MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Oxygen Partial Pressure on Structure and Dielectric Property of BaTi2O5 Films Prepared by Laser Ablation
Chuanbin WangRong TuTakashi Goto
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2007 Volume 48 Issue 3 Pages 625-628

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Abstract

BaTi2O5 ferroelectric films were prepared on MgO (100) substrates by laser ablation at various oxygen partial pressures (PO2). The effect of PO2 on the orientation, composition, surface morphology and dielectric property of the films was investigated. The molar ratio of Ti to Ba was independent of PO2, almost in agreement with the stoichiometric composition of BaTi2O5. The BaTi2O5 films showed the orientation of (710) and (020) depending on PO2. At PO2=12.5 Pa, (020) oriented BaTi2O5 film with an elongated granular and perpendicularly crossing texture was epitaxially grown on MgO (100) substrates. The BaTi2O5 film prepared at PO2=12.5 Pa exhibited a sharp permittivity maximum (ε′≈2000) at 750 K.

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© 2007 The Japan Institute of Metals and Materials
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