关键词: 钛酸钡陶瓷;固相反应法;升温速率;压电性能

Abstract: BaTiO3 ceramics were prepared by traditional solid state reaction method at different heating rates and the crystal structure, surface morphology, dielectric, piezoelectric and ferroelectric properties of ceramic samples were tested and analyzed.The results show that when the sintering temperature rate is 3 ℃/min and 5 ℃/min, the ceramic is tetrahedral perovskite lattice structure.With the increase of the heating rate, the tetragonal phase increases while the average grain size decreases, electrical coefficient and the ferroelectric properties decrease with it.However, the dielectric constant increases.When the sintering temperature rate is 5 ℃/min, dielectric constant is the largest with the value of 3144.When the sintering temperature rate is 1 ℃/min, the ceramic is orthorhombic perovskite lattice structure, of which the d33 and Pr is the maximum, its value is Pr =10 μC/cm2 while d33=193 pC/N.

Key words: BaTiO3 ceramics were prepared by traditional solid state reaction method at different heating rates and the crystal structure, surface morphology, dielectric, piezoelectric and ferroelectric properties of ceramic samples were tested and analyzed.The results show that when the sintering temperature rate is 3 ℃/min and 5 ℃/min, the ceramic is tetrahedral perovskite lattice structure.With the increase of the heating rate, the tetragonal phase increases while the average grain size decreases, electrical coefficient and the ferroelectric properties decrease with it.However, the dielectric constant increases.When the sintering temperature rate is 5 ℃/min, dielectric constant is the largest with the value of 3144.When the sintering temperature rate is 1 ℃/min, the ceramic is orthorhombic perovskite lattice structure, of which the d33 and Pr is the maximum, its value is Pr =10 μC/cm2 while d33=193 pC/N.