Formation of metastable bc8 phase from crystalline Si0.5Ge0.5 by high-pressure torsion

Yoshifumi Ikoma; Terumasa Yamasaki; Takahiro Shimizu; Marina Takaira; Masamichi Kohno; Qixin Guo; Martha R. McCartney; David J. Smith; Yasutomo Arai; Zenji Horita

doi:10.1016/j.matchar.2020.110590

Formation of metastable bc8 phase from crystalline Si_0.5Ge_0.5 by high-pressure torsion

Yoshifumi Ikoma, Terumasa Yamasaki, Takahiro Shimizu, Marina Takaira, Masamichi Kohno, Qixin Guo, Martha R. McCartney, David J. Smith, Yasutomo Arai, Zenji Horita

Research output: Contribution to journal › Article › peer-review

Abstract

Si_0.5Ge_0.5 crystals were subjected to severe plastic deformation using high-pressure torsion (HPT). A metastable body-centered-cubic phase having a bc8 structure was formed by HPT processing with anvil rotations. High-resolution transmission electron microscopy analysis revealed that nanograins having diamond-cubic (dc) and bc8 phases were present in the HPT-processed sample. The bc8 phase was reverse transformed back to the dc phase after annealing. The resistivity of the crystalline Si_0.5Ge_0.5 (~9 × 10⁻³ Ω·cm) increased by roughly a factor of 6 after compression, and remained on the same order of magnitude but decreased slightly after 10 anvil rotations despite the grain refinement. These results indicate that the electrical behavior of bc8-Si_0.5Ge_0.5 is similar to that of bc8-Si.

Original language	English
Article number	110590
Journal	Materials Characterization
Volume	169
DOIs	https://doi.org/10.1016/j.matchar.2020.110590
Publication status	Published - Nov 2020

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Formation of metastable bc8 phase from crystalline Si_0.5Ge_0.5 by high-pressure torsion. / Ikoma, Yoshifumi; Yamasaki, Terumasa; Shimizu, Takahiro; Takaira, Marina; Kohno, Masamichi; Guo, Qixin; McCartney, Martha R.; Smith, David J.; Arai, Yasutomo; Horita, Zenji.

In: Materials Characterization, Vol. 169, 110590, 11.2020.

Research output: Contribution to journal › Article › peer-review

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title = "Formation of metastable bc8 phase from crystalline Si0.5Ge0.5 by high-pressure torsion",

abstract = "Si0.5Ge0.5 crystals were subjected to severe plastic deformation using high-pressure torsion (HPT). A metastable body-centered-cubic phase having a bc8 structure was formed by HPT processing with anvil rotations. High-resolution transmission electron microscopy analysis revealed that nanograins having diamond-cubic (dc) and bc8 phases were present in the HPT-processed sample. The bc8 phase was reverse transformed back to the dc phase after annealing. The resistivity of the crystalline Si0.5Ge0.5 (~9 × 10−3 Ω·cm) increased by roughly a factor of 6 after compression, and remained on the same order of magnitude but decreased slightly after 10 anvil rotations despite the grain refinement. These results indicate that the electrical behavior of bc8-Si0.5Ge0.5 is similar to that of bc8-Si.",

author = "Yoshifumi Ikoma and Terumasa Yamasaki and Takahiro Shimizu and Marina Takaira and Masamichi Kohno and Qixin Guo and McCartney, {Martha R.} and Smith, {David J.} and Yasutomo Arai and Zenji Horita",

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AU - Ikoma, Yoshifumi

AU - Yamasaki, Terumasa

AU - Shimizu, Takahiro

AU - Takaira, Marina

AU - Kohno, Masamichi

AU - Guo, Qixin

AU - McCartney, Martha R.

AU - Smith, David J.

AU - Arai, Yasutomo

AU - Horita, Zenji

PY - 2020/11

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