K dopant effect on La0.7KxCa0.3-xMnO3 (x=0, 0.05, 0.1) perovskite compounds: the structural, magnetic and magnetocaloric properties

被引：0
|
作者：
Tekgul, Atakan [1 ]
Unlu, Cumhur Gokhan [2 ]
Sarlar, Kagan [1 ,3 ]
Kucuk, Ilker [1 ]
机构：
[1] Uludag Univ, Fac Arts & Sci, Phys Dept, TR-16059 Bursa, Turkey
[2] Pamukkale Univ, Dept BioMed Engn, TR-20070 Denizli, Turkey
[3] Karamanoglu Mehmetbey Univ, Kamil Ozdag Sci Fac, Phys Dept, TR-70100 Karaman, Turkey
来源：
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2020年 / 31卷 / 09期
关键词：
ENTROPY CHANGE; FE;
D O I：
10.1007/s10854-020-03249-2
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：
La0.7KxCa0.3-xMnO3 (x = 0, 0.05, 0.1) perovskites were prepared by sol-gel method. The K-doped effect was determined by the structural, magnetic, and magnetocaloric properties of the compounds. In the crystal structure of K-doped La0.7Ca0.3MnO3, Mn-O-Mn bond angle slightly increases with K addition. The transition shifts the range of 270-320 K when the K is added in La0.7Ca0.3MnO3. The Curie temperature increases from 251 to 288 K with increasing K amount. The maximum magnetic entropy change was found to be 2.7 J kg(-1) K-1 at 283 K under a magnetic field change of 2 T for the La0.7K0.05Ca0.25MnO3. The relative cooling powers (RCPs) in the La0.7KxCa0.3-xMnO3 (x = 0, 0.05, 0.1) samples were calculated to be 103, 133 and 88 J kg(-1), respectively.
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收藏
页码：6875 / 6882
页数：8
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