Pressureless reactive sintering mechanism of nanocrystalline Bi 2O 3-Y 2O 3 solid electrolyte

Abstract

Abstract The nanocrystalline Bi 2O 3-Y 2O 3 solid electrolyte material was synthesized by pressureless reactive sintering process with Bi 2O 3 and Y 2O 3 nano mixed powder as raw materials, which was prepared by a chemical coprecipitation process. The study on the behavior of nano δ-Bi 2O 3 formation and its grain growth showed that the solid solution reaction of Y 2O 3 and β-Bi 2O 3 to form δ-Bi 2O 3 occurs mainly in the initial stage of sintering process, and nano δ-Bi 2O 3 crystal grains grow approximately following the rule of paracurve (( D− D 0) 2= K·t) during sintering process. After sintered at 600°C for 2 h, the samples could reach above 96% in relative density and have dense microstructure with few remaining pores, the δ-Bi 2O 3 grains are less than 100 nm in size.