Phase transformation of germanium by processing through high-pressure torsion: strain and temperature effects

Yoshifumi Ikoma, Kazuki Kumano, Kaveh Edalati, Katsuhiko Saito, Qixin Guo, Zenji Horita

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Germanium has been processed by high-pressure torsion (HPT) under a nominal pressure of 24 GPa at room temperature and cryogenic temperature. The samples processed at room temperature were composed of a diamond-cubic Ge-I phase and a metastable tetragonal Ge-III phase. The formation of Ge-III was significantly suppressed and Ge-I and an amorphous phase, in addition to a small amount of body-centred-cubic Ge-IV, appeared in the case of cryogenic HPT processing at 100 K. The Ge-IV phase gradually disappeared at room temperature. These results indicated that shear strain and thermal energy are important for promoting the formation of Ge-III.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalPhilosophical Magazine Letters
Volume97
Issue number1
DOIs
Publication statusPublished - Jan 2 2017

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torsion
phase transformations
temperature effects
germanium
room temperature
shear strain
cryogenic temperature
thermal energy
cryogenics
diamonds
temperature
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Phase transformation of germanium by processing through high-pressure torsion : strain and temperature effects. / Ikoma, Yoshifumi; Kumano, Kazuki; Edalati, Kaveh; Saito, Katsuhiko; Guo, Qixin; Horita, Zenji.

In: Philosophical Magazine Letters, Vol. 97, No. 1, 02.01.2017, p. 27-34.

Research output: Contribution to journalArticle

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AU - Guo, Qixin

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