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Microstructural Model on the Evolution of Domain Structure during Processing of PbTiO 3 Thin Films on MgO(100) Substrates
Author(s) -
KimM Sangsub,
Kang Young Min,
Baik Sunggi
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08555.x
Subject(s) - materials science , curie temperature , epitaxy , thin film , substrate (aquarium) , deposition (geology) , sputtering , microstructure , condensed matter physics , sputter deposition , crystallography , composite material , nanotechnology , layer (electronics) , ferromagnetism , chemistry , geology , physics , sediment , paleontology , oceanography
A two‐dimensional microstructural model is proposed to explain the origin of the 90° domain structure of epitaxial PbTiO 3 thin films grown on MgO(100) substrates by radio frequency sputter deposition. During film deposition at or above 600°C, the film grows epitaxially in a cubic phase without any domain structure. At or just below the Curie temperature, the film mainly consists of α‐domains with a small portion of c ‐domains nucleated in a triangular shape. The c ‐domains gradually expand with decresasing temperature to relax the strain energy caused by the difference in thermal contraction rate between the c ‐axis of α‐domains and the substrate, forming consequently thin strips of α‐domains distributed in the matrix of c ‐domains at room temperature.