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Low temperature synthesis of lead titanate by a hydrothermal method

Published online by Cambridge University Press:  31 January 2011

Jooho Moon ,
Tuo Li ,
Clive A. Randall  and
James H. Adair
Jooho Moon
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
Tuo Li
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
Clive A. Randall
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
James H. Adair
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
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Abstract

Alkoxide-based hydrothermal powder synthesis of lead titanate was investigated. The objective of this work was to lower the synthesis temperature. By modifying titanium isopropoxide with acetylacetone during solution mixing, the phase-pure lead titanate with perovskite structure was synthesized at temperatures as low as 150 °C. It was determined that the pH of the hydrothermal reaction medium and the initial Pb/Ti ratio are critical factors in forming stoichiometric PbTiO3. When the pH of the initial feedstock is above 14 and the Pb/Ti ratio is greater than 1.5, a phase-pure PbTiO3 can be obtained. The modification of titanium alkoxide gave rise to the formation of a stable complex against hydrolysis and eventually reduced the synthesis temperature significantly. A possible formation mechanism for PbTiO3 is the dissolution-recrystallization from an amorphous precursor to a well-crystalline product as originally proposed by Rossetti et al. Hall–Williamson analysis was also performed on the hydrothermally derived PbTiO3 to interpret the systematic peak broadening and asymmetry for {001} reflections, unlike the commercial PbTiO3. It was observed that the strain in the c-axis direction is much higher than that in the a-axis direction while the domain sizes for both directions are similar. This strain anisotropy exerted in the particles may indicate a unique domain structure in the hydrothermally synthesized particles in which either only 180° domains exist or possibly only a single domain.

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Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 189 - 197
Copyright
Copyright © Materials Research Society 1997

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