Enhancement of the magnetic and magnetocaloric properties by Na substitution for Ca of La0.8Ca0.2MnO3 manganite prepared via the Pechini-type sol-gel process

被引:47
作者
Choura-Maatar, S. [1 ]
Nofal, Muaffaq M. [2 ]
M'nassri, R. [3 ]
Cheikhrouhou-Koubaa, W. [1 ]
Chniba-Boudjada, N. [4 ]
Cheikhrouhou, A. [1 ]
机构
[1] Sfax Technopark, Digital Res Ctr Sfax, LT2S Lab LR16 CRNS 01, Cite El Ons,BP 275, Sfax 3021, Tunisia
[2] Prince Sultan Univ, Dept Math & Gen Sci, POB 66833, Riyadh 11586, Saudi Arabia
[3] Kairouan Univ, Inst Superieur Sci Appliquees & Technol Kasserine, URMAN, BP 471, Kasserine 1200, Tunisia
[4] Univ Grenoble Alpes, CNRS, Inst Neel, BP 166, F-38042 Grenoble 9, France
关键词
ROOM-TEMPERATURE; REFRIGERANT CAPACITY; TRANSPORT-PROPERTIES; CRITICAL-BEHAVIOR; ENTROPY CHANGE; TRANSITION; STATE; EFFICIENCY;
D O I
10.1007/s10854-019-02680-4
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report in this work the results of synthesis and characterization of La0.8Ca0.2-xNaxMnO3 (0 <= x <= 0.2) prepared by the Pechini sol-gel method. We have investigated different effects of replacing Ca by Na on the magnetic properties and magnetocaloric effect of La0.8Ca0.2MnO3 compounds using X-ray diffraction and magnetization measurements. We have observed an evolution from an orthorhombic to a rhombohedral symmetry caused by the addition of Na and that the rhombohedral phase is stable for x >= 0.1. The partial substitution of Ca by Na leads to a monotonic increase in the Curie temperature (T-C) of the samples from 105 K for x = 0 to 330 K for x = 0.2. A second-order nature of the magnetic phase transition is established in all the prepared compounds with the help of the Banerjee criterion. At an applied field of 5T, the maximum magnetic entropy change ( increment SMmax) shows an enhancement with increasing Na+ concentration. Moreover, the relative cooling power (RCP) values are found to vary between 203 and 300.5 J/kg in this series of materials. In order to compare the magnetocaloric performances of the prepared samples, we have used several figures of merit such as the temperature-averaged entropy change (TEC), refrigerant capacity (RC) and normalized refrigerant capacity (NRC). Accordingly, the addition of Na ion greatly increases TEC, RC and NRC and thereby improves the magnetocaloric performance in La0.8Ca0.2-xNaxMnO3 (0 <= x <= 0.2). These metrics can help in identifying materials with high performance and clearly suggest that the sol-gel-made samples with x >= 0.1 can be customized for use in magnetic cooling applications near room temperature.
引用
收藏
页码:1634 / 1645
页数:12
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