Unusual elasticity of monoclinic β-Ga2O3

Adachi, K.; Ogi, H.; Takeuchi, N.; Nakamura, N.; Watanabe, H.; Ito, T.; Ozaki, Y.

doi:https://doi.org/10.1063/1.5047017

Unusual elasticity of monoclinic β-Ga2O3

Adachi, K.; Ogi, H.; Takeuchi, N. et al.

Journal of Applied Physics, 2018, 124(8), 085102-1-085102-7

Number of Access:1,016（2025-11-25 02:20 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84235

Link to primary information

File	Format	Terms of use	Size	Views	Date.Available	Description	information
JApplPhys_124_8	pdf	None	1.43 MB	521	2021.09.16

Item Information

Output File Export EndNote Basic Export Mendeley

Title	Unusual elasticity of monoclinic β-Ga2O3
Creator	NRID 1000060521739 1000060521739 CreatorName Adachi, K.
	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 ORCID 0000-0002-9602-5194 0000-0002-9602-5194 CreatorName Ogi, H.
	CreatorName Takeuchi, N.
	NRID 1000050452404 1000050452404 researchmap permalink nnakamura nnakamura Scopus Author ID 7403356186 7403356186 ORCID 0000-0002-5338-842X 0000-0002-5338-842X CreatorName Nakamura, N.
	CreatorName Watanabe, H.
	CreatorName Ito, T.
	NRID 1000010029308 1000010029308 CreatorName Ozaki, Y.
Description	Adachi K., Ogi H., Takeuchi N., et al. "Unusual elasticity of monoclinic β-Ga2O3", Journal of Applied Physics, 124(8), 085102 (2018) https://doi.org/10.1063/1.5047017.
Abstract	This paper determines all the 13 elastic constants Cij of monoclinic β-Ga2O3, which has never been achieved since the discovery of this crystal about 100 years ago. We used resonant ultrasound spectroscopy with laser-Doppler interferometry, where the resonant-mode identification was unambiguously made by comparing measured and calculated displacement distributions on the vibrating specimen surface. Using more than 110 resonance frequencies, we inversely determined the Cij: C11 = 242.8 ± 2.9, C22 = 343.8 ± 3.8, C33 = 347.4 ± 2.5, C44 = 47.8 ± 0.2, C55 = 88.6 ± 0.5, C66 = 104.0 ± 0.5, C12 = 128 ± 0.1, C13 = 160 ± 1.5, C23 = 70.9 ± 2.1, C15 =-1.62 ± 0.05, C25 = 0.36 ± 0.01, C35 = 0.97 ± 0.03, and C46 = 5.59 ± 0.69 GPa. We also performed a density-functional-theory calculation and found that the local density approximation yields both the lattice parameters and Cij closer to the measurements than the generalized gradient approximation. Strong elastic-stiffness anisotropy is found in the diagonal elastic constants: C11 is smaller than C22 and C33 by ∼30%, and the difference between C44 and C66 exceeds 50%. Our measurements also reveal anomalous Poisson's ratios: ν21 and ν31 exceed 0.5, and ν23 and ν32 are almost zero. We explain these unusual elastic properties with the truss-like deformation of the tetrahedra-octahedra network and confirm this view with the ab-initio calculation.
Publisher	American Institute of Physics
Source Title	Journal of Applied Physics
Volume (Issue)	124(8)
Page	085102-1-085102-7
Date of Issued	2018-08-22
Language	English
Handle URL	https://hdl.handle.net/11094/84235
PISSN	00218979
eISSN	10897550
NCID	AA00693547
NCID	AA11868165
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1063/1.5047017
Access Rights	open access
CopyRight	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 124(8), 085102 (2018) and may be found at https://doi.org/10.1063/1.5047017.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Journal of Applied Physics. 2018, 124(8), p. 085102-1-085102-7
DC.title	Unusual elasticity of monoclinic β-Ga2O3
DC.creator	Adachi, K.
	Ogi, H.
	Takeuchi, N.
	Nakamura, N.
	Watanabe, H.
	Ito, T.
	Ozaki, Y.
DC.publisher	American Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2018-08-22
DC.identifier	https://doi.org/10.1063/1.5047017
DC.description	Adachi K., Ogi H., Takeuchi N., et al. "Unusual elasticity of monoclinic β-Ga2O3", Journal of Applied Physics, 124(8), 085102 (2018) https://doi.org/10.1063/1.5047017.
DCTERMS.abstract	This paper determines all the 13 elastic constants Cij of monoclinic β-Ga2O3, which has never been achieved since the discovery of this crystal about 100 years ago. We used resonant ultrasound spectroscopy with laser-Doppler interferometry, where the resonant-mode identification was unambiguously made by comparing measured and calculated displacement distributions on the vibrating specimen surface. Using more than 110 resonance frequencies, we inversely determined the Cij: C11 = 242.8 ± 2.9, C22 = 343.8 ± 3.8, C33 = 347.4 ± 2.5, C44 = 47.8 ± 0.2, C55 = 88.6 ± 0.5, C66 = 104.0 ± 0.5, C12 = 128 ± 0.1, C13 = 160 ± 1.5, C23 = 70.9 ± 2.1, C15 =-1.62 ± 0.05, C25 = 0.36 ± 0.01, C35 = 0.97 ± 0.03, and C46 = 5.59 ± 0.69 GPa. We also performed a density-functional-theory calculation and found that the local density approximation yields both the lattice parameters and Cij closer to the measurements than the generalized gradient approximation. Strong elastic-stiffness anisotropy is found in the diagonal elastic constants: C11 is smaller than C22 and C33 by ∼30%, and the difference between C44 and C66 exceeds 50%. Our measurements also reveal anomalous Poisson's ratios: ν21 and ν31 exceed 0.5, and ν23 and ν32 are almost zero. We explain these unusual elastic properties with the truss-like deformation of the tetrahedra-octahedra network and confirm this view with the ab-initio calculation.
DC.rights	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 124(8), 085102 (2018) and may be found at https://doi.org/10.1063/1.5047017.
DC.format	84235
citation_title	Unusual elasticity of monoclinic β-Ga2O3
citation_author	Adachi, K.
	Ogi, H.
	Takeuchi, N.
	Nakamura, N.
	Watanabe, H.
	Ito, T.
	Ozaki, Y.
citation_publisher	American Institute of Physics
citation_language	English
citation_date	2018-08-22
citation_journal_title	Journal of Applied Physics
citation_volume	124
citation_issue	8
citation_firstpage	085102-1
citation_lastpage	085102-7
citation_doi	https://doi.org/10.1063/1.5047017
citation_public_url	https://hdl.handle.net/11094/84235

Unusual elasticity of monoclinic β-Ga2O3

Link to primary information

Item Information

Show details