Phase formation kinetics of nanoparticle-seeded strontium bismuth tantalate powder

G. M. Anilkumar; Yun Mo Sung

doi:10.1023/A:1022939624043

Phase formation kinetics of nanoparticle-seeded strontium bismuth tantalate powder

G. M. Anilkumar, Yun Mo Sung

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Strontium bismuth tantalate (SBT) having composition of Sr_0.7Bi_2.3Ta₂O₉ has been prepared through sol-gel method using their corresponding metal alkoxides as precursors. Seeded SBT powder was prepared by the addition of 5 wt% of nanometer-sized SBT particles to the sol followed by pyrolysis. Differential thermal analyses (DTA) were performed on the unseeded and seeded powder and Aurivillius phase formation temperatures were found to be reduced by ∼60°C in the seeded ones. Non-isothermal kinetic analyses were applied to the DTA results to obtain activation energy and Avrami exponent values for the Aurivillius phase formation in unseeded and seeded samples. The activation energy for the Aurivillius phase formation was found to be ∼268 kJ/mol for the seeded ones, while ∼375 kJ/mol for the unseeded ones, which plays a major role for the enhanced kinetics in the seeded ones. The Avrami exponent values for the Aurivillius phase formation in unseeded and seeded ones were determined as ∼2.80 and ∼1.15, respectively, revealing different nucleation and crystal growth mechanisms.

Original language	English
Pages (from-to)	1391-1396
Number of pages	6
Journal	Journal of Materials Science
Volume	38
Issue number	7
DOIs	https://doi.org/10.1023/A:1022939624043
Publication status	Published - 2003 Apr 1
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported by grant No. (R05-2001-000-00810-0) from Basic Research Program of the Korea Science and Engineering Foundation (KOSEF). One of the authors (Gopinathan M. Anilkumar) acknowledges KOSEF for the financial support through “Post Doctoral Fellowships for Foreign Researchers” program in 2001.

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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title = "Phase formation kinetics of nanoparticle-seeded strontium bismuth tantalate powder",

abstract = "Strontium bismuth tantalate (SBT) having composition of Sr0.7Bi2.3Ta2O9 has been prepared through sol-gel method using their corresponding metal alkoxides as precursors. Seeded SBT powder was prepared by the addition of 5 wt% of nanometer-sized SBT particles to the sol followed by pyrolysis. Differential thermal analyses (DTA) were performed on the unseeded and seeded powder and Aurivillius phase formation temperatures were found to be reduced by ∼60°C in the seeded ones. Non-isothermal kinetic analyses were applied to the DTA results to obtain activation energy and Avrami exponent values for the Aurivillius phase formation in unseeded and seeded samples. The activation energy for the Aurivillius phase formation was found to be ∼268 kJ/mol for the seeded ones, while ∼375 kJ/mol for the unseeded ones, which plays a major role for the enhanced kinetics in the seeded ones. The Avrami exponent values for the Aurivillius phase formation in unseeded and seeded ones were determined as ∼2.80 and ∼1.15, respectively, revealing different nucleation and crystal growth mechanisms.",

author = "Anilkumar, {G. M.} and Sung, {Yun Mo}",

note = "Funding Information: This work was supported by grant No. (R05-2001-000-00810-0) from Basic Research Program of the Korea Science and Engineering Foundation (KOSEF). One of the authors (Gopinathan M. Anilkumar) acknowledges KOSEF for the financial support through “Post Doctoral Fellowships for Foreign Researchers” program in 2001.",

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PY - 2003/4/1

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N2 - Strontium bismuth tantalate (SBT) having composition of Sr0.7Bi2.3Ta2O9 has been prepared through sol-gel method using their corresponding metal alkoxides as precursors. Seeded SBT powder was prepared by the addition of 5 wt% of nanometer-sized SBT particles to the sol followed by pyrolysis. Differential thermal analyses (DTA) were performed on the unseeded and seeded powder and Aurivillius phase formation temperatures were found to be reduced by ∼60°C in the seeded ones. Non-isothermal kinetic analyses were applied to the DTA results to obtain activation energy and Avrami exponent values for the Aurivillius phase formation in unseeded and seeded samples. The activation energy for the Aurivillius phase formation was found to be ∼268 kJ/mol for the seeded ones, while ∼375 kJ/mol for the unseeded ones, which plays a major role for the enhanced kinetics in the seeded ones. The Avrami exponent values for the Aurivillius phase formation in unseeded and seeded ones were determined as ∼2.80 and ∼1.15, respectively, revealing different nucleation and crystal growth mechanisms.

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Phase formation kinetics of nanoparticle-seeded strontium bismuth tantalate powder

Abstract

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