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A critical evaluation of reactive templated grain growth (RTGG) mechanisms in highly [001] textured Sr0.61Ba0.39Nb2O6 ferroelectric-thermoelectrics

Published online by Cambridge University Press:  23 November 2011

Yunfei Chang ,
Soonil Lee ,
Stephen Poterala ,
Clive A. Randall  and
Gary L. Messing
Yunfei Chang*
Affiliation:
Department of Materials Science and Engineering, Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Soonil Lee
Affiliation:
Department of Materials Science and Engineering, Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Stephen Poterala
Affiliation:
Department of Materials Science and Engineering, Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Clive A. Randall
Affiliation:
Department of Materials Science and Engineering, Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Gary L. Messing
Affiliation:
Department of Materials Science and Engineering, Center for Dielectric Studies, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In reactive templated grain growth (RTGG), oriented template crystals are used to seed both phase formation and crystallographic orientation in textured ceramics. This mechanism differs substantially from templated grain growth (TGG), in which texture forms via grain growth mechanism. In this work, characteristics of both RTGG and TGG processes are evaluated in [001] textured Sr0.61Ba0.39Nb2O6 ceramics produced from reactive SrNb2O6 and BaNb2O6 matrix powders and acicular KSr2Nb5O15 (KSN) templates. Above 1100 °C, SrxBa1−xNb2O6 (SBN) forms by oriented nucleation and growth on KSN (the RTGG process) and by nucleation of nonoriented matrix grains. RTGG occurs without densification or coarsening until phase formation is complete (∼1250 °C) and accounts for ∼60% of the texture in dense SBN ceramics. A later TGG process occurs from 1250–1350 °C and is characterized by simultaneous densification, grain growth, and additional texture development.

Keywords

TextureThermoelectricCrystal growth
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 24 , 28 December 2011 , pp. 3044 - 3050
Copyright
Copyright © Materials Research Society 2011

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