Title of article :
Ca-site substitution induced a metal–insulator transition in manganite CaMnO3
Author/Authors :
D. Sousa، نويسنده , , M.R. Nunes، نويسنده , , Diosely C. Silveira، نويسنده , , I. Matos، نويسنده , , A.B. Lopes، نويسنده , , M.E. Melo Jorge، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Pages :
9
From page :
311
To page :
319
Abstract :
A systematic study of the A-site doping in Mn(IV)-rich perovskite manganites Ca1−xHoxMnO3, over a large homogeneity range (0.1 ≤ x ≤ 0.4), has been performed. A significant increase in the lattice parameters indicated the presence of mixed valence state of Mn: Mn3+ and Mn4+. The substitution of calcium by holmium also induces strong changes in the electrical properties. We found that small Ho concentration produces an important decrease in the electrical resistivity and induces an electrical transition, the temperature corresponding to the metal–insulator transition (TMI) shifts with the holmium content. This electrical behavior is attributed to the Mn3+ ions content and a charge order effect.
Keywords :
X-ray diffraction , electron microscopy , Electrical conductivity , Ceramics
Journal title :
Materials Chemistry and Physics
Serial Year :
2008
Journal title :
Materials Chemistry and Physics
Record number :
1065994
Link To Document :
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