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

Yunfei Chang, Soonil Lee, Stephen Poterala, Clive A. Randall, Gary Lynn Messing

Research output: Contribution to journalArticle

12 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)3044-3050
Number of pages7
JournalJournal of Materials Research
Volume26
Issue number24
DOIs
StatePublished - Nov 24 2011

Fingerprint

Grain growth
Ferroelectric materials
evaluation
Textures
textures
Densification
ceramics
densification
Nucleation
templates
nucleation
Coarsening
Powders
matrices
Seed
seeds
Crystals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "A critical evaluation of reactive templated grain growth (RTGG) mechanisms in highly [001] textured Sr0.61Ba0.39Nb2O6 ferroelectric-thermoelectrics",
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.",
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A critical evaluation of reactive templated grain growth (RTGG) mechanisms in highly [001] textured Sr0.61Ba0.39Nb2O6 ferroelectric-thermoelectrics. / Chang, Yunfei; Lee, Soonil; Poterala, Stephen; Randall, Clive A.; Messing, Gary Lynn.

In: Journal of Materials Research, Vol. 26, No. 24, 24.11.2011, p. 3044-3050.

Research output: Contribution to journalArticle

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