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J. Phys. IV France
Volume 11, Numéro PR10, Décembre 2001
Journées d'Étude des Équilibres entre Phases
Page(s) Pr10-109 - Pr10-113
Journées d'Étude des Équilibres entre Phases

J. Phys. IV France 11 (2001) Pr10-109-Pr10-113

DOI: 10.1051/jp4:20011015

On the possible pyrochlore to aurivillius phase transition in the complex oxide CaCd2Bi2Nb4O15

M.L. Craus1, I. Rusu2, A. Rusu2 and N. Apostolescu2

1  Institute for Technical Physics, Bd. Dimitrie Mangeron 47, Iasi 6600, Romania
2  Technical University Gh. Asachi, Faculty of Industrial Chemistry, Bd. Dimitrie Mangeron 71, Iasi 6600, Romania

The sample CaCd2Bi2Nb4O15 was synthesised by the standard ceramic method, starting from a mixture of oxides heated up to 1250°C. The chemical composition indicate that the oxide could have an Aurivillius or a substituted pyrochlore structure. The X-ray diffraction and IR spectra suggest a phase transition from pyrochlore, at -196°C, to Aurivillius at room temperature. The DSC analyses performed in the temperature range 20-400°C did not evidenced major phase transitions for the material.

© EDP Sciences 2001