About the Morin transition in hematite in relation with particle size and aluminum substitution.

Vandenberghe, Robert Emile; San, E. Van; Grave, Eddy De; Costa, Geraldo Magela da

About the Morin transition in hematite in relation with particle size and aluminum substitution.

Date

2001

Authors

Vandenberghe, Robert Emile

San, E. Van

Grave, Eddy De

Costa, Geraldo Magela da

Abstract

The results of a MSssbauer study of the Morin transition behaviour in three series of hematite and Al-hematite samples are reviewed and discussed. The first two series comprise small-particle hematites and Al-hematites prepared from decomposition of lepidocrocite, whereas in the third series Al-hematites up to the #m range are obtained from co-precipitated oxinates. It is demonstrated that the Morin transition temperature follows quite well the overall properties of the samples such as particle size and Al substitution, while the transition region is rather determined by all kind of distributive effects. A model involving intermediate states is suggested for the Morin transition behaviour in non-ideal hematite.

Citation

VANDENBERGUE, R. E. et al. About the Morin transition in hematite in relation with particle size and aluminum substitution. Czechoslovak Journal of Physics, v. 51, p. 663-675, 2001. Disponível em: <https://link.springer.com/article/10.1023/A:1017697715646>. Acesso em: 20 abr. 2017.