Effect of external stress on the dielectric temperature characteristics of samarium-modified barium titanate

Abstract

Various particle sizes of starting barium titanate were used to investigate the effect of external stress on the dielectric temperature characteristics of a solid solution of samarium-modified barium titanate. Transmission electron microscopy and energy dispersive spectroscopy confirmed the chemically homogeneous grain. The grain size was somewhat proportional to the particle size of starting barium titanate, The dielectric temperature characteristics will be explained in the present paper in terms of external stress. The external stress shifted the T-c to a lower temperature, T-1 and T-2 to a higher. Actually, the dielectric temperature characteristics of large grains (> 2 mu m) proved to be a function of variation in the external stress, whereas those of small grains (< 2 mu m) was a function of both the internal stress and external stress.