1990
DOI: 10.1021/j100366a012
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X-ray absorption fine-structure study of amorphous germanium under high pressure

Abstract: 1087example, we have not determined yet whether in the process of observing phonon-assisted laser operation macroscopic occupation of a phonon mode occurs and whether we are operating a phonon oscillator. High-pressure measurements, among others, may help resolve these questions. In previous high-pressure measurements on QWHs we (N.H.) with H. Drickamer and our students have been able to probe, because of easily resolved confined-particle exciton states, the "inside" of an energy band and not just the band edg… Show more

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Cited by 29 publications
(22 citation statements)
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“…In previous papers [7,10], the precision in the XAS measurements and related determination of bond distances was insufficient to reveal such a change in the structure, but in the present case the typical error bar is estimated to be below 0.005 Å , precise enough to reveal FIGURE 3 XAS K-edge w(k) spectra of a-Ge at room temperature for increasing pressure (from the top to the bottom). The estimated uncertainty on measured pressures is AE0.1 GPa.…”
mentioning
confidence: 60%
See 1 more Smart Citation
“…In previous papers [7,10], the precision in the XAS measurements and related determination of bond distances was insufficient to reveal such a change in the structure, but in the present case the typical error bar is estimated to be below 0.005 Å , precise enough to reveal FIGURE 3 XAS K-edge w(k) spectra of a-Ge at room temperature for increasing pressure (from the top to the bottom). The estimated uncertainty on measured pressures is AE0.1 GPa.…”
mentioning
confidence: 60%
“…In amorphous Ge (a-Ge), pressurization induces modifications of the structure [6][7][8][9][10] still not completely understood.…”
Section: Introductionmentioning
confidence: 99%
“…The compressibility of a coordination polyhedron of an X-ray absorbing atom can be determined by EXAFS. Some EXAFS studies on crystalline and amorphous Ge under pressure have already been presented in the literature (Kawamura et al, 1981;Shimomura & Kawamura, 1987;Freund et al, 1990). It was demonstrated by Freund et al (1990) that the local compressibility of a single GeÐGe bond in amorphous Ge is about 30% smaller than the bulk compressibility of the crystalline phase.…”
Section: Introductionmentioning
confidence: 99%
“…On the other hand, no significant structural changes were found in Ref. [3]. The differences among these experiments are understood in terms of the differences in the experimental conditions.…”
Section: Discussionmentioning
confidence: 76%
“…In order to elucidate the high-pressure behavior of aGe, several experimental studies have been put forward [1][2][3]. The results of these studies imply that, depending on the sample preparation and pressure-loading conditions, it is possible that different types of high-pressure structures realize.…”
Section: Introductionmentioning
confidence: 99%