Thermal stability of simple tetragonal and hexagonal diamond germanium

dc.contributor.authorHuston, Larissaen_AU
dc.contributor.authorJohnson, B. C.
dc.contributor.authorHaber, Bianca
dc.contributor.authorWong, S.
dc.contributor.authorWilliams, J. S.
dc.contributor.authorBradby, Jodie
dc.date.accessioned2019-01-04T04:27:07Z
dc.date.available2019-01-04T04:27:07Z
dc.date.issued2017
dc.description.abstractExotic 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.sponsorshipThis 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.mimetypeapplication/pdfe_AU
dc.identifier.issn0021-8979en_AU
dc.identifier.urihttp://hdl.handle.net/1885/155077
dc.provenancehttp://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.publisherAIP Publishingen_AU
dc.sourceJournal of Applied Physicsen_AU
dc.titleThermal stability of simple tetragonal and hexagonal diamond germaniumen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue17en_AU
local.bibliographicCitation.startpage175108en_AU
local.contributor.affiliationHuston, L. Q., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.affiliationHaberl, B., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.affiliationWong, S., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.affiliationWilliams, J. S., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.affiliationBradby, J. E., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.authoremaillarissa.huston@anu.edu.auen_AU
local.contributor.authoruidu5008495en_AU
local.identifier.citationvolume122en_AU
local.identifier.doi10.1063/1.5002705en_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttps://www.aip.org/en_AU
local.type.statusPublished Versionen_AU
local.type.statusPublished Version

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