J. Phys. IV France 11 (2001) Pr10-109-Pr10-113
On the possible pyrochlore to aurivillius phase transition in the complex oxide CaCd2Bi2Nb4O15M.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