期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 779, 期 -, 页码 394-398出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.086
关键词
Severe plastic deformation (SPD); Vanadium dioxide (VO2); SiO2 glass; Phase transition; Ultrafine-grained (UFG) ceramics; Nanostructured oxides
资金
- MEXT, Japan [16H04539, 26220909]
- Region Normandie, France
- French National Research Agency [ANR-11-EQPX-0020]
Plastic deformation of oxides is generally difficult due to their hard and brittle nature resulting from their covalent or ionic bondings. In this study, severe plastic deformation was successfully introduced in SiO2 glass and crystalline VO2 by high-pressure torsion (HPT). SiO2 glass transformed to a denser amorphous phase without showing any crystallization after processing in the temperature range of 300-723 K. Crystalline VO2 transformed from the coarse-grained monoclinic phase to a nanograined triclinic phase with insulating electrical properties by plastic strain effect. These findings indicate the potential of HPT process in tuning the crystal structure of optical and electrical oxides. (C) 2018 Elsevier B.V. All rights reserved.
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