Size and Temperature Dependence of Dielectric Constant of Ultrafine PbTiO_(3) Particles

摘要

Using sol-gel method,we prepared ferroelectric PbTiO_(3) fine particles with particle size covering the range 20-200nm;the dielectric properties of powder compact were studied in the present work.The room temperature dielectric constant increases with the decrease in particle size and reaches a maximum value at the size of about 40nm.The temperature dependence of dielectric constant involving the evolution of particle size during the measurement is discussed.