Issue 36, 2018, Issue in Progress

Reactive intermediate phase cold sintering in strontium titanate


Dense (>96% theoretical) strontium titanate ceramics were fabricated at 950 °C (conventional sintering temperature > 1400 °C) using a reactive intermediate phase cold sintering process. An aqueous solution of SrCl2 mixed with TiO2 nanoparticles was added to SrTiO3 powders and pressed at 180 °C to obtain a highly compacted green body. During the post-press heating step at 950 °C, the TiO2 and SrCl2 create in-filling micro-reactions around each grain resulting in dense (>96%) SrTiO3 ceramics. Nano- and micron-sized starting powders were used, demonstrating that this reactive intermediate phase cold sintering route can densify a wide range of starting powder sizes, as it not reliant on an amorphous-to-crystalline precipitation through the terrace ledge kink mechanism, as has been identified repeatedly in previous cold sintering mechanisms. Moreover, this process has the potential to densify a wide variety of functional oxides, as a range of different low-temperature chemical synthesis routes could be used.

Graphical abstract: Reactive intermediate phase cold sintering in strontium titanate

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Article information

Article type
10 Apr 2018
26 May 2018
First published
04 Jun 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 20372-20378

Reactive intermediate phase cold sintering in strontium titanate

R. Boston, J. Guo, S. Funahashi, A. L. Baker, I. M. Reaney and C. A. Randall, RSC Adv., 2018, 8, 20372 DOI: 10.1039/C8RA03072C

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