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In this study, a theoretical work on magnetocaloric properties of ceramic and sol–gel La0.67Ca0.33MnO3 samples was presented. The value of the magnetocaloric effect has been determined from theoretical work on magnetization as a function of temperature. It is showed that ceramic sample shows better magnetocaloric properties than the sol–gel one. Though the maximum magnetic entropy change ∆S M of ceramic sample upon 5 kOe applied field variation which is about 76 % of that of a pure Gd metal upon 5 kOe, ∆S M distribution of the La0.67Ca0.33MnO3 is much more uniform than that of Gd. This feature is desirable for an Ericson-cycle magnetic refrigerator.
| Authors: | Mahmoud Aly Hamad | |
| Journal: | Journal of Thermal Analysis and Calorimetry | |
| Year: | 2012 | |
| DOI: | 10.1007/s10973-012-2505-1 | |
| Publication date: | 26-06-2012 |
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Obituary Content Type Journal Article Pages 1-2 DOI 10.1007/s10973-012-2803-7 Authors Takayoshi Kimura, Department of Chemistry, Kinki University, Higashi-Osaka, Japan Nobuyoshi Koga, Graduate School of Education, Hiroshima University, Higashi-Hiroshima, Japan Jou ... more
Investigation of thermal decomposition kinetics of taurine
The non-isothermal thermal decomposition of taurine was investigated by means of thermogravimetric analysis (TG) and differential thermal analysis (DTA). The experimental data were treated using Flynn–Wall–Ozawa, Doyle, Kissinger, and Šatava–Šesták methods, respectively. The results show th ... more
Thermodynamic analysis of the hydrogen peroxide decomposition parameters
This paper discusses the estimation of the decomposition parameters of the liquid–gas-steam system, which is produced by the hydrogen peroxide decomposition at isobar conditions. The thermodynamic analysis calculates the two critical concentrations, which mark the phase transitions of the s ... more
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