|
authors |
Amaral, JS; Reis, MS; Araujo, JP; Mendonaca, TM; Tavares, PB; Amaral, VS; Vieira, JM |
|
editors |
Marques, AT; Silva, AF; Baptista, APM; Sa, C; Alves, FJLA; Malheiros, LF; Vieira, M |
|
nationality |
International |
|
journal |
ADVANCED MATERIALS FORUM IV |
|
author keywords |
Manganites; Phase Transitions; Magnetocaloric Effect; Magnetic Refrigeration |
|
keywords |
LA-SR MANGANITES; ER |
|
abstract |
Manganites of general formula ABMnO(3) (where A is a trivalent rare-earth ion and B is a divalent dopant) have interesting properties, namely colossal magnetoresistance and their applicability as materials for active magnetic regenerators. La0.70Sr0.30MnO3 (LSMO) is a ferromagnet presenting considerable magnetocaloric effect, with operating temperature T-C similar to 370 K and magnetic entropy variation comparable to pure Gadolinium. The high value of T-C makes LSMO unsuitable for room-temperature magnetic refrigeration applications, but by substituting. La With the high-magnetic moment ion Er, T-C is lowered and total magnetic entropy increases. We have found a limit of solid solubility of Er ions in LSMO, in samples prepared by either solid state or sot-gel techniques in previous works [1]. in accordance with other authors [2]. We now present a more detailed study of this limit of solubility. with more samples prepared with Er substitution close to the solubility limit and SEM microscopy clearly showing the changes in microstructure caused by the formation of a secondary ErMnO3 phase, in accordance with x-ray diffraction data and T-C variation along the series. The magnetocaloric properties of the series are also presented, showing the increase of Relative Cooling Power along the series, in applied magnetic fields up to 1 T. |
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publisher |
TRANS TECH PUBLICATIONS LTD |
|
issn |
0255-5476 |
|
year published |
2008 |
|
volume |
587-588 |
|
beginning page |
338 |
|
ending page |
+ |
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web of science category |
Engineering, Multidisciplinary; Materials Science, Multidisciplinary |
|
subject category |
Engineering; Materials Science |
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unique article identifier |
WOS:000259898200068
|
