Structural, magnetic and transport properties of the negative magnetoresistive Pr1-xPbxMnO3-y alloys

被引：2
|
作者：
Yin, RZ [1 ]
Park, JW [1 ]
Choi, HN [1 ]
Oh, SK [1 ]
Yo, CH [1 ]
机构：
[1] Yonsei Univ, Dept Chem, Seoul 120749, South Korea
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2004年 / 86卷 / 01期
关键词：
Pr1-xPbxMnO3-y alloys; perovskite; magnetoresistance; magnetic properties; conductivity; X-ray absorption;
D O I：
10.1016/j.matchemphys.2004.02.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The nonstoichiometric perovskite Pr1-xPbxMnO3-y compounds have been synthesized by a standard combustion technique. The samples show uniphase solid solutions. The mixed valency of Mn ions was identified by X-ray absorption spectroscopy and the amount of Mn4+ ions was determined by the iodometric titration method. The nonstoichiometric chemical formulas of the Pr1-xPbxMn1-r3+Mnr4+O3-y compounds have been formulated. The Pr1-zPbxMnO3-y (x = 0.1, 0.2, and 0.3) compounds show a transition from the ferromagnetic state to the paramagnetic state. The transport properties have been studied by electrical conductivity measurements under magnetic fields of 0 G and 3 kG. The maenetoresistant ratio increased with decreasing Mn-O distance. The magnetoresistant ratio is negative for all the samples. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：137 / 143
页数：7
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