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Influence of parallel evolving microstructure on thermal diffusivity in strontium titanate


Ibrahim, Idza Riati and Hashim, Mansor and Abdul Wahab, Zaidan and Matori, Khamirul Amin and Nazlan, Rodziah and Ismail, Ismayadi and Abdullah, Nor Hapishah and Wan Ab Rahman, Wan Norailiana and Mohd Idris, Fadzidah (2016) Influence of parallel evolving microstructure on thermal diffusivity in strontium titanate. Materials Science Forum, 846. pp. 416-425. ISSN 0255-5476; ESSN: 1662-9752


This paper reports some research findings on the parallel evolutions of microstructural properties and thermal diffusivity in strontium titanate. Strontium titanate samples have been prepared via the high energy ball milling technique and subsequently moulded by a hydraulic pressing and followed by cold isostatic pressing. Nanometer-sized compacted powder samples were sintered from 500 to 1400°C using 100°C increments. Strontium titanate formation was observed at as early as 500°C sintering temperature alongside secondary phases. The full formation of strontium titanate was observed at 800°C sintering temperature and above. Average grain sizes showed a fluctuating trend with increased sintering temperatures due to carbonate decomposition at lower sintering temperatures (500 to 800°C) and grain growth phenomenon at higher sintering temperatures (900 to 1400°C). Parallel characterization of evolving thermal diffusivity showed the same trend of fluctuation at low sintering temperatures as indirect relationship but increased with increased grain size due to a lesser amount of phonon scattering. However, thermal diffusivity values decreased with increased temperatures because of increased phonon-phonon scattering.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.4028/www.scientific.net/MSF.846.416
Publisher: Trans Tech Publications
Keywords: Evolution; Microstructure; Nanosized grains; Strontium titanate; Thermal diffusivity
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 20 Jun 2016 02:47
Last Modified: 20 Jun 2016 02:47
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.4028/www.scientific.net/MSF.846.416
URI: http://psasir.upm.edu.my/id/eprint/27892
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