Preparation of β″-Alumina with η Type Nanometer Alumina Powder via Solid Phase Synthesis

摘要

β″-alumina is a fast ion conductor material, it was used to prepare a new electrolyte for a secondary energy sodium sulfur battery. Nano-η-alumina has the advantages of high activity and small size, which can reduce the synthesis temperature of β″-alumina, β″-alumina is prepared with Sodium carbonate and η-alumina amount of substance ratio of 1:5.5 via solid phase synthesis. This paper mainly investigate the temperature on the influence of the content of β″-alumina and the samples' crystal structure. The samples were characterized by XRD and SEM. The results show that the mixed powder react to form rhombohedral β"-alumina at 1100°C； the highest content of β″-alumina is 87.26% at 1200°C; the β″-alumina decompose and part of β"-alumina gradually transform into hexagonal β″-alumina at 1300°C; the content of β"-alumina reduce and the grain grow at 1400°C; particle of the sample grow irregular and its crystal morphology is incomplete at 1500°C.