Temperature dependence of the dielectric constant of nanograin BaTiO 3 ceramic has been investigated under hydrostatic pressure σ up to 5 GPa. We found that the paraelectric-ferroelectric phase transition temperature TC decreases with σ at a rate of dTC/dσ=-40.0 (±1.1) KGPa for coarse-grain ceramic and -34.3 (±1.4) KGPa for ceramic with 60 nm grains. The variation of intergranular stresses with reducing grain size is considered as the main factor causing the decrease of TC and the change of d TC dσ.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)