Thermal stability of simple tetragonal and hexagonal diamond germanium
dc.contributor.author | Huston, Larissa | en_AU |
dc.contributor.author | Johnson, B. C. | |
dc.contributor.author | Haber, Bianca | |
dc.contributor.author | Wong, S. | |
dc.contributor.author | Williams, J. S. | |
dc.contributor.author | Bradby, Jodie | |
dc.date.accessioned | 2019-01-04T04:27:07Z | |
dc.date.available | 2019-01-04T04:27:07Z | |
dc.date.issued | 2017 | |
dc.description.abstract | Exotic phases of germanium, that form under high pressure but persist under ambient conditions, are of technological interest due to their unique optical and electrical properties. The thermal evolution and stability of two of these exotic Ge phases, the simple tetragonal (st12) and hexagonal diamond (hd) phases, are investigated in detail. These metastable phases, formed by high pressure decompression in either a diamond anvil cell or by nanoindentation, are annealed at temperatures ranging from 280 to 320 C for st12-Ge and 200 to 550 C for hd-Ge. In both cases, the exotic phases originated from entirely pure Ge precursor materials. Raman microspectroscopy is used to monitor the phase changes ex situ following annealing. Our results show that hd-Ge synthesized via a pure form of a-Ge first undergoes a subtle change in structure and then an irreversible phase transformation to dc-Ge with an activation energy of (4.3 6 0.2) eV at higher temperatures. St12-Ge was found to transform to dc-Ge with an activation energy of (1.44 6 0.08) eV. Taken together with results from previous studies, this study allows for intriguing comparisons with silicon and suggests promising technological applications. | en_AU |
dc.description.sponsorship | This work was supported by the Australian Research Council under the Discovery Project Scheme. L.Q.H. is supported by an Australian Government Research Training Program Scholarship. J.E.B. acknowledges the ARC for the award of a Future Fellowship. B.H. was supported through a Weinberg Fellowship (ORNL) and the Neutron Scattering User Facilities (ORNL), supported by the U.S. Department of Energy, Office of Sciences, Basic Energy Sciences. The ORNL is funded under DOE-BES Contract No. DE-AC05-00OR22725 and the Alvin M. Weinberg Fellowship by the ORNL LDRD scheme under Project No. 7620. | en_AU |
dc.format.mimetype | application/pdf | e_AU |
dc.identifier.issn | 0021-8979 | en_AU |
dc.identifier.uri | http://hdl.handle.net/1885/155077 | |
dc.provenance | http://www.sherpa.ac.uk/romeo/issn/0021-8979/..."Publishers version/PDF may be used on author's personal website, arXiv, institutional website, institutional repository, funders designated repository or private forums on social academic network after 12 months embargo" from SHERPA/RoMEO site (as at 04/01/19). | |
dc.publisher | AIP Publishing | en_AU |
dc.source | Journal of Applied Physics | en_AU |
dc.title | Thermal stability of simple tetragonal and hexagonal diamond germanium | en_AU |
dc.type | Journal article | en_AU |
dcterms.accessRights | Open Access | en_AU |
local.bibliographicCitation.issue | 17 | en_AU |
local.bibliographicCitation.startpage | 175108 | en_AU |
local.contributor.affiliation | Huston, L. Q., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University | en_AU |
local.contributor.affiliation | Haberl, B., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University | en_AU |
local.contributor.affiliation | Wong, S., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University | en_AU |
local.contributor.affiliation | Williams, J. S., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University | en_AU |
local.contributor.affiliation | Bradby, J. E., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University | en_AU |
local.contributor.authoremail | larissa.huston@anu.edu.au | en_AU |
local.contributor.authoruid | u5008495 | en_AU |
local.identifier.citationvolume | 122 | en_AU |
local.identifier.doi | 10.1063/1.5002705 | en_AU |
local.identifier.uidSubmittedBy | u1005913 | en_AU |
local.publisher.url | https://www.aip.org/ | en_AU |
local.type.status | Published Version | en_AU |
local.type.status | Published Version |