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

La 0.7 K x Ca 0.3 - x MnO 3 ( 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 La 0.7 Ca 0.3 MnO 3 , Mn–O–Mn bond angle slightly increases...

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Veröffentlicht in:Journal of materials science. Materials in electronics 2020-05, Vol.31 (9), p.6875-6882
Hauptverfasser: Tekgül, Atakan, Ünlü, Cumhur Gökhan, Sarlar, Kagan, Kucuk, Ilker
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Sprache:eng
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Zusammenfassung:La 0.7 K x Ca 0.3 - x MnO 3 ( 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 La 0.7 Ca 0.3 MnO 3 , 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 La 0.7 Ca 0.3 MnO 3 . 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 La 0.7 K 0.05 Ca 0.25 MnO 3 . The relative cooling powers (RCPs) in the La 0.7 K x Ca 0.3 - x MnO 3 ( x = 0 , 0.05, 0.1) samples were calculated to be 103, 133 and 88 J kg - 1 , respectively.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-03249-2