CHARACTERISTICS OF 90-DEGREES DOMAIN-WALL OF BARIUM-TITANATE IN REPEATED TRANSITIONS BETWEEN CUBIC AND TETRAGONAL PHASES

The characteristics of 90 degrees domain wall in Barium Titanate (BaTi O3) in the repeated cubic-to-tetragonal phase transitions were investi gated. Surface polishing and heat treatment affected on the arrangemen t of the 90 degrees domain walls. Especially, a relation between the 9 0 degrees domain configuration and the surface polishing in the repeat ed phase transition was observed. This relation found to be strongly r elated to the characteristics of the 90 degrees a-a and the 90 degrees a-e boundaries. Each characteristic depended on the surface deformati on due to the polishing and the phase transition. As the results, some 90 degrees a-a domain boundaries could be memorized in the forming po sition through the repeated phase transitions by surface polishing. A comprehensive model to explain this phenomenon was proposed.