Synthesis of pyrochlore-free 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 ceramics via a soft mechanochemical route

Jong Gab Baek, Tetsuhiko Isobe, Mamoru Senna

Research output: Contribution to journalArticle

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Abstract

Single-phase perovskite 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 (0.9PMN-0.1 PT) from a stoichiometric mixture of starting materials was synthesized by applying a mechanochemical technique to the stage of a precursor. A stoichiometric mixture of PbO, TiO2, Mg(OH)2, and Nb2O5 was milled for 60 min and heated at temperatures as low as 850°C for 4 h to obtain a single phase. The maximum dielectric constant of the samples from the milled mixture increased as the sintering temperature increased, with the remarkable grain growth, and attained 24600 at 1200°C. In contrast, poor densification and coexistence of the pyrochlore phase were observed on the samples from the nonmilled mixture. Further observation suggested that the pyrochlore phase concentrated near the surface during sintering and then migrated into the PbZrO3 packing powder, leading to a pyrochlore-free phase at 1250°C. The dielectric constant of the latter ceramics was explained by the series mixing rule for the dielectric constant of a diphasic solid.

Original languageEnglish
Pages (from-to)973-981
Number of pages9
JournalJournal of the American Ceramic Society
Volume80
Issue number4
Publication statusPublished - 1997 Apr

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Permittivity
Sintering
Grain growth
Densification
Powders
Perovskite
Temperature
pyrochlore
perovskite

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Synthesis of pyrochlore-free 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 ceramics via a soft mechanochemical route. / Baek, Jong Gab; Isobe, Tetsuhiko; Senna, Mamoru.

In: Journal of the American Ceramic Society, Vol. 80, No. 4, 04.1997, p. 973-981.

Research output: Contribution to journalArticle

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abstract = "Single-phase perovskite 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 (0.9PMN-0.1 PT) from a stoichiometric mixture of starting materials was synthesized by applying a mechanochemical technique to the stage of a precursor. A stoichiometric mixture of PbO, TiO2, Mg(OH)2, and Nb2O5 was milled for 60 min and heated at temperatures as low as 850°C for 4 h to obtain a single phase. The maximum dielectric constant of the samples from the milled mixture increased as the sintering temperature increased, with the remarkable grain growth, and attained 24600 at 1200°C. In contrast, poor densification and coexistence of the pyrochlore phase were observed on the samples from the nonmilled mixture. Further observation suggested that the pyrochlore phase concentrated near the surface during sintering and then migrated into the PbZrO3 packing powder, leading to a pyrochlore-free phase at 1250°C. The dielectric constant of the latter ceramics was explained by the series mixing rule for the dielectric constant of a diphasic solid.",
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