Jang, JW Youn, HJ Byun, C Kim, IT Hong, KS 2024-01-21T16:02:38Z 2024-01-21T16:02:38Z 2022-01-25 1999-01 0015-0193 https://pubs.kist.re.kr/handle/201004/142450 Ferroelectric domain structures of polycrystalline PbTiO3 thin films were investigated by using transmission electron microscopy. The grain size of the prepared films ranged from 300 Angstrom to 2000 Angstrom. It was observed that 90 degrees domains displayed the shape of simple lamella twinning, with neighboring grains connected across grain boundaries; even at very small grains such as 300 Angstrom, domain structures were found. In some 90 degrees domain boundaries, defects such as dislocations were found. These configurations of 90 degrees domains are associated with stress relief due to the very large tetragonality of PbTiO3 thin films which was estimated to be about 1.057; this value was nearly constant independent of grain size. 180 degrees domains showed 90 degrees-domain-dependent structures with irregular morphologies. The structure of 180 degrees domains was discussed in terms of energy minimization during phase transitions. English GORDON BREACH SCI PUBL LTD Ferroelectric domain structures of polycrystalline PbTiO3 thin films prepared by MOCVD Article 10.1080/00150199908224187 1 FERROELECTRICS, v.227, no.1-4, pp.15 - 28 FERROELECTRICS 227 1-4 15 28 N scie scopus 000082222600002 2-s2.0-0004038733 Materials Science, Multidisciplinary Physics, Condensed Matter Materials Science Physics Article DIELECTRIC-PROPERTIES CERAMICS BATIO3 PbTiO3 thin films ferroelectric domains 90 degrees domains 180 degrees domains simple lamella twinning tetragonality grain size