Vandenberghe, Robert EmileSan, E. VanGrave, Eddy DeCosta, Geraldo Magela da2017-05-302017-05-302001VANDENBERGUE, 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. 2017.1572-9486http://www.repositorio.ufop.br/handle/123456789/7817The 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.en-USrestritoArtigo publicado em periodicohttps://link.springer.com/article/10.1023/A:1017697715646https://doi.org/10.1023/A:1017697715646