DOMAIN ARRANGEMENTS IN FLUX-GROWN PBTIO3 SINGLE-CRYSTALS

The Bur method was used to grow PbTiO3 single crystals in the present experiment, and the domain structures of polydomain as-grown crystals have been studied using optical and electron microscopy. Investigation s on etched crystals indicate that crystals grown under different cond itions have similar domain structural characteristics, but those grown under conditions with heavy PbO evaporation show relatively complicat ed 90 degrees domain arrangements. Various domain structures have been observed, including conventional 90 degrees domain arrangements, herr ingbone structures, banded structures, and intersecting banded structu res. In addition, domain bands that may correspond to transformation v ariants in alloys were also seen. Drawing schematic polarization confi gurations, one finds that head-to-head, tail-to-tail, or other unconve ntional domain configurations exist constantly in PbTiO3 crystals, ind icating that the high energy configurations are quite common in lead t itanate crystals.