Woodward, David I. and Reaney, Ian M.. (2004) A structural study of ceramics in the (BiMnO3)x–(PbTiO3)1−x solid solution series. Journal of Physics: Condensed Matter, Vol.16 (No.49). pp. 8823-8834. ISSN 0953-8984

Abstract

Ceramics in the (BiMnO3)x–(PbTiO3)1−x series were fabricated with compositions in the range . A macroscopically pseudocubic structure was observed for compositions x>0.4 while at x<0.4 the structure is tetragonal. The presence of a pseudocubic structure is attributed to frustration between different preferred environments of cations, leading to an absence of long-range ordered polar ionic displacements. Microstructures similar to those of relaxors were observed at x = 0.4 and evidence of incommensurate ordering of antiparallel cation displacements was found at compositions. Permittivity measurements for x = 0.3 and 0.4 revealed diffuse frequency-dependent maxima between 100 and 300 °C. In addition, compositions with exhibited a sharp peak at higher temperature. The broad peaks are considered to arise from different time constants attributed to the grain interiors and boundaries for x = 0.3 and 0.4 whereas the sharp peak is interpreted as the Curie temperature of a tetragonal to cubic phase transition.

Request changes to a record

Actions (login required)

View Item