THE EFFECTS OF POLISHING ON THE FORMATION OF 90-DEGREES DOMAIN-WALLS IN A BARIUM-TITANATE SINGLE-CRYSTAL

In an {100} BaTiO3 single crystal plate of 0.2 mm thickness, it was ob served that the surface of thin plate was deformed during the polishin g process and, as a result, the 90 degrees a-a boundaries were partial ly stabilized. These stabilized 90 degrees a-a walls were reappeared a t the exact their positions after repeated paraelectric-to-ferroelectr ic phase transition, i.e., they show a memory effect. These effects ca n be explained by the deformed surface layers and the characteristic a nisotropy of 90 degrees walls.