Magnetic properties of A- and B-site cation doped La0.65Ca0.35MnO3 manganites

被引：27

作者：

Samancioglu, Y. ^{[1
]}

Coskun, A. ^{[1
]}

机构：

[1] Mugla Univ, Dept Phys, Fac Sci & Letters, TR-48000 Kotekli, Mugla, Turkey

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 507卷 / 02期

关键词：

Composite materials; Sol-gel processes; Magnetocaloric effect; Magnetic measurements; MAGNETOCALORIC PROPERTIES; ENTROPY CHANGE; LA0.7CA0.3MNO3;

D O I：

10.1016/j.jallcom.2010.07.212

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 La0.65Ca0.35MnO3, La0.65Ca0.30Pb0.05MnO3 and La0.65Ca0.30Pb0.05Mn0.9Cu0.1O3 compounds, prepared by the sol-gel method and sintered in air at 1100 degrees C for 24 h, have been investigated by Magnetic Properties Measurements System (MPMS) to explore the effects of A- and B-site cation doping. From the measurements, the Curie temperatures (T-C) and the isothermal magnetic entropy changes (-Delta S-M) were determined. The Curie temperature of La(0.6)5Ca(0.35)MnO(3) compound was found to be 273 K. The Curie temperature increases to 286 K for the La0.65Ca0.30Pb0.05MnO3 compound due to the substitution of Ca by a small amount of Pb. However, replacing 10% of Mn with Cu (La0.65Ca0.30Pb0.05Mn0.9Cu0.1O3) leads to a reduction in the Curie temperature to 223K. For the field change of 1 T, while the maximum magnetic entropy change for the sample La0.65Ca0.35MnO3 was found to be 4.1 J/kg K it decreases down to 2.6 J/kg K and 3.2 J/kg K for the La0.65Ca0.30Pb0.05MnO3 and La0.65Ca0.30Pb0.55Mn0.9Cu0.1O3 samples, respectively. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：380 / 385

页数：6

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