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The formation mechanism of barium titanate thin film under hydrothermal conditions

Published online by Cambridge University Press:  03 March 2011

E. Shi ,
C.R. Cho ,
M.S. Jang ,
S.Y. Jeong  and
H.J. Kim
E. Shi
Affiliation:
Physics Department and Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Pusan, 609-735, Republic of Korea
C.R. Cho
Affiliation:
Physics Department and Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Pusan, 609-735, Republic of Korea
M.S. Jang
Affiliation:
Physics Department and Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Pusan, 609-735, Republic of Korea
S.Y. Jeong
Affiliation:
Physics Department and Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Pusan, 609-735, Republic of Korea
H.J. Kim
Affiliation:
Physics Department and Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Pusan, 609-735, Republic of Korea
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Abstract

Barium titanate thin films were produced under the hydrothermal conditions, and their formation mechanism was investigated. The phase structure and surface morphology of the resultant films were directly dependent on the reaction conditions. The films that have a reaction time shorter than 8 h below the processing temperature of 150 °C in the 0.8 N Ba(OH)2 solution were composed of compounds with the component ratio m(Ba)/ m(Ti) < 1, and a flower-like surface morphology. With extended reaction time under the higher temperature, the films showed a multiphase structure and a mosaic or island-like surface morphology. In the case of 1.0 N, 1.5 N Ba(OH)2 solution, well-crystallized, monoperovskite BaTiO3 thin films having uniform, mirror-like, and visible-defectless surfaces were produced at a processing temperature of 180 °C after 24 h. The experimental results were explained by hypothesizing that the formation mechanism consists of a “dissolutions-crystallization process”.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2914 - 2918
Copyright
Copyright © Materials Research Society 1994

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References

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