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Characterization of single layer PZT (53/47) films prepared from an air-stable sol-gel route

Published online by Cambridge University Press:  03 March 2011

Y.L. Tu  and
S.J. Milne
Y.L. Tu
Affiliation:
Division of Ceramics, School of Materials, The University of Leeds, Leeds LS2 9JT, United Kingdom
S.J. Milne
Affiliation:
Division of Ceramics, School of Materials, The University of Leeds, Leeds LS2 9JT, United Kingdom
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Abstract

Single layer Pb(Zr0.53Ti0.47)O3 films up to 0.7 μm thick have been prepared from air-stable titanium and zirconium precursors using a diol-based sol-gel route. Information on film crystallization, surface microstructure, and electrical properties under different firing temperatures and three different heating rates including rapid thermal annealing are presented. Films exhibited (111) preferred orientation, the extent of which reduced with increasing firing temperature or heating rate. It is possible that a PbPtx interfacial reaction product was formed during the prefiring step at 350 °C and this, together with the influence of the 111 bottom platinum electrode, contributed to (111) orientation in the PZT films. Surface microstructure was also influenced by firing temperature and heating rate as well as by film thickness. The 0.4 μm thick films used for electrical measurement had a grain size of ⋚0.1 μm, whereas 0.7 μm thick films made from concentrated sols exhibited “rosette” microstructures with grain sizes up to 0.5 μm. Among the three firing schedules studied, directly inserting the gel coatings in a furnace preset at 700 °C produced films with the most favorable electrical properties. A 0.4 μm thick film gave rise to a remanent polarization, Pr, of 33 μC cm−2 coercive field, Ec, of 46 kV cm−1; relative permittivity, ∊r, of 1100; and dissipation factor, D, of 0.05. For a 0.7 μm single layer film, the respective values were 21 μC cm−2, 36 kV cm−1, 1300, and 0.05.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 12 , December 1995 , pp. 3222 - 3231
Copyright
Copyright © Materials Research Society 1995

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