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Crystallization kinetics and dielectric properties of nanocrystalline lead strontium barium niobates

Published online by Cambridge University Press:  03 March 2011

Ching-Tai Cheng ,
Michael Lanagan ,
Jiang-Tsair Lin ,
Beth Jones  and
Ming-Jen Pan
Ching-Tai Cheng
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 31040, Republic of China; and Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Michael Lanagan*
Affiliation:
Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Jiang-Tsair Lin
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 31040, Republic of China
Beth Jones
Affiliation:
Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Ming-Jen Pan
Affiliation:
Nova Research, Inc., Alexandria, Virginia 22308
*
a) Address all correspondence to this author. e-mail: mx146@psu.edu
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Abstract

The crystallization kinetics and phase developments of PbO–BaO–SrO–Nb2O5–B2O3–SiO2-based glass-ceramics was investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between the as-heated surface and the interior of glass-ceramics. This effect could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb2O6 crystals was substantially smaller than that of surface-nucleated crystals. This result facilitated meeting the capacitors as high energy density application due to the ultrafine grains (<60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramic, which was attributed to a significant volume fraction of (Pb, Sr, Ba) Nb2 O6 phase.

Keywords

CeramicDielectricElectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 438 - 446
Copyright
Copyright © Materials Research Society 2005

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