The spike in the relation between entropy change and temperature in LaFe11.83Si1.17 compound

Hong wei Zhang; Jun Shen; Qiao yan Dong; Tong yun Zhao; Yang xian Li; Ji rong Sun; Bao gen Shen

doi:10.1016/j.jmmm.2008.02.128

The spike in the relation between entropy change and temperature in LaFe_11.83Si_1.17 compound

Hong wei Zhang^*, Jun Shen, Qiao yan Dong, Tong yun Zhao, Yang xian Li, Ji rong Sun, Bao gen Shen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

LaFe_11.83Si_1.17 compound shows a first-order transition from paramagnetic to ferromagnetic state. When measurement is carried out from low to high temperature in an increasing field, there is a spike of 51 J/kg K at 174.8 K, followed by a plateau of 20 J/kg K in the curve of entropy change versus temperature determined by the Maxwell relation. However, the nature of the spike is fictitious, which is caused by an obvious superheat of the ferromagnetic state when the Maxwell relation or the Clausius-Clapeyron equation is used to evaluate the entropy change.

Original language	English
Pages (from-to)	1879-1883
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	320
Issue number	13
DOIs	https://doi.org/10.1016/j.jmmm.2008.02.128
Publication status	Published - Jul 2008
Externally published	Yes

Keywords

Magnetic entropy change
Magnetic first-order transition
Maxwell relations

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10.1016/j.jmmm.2008.02.128

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title = "The spike in the relation between entropy change and temperature in LaFe11.83Si1.17 compound",

abstract = "LaFe11.83Si1.17 compound shows a first-order transition from paramagnetic to ferromagnetic state. When measurement is carried out from low to high temperature in an increasing field, there is a spike of 51 J/kg K at 174.8 K, followed by a plateau of 20 J/kg K in the curve of entropy change versus temperature determined by the Maxwell relation. However, the nature of the spike is fictitious, which is caused by an obvious superheat of the ferromagnetic state when the Maxwell relation or the Clausius-Clapeyron equation is used to evaluate the entropy change.",

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T1 - The spike in the relation between entropy change and temperature in LaFe11.83Si1.17 compound

AU - Zhang, Hong wei

AU - Shen, Jun

AU - Dong, Qiao yan

AU - Zhao, Tong yun

AU - Li, Yang xian

AU - Sun, Ji rong

AU - Shen, Bao gen

PY - 2008/7

Y1 - 2008/7

N2 - LaFe11.83Si1.17 compound shows a first-order transition from paramagnetic to ferromagnetic state. When measurement is carried out from low to high temperature in an increasing field, there is a spike of 51 J/kg K at 174.8 K, followed by a plateau of 20 J/kg K in the curve of entropy change versus temperature determined by the Maxwell relation. However, the nature of the spike is fictitious, which is caused by an obvious superheat of the ferromagnetic state when the Maxwell relation or the Clausius-Clapeyron equation is used to evaluate the entropy change.

AB - LaFe11.83Si1.17 compound shows a first-order transition from paramagnetic to ferromagnetic state. When measurement is carried out from low to high temperature in an increasing field, there is a spike of 51 J/kg K at 174.8 K, followed by a plateau of 20 J/kg K in the curve of entropy change versus temperature determined by the Maxwell relation. However, the nature of the spike is fictitious, which is caused by an obvious superheat of the ferromagnetic state when the Maxwell relation or the Clausius-Clapeyron equation is used to evaluate the entropy change.

KW - Magnetic entropy change

KW - Magnetic first-order transition

KW - Maxwell relations

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SN - 0304-8853

VL - 320

SP - 1879

EP - 1883

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 13

ER -

The spike in the relation between entropy change and temperature in LaFe_11.83Si_1.17 compound

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Keywords

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