Structural phase transitions in BaTiO3 studied via Perturbed Angular Correlations

Phase transitions in the ferroelectric perovskite BaTiO3 were studied for I n-111-implanted polycrystalline samples by measuring the electric field gra dients by means of Perturbed Angular Correlation spectroscopy. The phase tr ansitions between the orthorhombic double left right arrow rhombohedral dou ble left right arrow tetragonal double left right arrow cubic lattices were investigated in 2 - 10 K steps, for increasing and decreasing temperatures , in order to determine their hysteresis. The transition parameters are com pared with results from measurements of the spontaneous polarization, elect ric susceptibility and neutron scattering.