X-RAY-DIFFRACTION STUDIES OF PHASE-TRANSFORMATIONS BETWEEN TETRAGONALAND CUBIC PHASES IN THE BASNXTI1-XO3 SYSTEM

X-ray powder diffraction has been used to investigate the cubic-tetrag onal phase transformation and lattice constant in a BaSnxTi1-xO3 syste m (x = 0.0-0.2) at room temperature. The existing regions of tetragona l phase were strongly influenced by the amounts of tin (from x = 0.0-0 .1). The mass fraction of the tetragonal phase decreases as substituti on of tin for titanium increases until x = 0.1, while the mass fractio n of the cubic phase increases simultaneously. The lattice constant of cubic phase and the cube roots of the unit-cell volumes of tetragonal phases indicate linear relations with the amounts of tin. (C) 1998 Ch apman & Hall.