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 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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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 |