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Revista de Chimie (Rev. Chim.), Year 2008, Volume 59, Issue 11,

https://doi.org/10.37358/RC.08.11.2001

Emil Burzo, Istvan Balasz, Mihaela Albu

Crystal Structures, Magnetic and Electrical Properties of Manganese Perovskites

Abstract:

The Y0.67Ca0.33Mn1-yAlyO3 system with y £ 0.2, crystallizes in an orthorhombic type structure having Pnma space group. The La1-xPbxMnO3 perovskites with 0.24 £ x 0.40 have a rhombohedral structure of R 3c-type. The Y0.67Ca0.33Mn1-yAlyO3 samples show a mictomagnetic type behaviour. The analysis of charge compensation mechanism suggests that the number of oxygen vacancies increases with Al content. A semiconducting type behaviour was also shown. The contributions of double exchange mechanism to magnetic ordering in La1-xPbxMnO3 increase as the lead content is higher. A nearly ferromagnetic type ordering was shown for the sample with x=0.4. The number of Mn4+ ions fits well with the Pb2+ ones, suggesting that the change in Mn valence state is the dominant mechanism for charge compensation. A transition from metallic to semiconducting type behaviour is shown at temperatures by@130 K lower than the Curie points. Magnetoresistivities up to @ 50 % were determined in fields of 60-70 kOe.

Keywords:
perovskites; crystal structure; magnetic and electronic properties

Issue: 2008, Volume 59, Issue 11
Pages:
Publication date: 2008/10/9
https://doi.org/10.37358/RC.08.11.2001
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