Micro-Raman mapping and analysis of indentation-induced phase transformations in germanium

Jae-il Jang, M. J. Lance, Songqing Wen, J. J. Huening, R. J. Nemanich, G. M. Pharr

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

Although it has been confirmed by diamond anvil cell experiments that germanium transforms under hydrostatic pressure from the normal diamond cubic phase (Ge-I) to the metallic β-tin phase (Ge-II) and re-transforms to Ge-III (ST12 structure) or Ge-IV (BC8 structure) during release of the pressure, there are still controversies about whether the same transformations occur during nanoindentation. Here, we present new evidence of indentation-induced phase transformations in germanium. Nanoindentation experiments were performed on a (100) Ge single crystal using two triangular pyramidal indenters with different tip angles - the common Berkovich and the sharper cube-corner. Although the indentation load-displacement curves do not show any of the characteristics of phase transformation that are well-known for silicon, micro-Raman spectroscopy in conjunction with scanning electron microscopy reveals that phase transformations to amorphous and metastable crystalline phases do indeed occur. However, the transformations are observed reproducibly only for the cube-corner indenter.

Original languageEnglish
Article numberR10.9/T6.9
Pages (from-to)291-296
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume841
StatePublished - 2005 Aug 25
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 3

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Germanium
indentation
Indentation
phase transformations
germanium
Diamond
Phase transitions
Nanoindentation
nanoindentation
Diamonds
diamonds
Tin
Silicon
Hydrostatic pressure
anvils
hydrostatic pressure
Raman spectroscopy
tin
Experiments
Mathematical transformations

Cite this

Jang, J., Lance, M. J., Wen, S., Huening, J. J., Nemanich, R. J., & Pharr, G. M. (2005). Micro-Raman mapping and analysis of indentation-induced phase transformations in germanium. Materials Research Society Symposium Proceedings, 841, 291-296. [R10.9/T6.9].
Jang, Jae-il ; Lance, M. J. ; Wen, Songqing ; Huening, J. J. ; Nemanich, R. J. ; Pharr, G. M. / Micro-Raman mapping and analysis of indentation-induced phase transformations in germanium. In: Materials Research Society Symposium Proceedings. 2005 ; Vol. 841. pp. 291-296.
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Jang, J, Lance, MJ, Wen, S, Huening, JJ, Nemanich, RJ & Pharr, GM 2005, 'Micro-Raman mapping and analysis of indentation-induced phase transformations in germanium', Materials Research Society Symposium Proceedings, vol. 841, R10.9/T6.9, pp. 291-296.

Micro-Raman mapping and analysis of indentation-induced phase transformations in germanium. / Jang, Jae-il; Lance, M. J.; Wen, Songqing; Huening, J. J.; Nemanich, R. J.; Pharr, G. M.

In: Materials Research Society Symposium Proceedings, Vol. 841, R10.9/T6.9, 25.08.2005, p. 291-296.

Research output: Contribution to journalConference article

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AU - Jang, Jae-il

AU - Lance, M. J.

AU - Wen, Songqing

AU - Huening, J. J.

AU - Nemanich, R. J.

AU - Pharr, G. M.

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