JECS-BV BT paper revised and submitted.pdf (1.9 MB)
Synthesis of nanocrystalline barium titanate: Effect of microwave power on phase evolution
journal contribution
posted on 2020-04-28, 09:07 authored by Vinothini Venkatachalam, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, Jon BinnerNanocrystalline BaTiO3 (BT) powder was synthesised using a polymer precursor route
and the influence of conventional, microwave and combined hybrid heating methods on
phase formation was investigated. A single-phase tetragonal BT (t-BT) nanocrystalline
powder of about 20 nm primary particle size and decreased agglomeration were formed
when high levels of microwave energy were used. This was accomplished at a lower
processing condition of 700 °C for 30 min compared to conventional processing, which
required 900 °C for 5 h, resulting in potential savings in time and energy. During the
nano BT synthesis, the role of microwaves was determined by subjecting the samples to
identical thermal histories, i.e. exactly the same time-temperature profiles, while using a
range of different levels of microwave power. Significant reduction in the activation
energy for the formation of the tetragonal phase was observed with increasing levels of
microwave power and the results are explained in terms of a possible non-thermal
mechanism. Furthermore, under otherwise identical thermodynamic conditions of
temperature, time and (atmospheric) pressure, the co-occurrence of hexagonal crystal
structure at < 200 W of additional microwave power along with formation of tetragonal
*Manuscript
Click here to view linked References crystal structure at ³ 200 W and single phase tetragonal crystal structure at ~1200 W
was observed, demonstrating a new method of controlling the phase evolution during
the synthesis of nanostructured barium titanate powder. The methodology could be
applied to synthesise a variety of functional ceramic powders with tailored levels of
crystallographic phases.
Funding
Nanostructured Advanced Ceramics (NASTRAC) : TS/G000891/1
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Journal of the European Ceramic SocietyVolume
40Issue
12Pages
3974 - 3983Publisher
ElsevierVersion
- AM (Accepted Manuscript)
Rights holder
© Crown CopyrightPublisher statement
This paper was accepted for publication in the journal Journal of the European Ceramic Society and the definitive published version is available at https://doi.org/10.1016/j.jeurceramsoc.2020.04.043.Acceptance date
2020-04-21Publication date
2020-05-04Copyright date
2020ISSN
0955-2219Publisher version
Language
- en
Depositor
Prof Vaidhy Vaidhyanathan. Deposit date: 27 April 2020Usage metrics
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