ISSN 2594-5327
64º Congresso Anual da ABM — vol. 64, num.64 (2009)
Título
Autoria
DOI
Downloads
Resumo
In the present work data for the heat capacity at constant pressure of the oxide Al2MnO4 were measured in the range between 2 K and 300 K. Two peaks were detected, one around 30 K, and the other around 6 K. The comparison with studies on similar materials suggested, that the observed phenomenon is magnetic in nature. By separate modeling of the vibrational and magnetic contributions it was possible to calculate the molar formation entropy at 298 K, which was equal to 117,3 ± 0,9 J/mol.K. This value is 10% higher than the accepted estimations from the literature. The authors believe that the difference must be associated with the magnetic entropy, whi
In the present work data for the heat capacity at constant pressure of the oxide Al2MnO4 were measured in the range between 2 K and 300 K. Two peaks were detected, one around 30 K, and the other around 6 K. The comparison with studies on similar materials suggested, that the observed phenomenon is magnetic in nature. By separate modeling of the vibrational and magnetic contributions it was possible to calculate the molar formation entropy at 298 K, which was equal to 117,3 ± 0,9 J/mol.K. This value is 10% higher than the accepted estimations from the literature. The authors believe that the difference must be associated with the magnetic entropy, which is a consequence of the observed anomalies in the heat capacity data.
Palavras-chave
Entropia magnética; Capacidade calorífica; Al2MnO4.
Magnetic entropy; Heat capacity; Al2MnO4.
Como citar
Siqueira, Rogério Navarro Correia de;
Avillez, Roberto Ribeiro de;
Gomes, Angelo Marcio de Souza.
AVALIAÇÃO TERMODINÂMICA DO SISTEMA Al2O3-MnO - PROPRIEDADES TERMODINÂMICAS DO ÓXIDO Al2MnO4
,
p. 1785-1791.
In: 64º Congresso Anual da ABM,
Belo Horizonte,
2009.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-14917
