TY - JOUR
KW - Thin films
KW - Lattice constants
KW - Phase transitions
KW - Heat treatment
KW - Ferroelectric materials
KW - Epitaxial growth
KW - Structural phase transition
KW - Epitaxial constraints
KW - Barium compounds
KW - Ferroelectric instability
KW - Ferroelectric phase transition
KW - High temperature effects
AU - F Bai
AU - H Zheng
AU - H Cao
AU - L.E Cross
AU - Ramamoorthy Ramesh
AU - J Li
AU - D Viehland
AB - For (001) coriented BaTiO 3 thin films, it has been found that epitaxial constraint can result in a dramatic increase in the temperature of a tetragonal (T) structural phase transition. For 2000-Å-thick films grown directly on SrTiO 3 substrates, a T → cubic (C) phase transition was found on heating at >950 K, where the lattice constant changed smoothly with temperature. It was also found for films of the same thickness that the T → C transition is nearly restored to that of bulk crystals by the use of a buffer layer, which relaxes the epitaxial constraint. These results provide evidence of an epitaxially induced high temperature structural phase transition in BaTiO 3thin films, where the ferroelectric (internal) and structural (external) aspects of the phase transition are decoupled. © 2004 American Institute of Physics.
BT - Applied Physics Letters
DO - 10.1063/1.1812579
LA - eng
M1 - 18
N1 - cited By 20
N2 - For (001) coriented BaTiO 3 thin films, it has been found that epitaxial constraint can result in a dramatic increase in the temperature of a tetragonal (T) structural phase transition. For 2000-Å-thick films grown directly on SrTiO 3 substrates, a T → cubic (C) phase transition was found on heating at >950 K, where the lattice constant changed smoothly with temperature. It was also found for films of the same thickness that the T → C transition is nearly restored to that of bulk crystals by the use of a buffer layer, which relaxes the epitaxial constraint. These results provide evidence of an epitaxially induced high temperature structural phase transition in BaTiO 3thin films, where the ferroelectric (internal) and structural (external) aspects of the phase transition are decoupled. © 2004 American Institute of Physics.
PY - 2004
SP - 4109
EP - 4111
T2 - Applied Physics Letters
TI - Epitaxially induced high temperature (>900 K) cubic-tetragonal structural phase transition in BaTiO 3 thin films
VL - 85
SN - 00036951
ER -