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Lead titanate glass-ceramics derived from a silicate-based melt

Published online by Cambridge University Press:  03 March 2011

P. Sooksaen ,
I.M. Reaney  and
D.C. Sinclair
P. Sooksaen*
Affiliation:
Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom
I.M. Reaney
Affiliation:
Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom
D.C. Sinclair
Affiliation:
Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom
*
a) Address all correspondence to this author. e-mail: p_sooksaen@hotmail.com
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Abstract

Glass composition 39PbO–1BaO–25TiO2–9.8Al2O3–24.2SiO2–1B2O3 (mol%) crystallized on heat treatment at ≥600 °C to form glass-ceramics whose majority phase was PbTiO3 (PT). At 600 °C, nano-size PT crystals (∼20–50 nm) with a c/a ratio of 1.000(1) were observed, but as heat-treatment temperature increased to 1000 °C, the crystal size and c/a ratio increased to ∼1.2 μm and 1.056(4), respectively. Permittivity measurements as a function of temperature revealed a broad peak at ∼400 °C associated with the nanocrystalline PT crystals, but it sharpened and increased in temperature as heat treatment temperature increased to 1000 °C. The causes of peak broadening and shift of Tc are believed to be due to either clamping of PT crystals by glass matrix, finite size effects due to their intrinsically small size, or the incorporation of dopant impurities such as Al, Si, or Ba ions in the PT phase.

Keywords

CrystalDielectric propertiesGlass
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 5 , May 2005 , pp. 1316 - 1323
Copyright
Copyright © Materials Research Society 2005

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