Abstract
In order to elucidate the correlation between the phase transitions and presence ofa relaxor phase in the composition Ba1−x(La0.5Na0.5)xTiO3, intermediate betweenBaTiO3 and (La0.5Na0.5)TiO3, measurements of the dielectric permittivity inthe temperature range 10–500 K in a heating–cooling cycle and powderx-ray diffraction measurements down to 150 K have been carried out onBa7/8(La0.5Na0.5)1/8TiO3, which has three phase transitions and weak relaxorferroelectric character below 500 K. The hysteresis observed in the dielectricpermittivity in the heating–cooling cycle and a weak tetragonality deduced from thec/aratio being very close to the cubic ratio for the tetragonal phase leadto the prediction of coexistence of multiple phases. The shrinkages ofthe temperature regions of the low-symmetry phases with increasingx inBa1−x(La0.5Na0.5)xTiO3 confirm this prediction. The deformation mode changes gradually fromΓ15 toR25with increase of x.The relation between the deformation mode and the phase transitions is alsodiscussed.
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