Entropy change and entropy production in BaFe12O19 barium ferrite

被引：3

作者：

Basso, Vittorio ^{[1
]}

Kuepferling, Michaela ^{[1
]}

Sasso, Carlo Paolo ^{[1
]}

LoBue, Martino ^{[2
]}

机构：

[1] Ist Nazl Ric Metrol, I-10135 Turin, Italy

[2] UniverSud, CNRS, SATIE, ENS Cachan, F-94230 Cachan, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2010年 / 322卷 / 9-12期

关键词：

Barium ferrite; Magneto-caloric;

D O I：

10.1016/j.jmmm.2009.09.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper we discuss measurements of the heat exchanged along the hysteresis loop and there turn branches of barium ferrite of composition BaFe12O19. The measurements show the joint presence of a dissipated heat, connected with the hysteresis losses, and an entropy change, connected with the ordering effect of the magnetic field on the system of magnetic spins. We demonstrate that when we try to separate the two contributions we have to conclude that the entropy cannot be a single-valued function of the magnetic field. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1585 / 1588

页数：4

共 7 条

[1] A Peltier cell calorimeter for the direct measurement of the isothermal entropy change in magnetic materials [J].