期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 30, 期 12, 页码 2617-2624出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2010.04.032
关键词
X-ray methods; Chemical properties; Magnetic properties; Dielectric properties. E. Thermistors
资金
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires (CC)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Universidad Nacional del Sur (UNS) in Argentina
- Ministerio de Ciencia e Innovacion (MINCINN) in Spain [MAT 2004-03070-CO5-05, MAT 2007-31034]
In this paper we present the structural, magnetic and dielectric properties of ceramic nickel manganite NiMn2O4+delta produced by using nickel permanganate Ni(MnO4)(2)xH(2)O as a precursor. We have characterized the NiMn2O4+delta stoichiometry using quantitative energy-dispersive analysis of X-rays and thermal gravimetry under reducing conditions. Increased oxygen and Mn4+ contents were detected. X-ray diffraction and Rietveld refinement of X-ray data were carried out. Temperature dependent magnetization measurements were performed and the fern-magnetic transition was identified at approximate to 100 K. The fern-magnetic moment was found to be approximate to 1 mu(B) and hysteretic magnetization vs applied field curves were obtained. Dielectric properties were measured using impedance spectroscopy. Two dielectric relaxation processes were detected, which were associated with grain boundary and bulk contributions. The Arrhenius plots of resistivity and the temperature dependent dielectric permittivity were obtained for the two relaxations by means of an equivalent circuit model based on a series of two parallel RC elements. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据