Doping elements influence on microstructural and dielectric properties of alpha alumina

摘要

Reloation between microstructural and dielectric properties of Cr and/or Mn doped aluminas is investigated. Samples with different microstructures were synthesized (parameters: density, grain sizes and shapes, nature and proportions of dopants) and characterized. Initial-stage sintering mechanisms were studied by isothermal and non-isothermal dilatometric experiments. High voltage breakdown tests were performed to evaluate dielectric properties.