Microstructure and Pyrochlore Phase Dependence on the Dielectric Properties of Lead Magnesium Niobate Ceramics

Lead Magnessium Niobate 세라믹의 유전성에 대한 미세구조와 Pyrochlore상 의존성

The effects of pyrochlore phase and micostructure on the dielectric properties. such as dielectric constant, dissipation factor, diffusensess coefficient and dielectric hysteresis characteristics, of Lead magnesium niobate(PMN) ceramics have been studied as a function of the amount of excess MgO. The pyrochlore phase in PMN was completely eliminated with the addition of 5 m/o excess MgO. Also, the dielectric constant and remanent polarization increased with increase in grain size, density and then decreased with grain growth inhibitation for further addition of excess MgO. The diffuseness coefficient showed a tendency nearly reverse to that for the dielectric constant and remanent polarization change.