method. The chemical formula should be rather written as La alpha Ba beta Na lambda MnO3-delta with a significantly lower Na content (lambda), than the nominal one (x), and with a slight deficit (delta) in oxygen content, leading to the appearance of two minor secondary phases identified as Mn3O4 and Na0.55Mn2O4 center dot 1.5H(2)O. Magnetization and electrical resistance vs. temperature show paramagnetic/semiconductor - ferromagnetic/metallic transitions with only a slight decrease in magnetic and electrical transition temperatures when Na content increases. Such amount of this decrease is not expected according to the nominal Na content giving a significant difference between nominal and experimental Mn4+/Mn3+ ratios.

引用

页数：10

共 21 条

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