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Crystals 2017, 7(11), 351; doi:10.3390/cryst7110351

Room-Temperature Plastic Deformation of Strontium Titanate Crystals Grown from Different Chemical Compositions

1
Department of Materials Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2
Department of Materials Science and Engineering, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
3
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
4
Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 11 October 2017 / Revised: 17 November 2017 / Accepted: 21 November 2017 / Published: 22 November 2017
(This article belongs to the Special Issue Crystal Dislocations: Their Impact on Physical Properties of Crystals)
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Abstract

Oxide materials have the potential to exhibit superior mechanical properties in terms of high yield point, high melting point, and high chemical stability. Despite this, they are not widely used as a structural material due to their brittle nature. However, this study shows enhanced room-temperature plasticity of strontium titanate (SrTiO3) crystals through the control of the chemical composition. It is shown that the deformation behavior of SrTiO3 crystals at room temperature depends on the Sr/Ti ratio. It was found that flow stresses in deforming SrTiO3 crystals grown from a powder with the particular ratio of Sr/Ti = 1.04 are almost independent of the strain rate because of the high mobility of dislocations in such crystals. As a result, the SrTiO3 crystals can deform by dislocation slip up to a strain of more than 10%, even at a very high strain rate of 10% per second. It is thus demonstrated that SrTiO3 crystals can exhibit excellent plasticity when chemical composition in the crystal is properly controlled. View Full-Text
Keywords: strontium titanate (STO); dislocations; transmission electron microscopy (TEM); single crystals; oxides strontium titanate (STO); dislocations; transmission electron microscopy (TEM); single crystals; oxides
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Nakamura, A.; Yasufuku, K.; Furushima, Y.; Toyoura, K.; Lagerlöf, K.P.D.; Matsunaga, K. Room-Temperature Plastic Deformation of Strontium Titanate Crystals Grown from Different Chemical Compositions. Crystals 2017, 7, 351.

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