High‐pressure and high‐temperature study of phase transitions in solid germanium

Cicco, Andrea Di; Frasini, Anna Chiara; Minicucci, Marco; Principi, Emiliano; Itié, Jean‐Paul; Munsch, P.

doi:10.1002/pssb.200301847

Cited by 38 publications

(28 citation statements)

References 25 publications

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“…Details are discussed in a separate publication [15]. The volume thermal expansion measured in this work is found to be in the same range of that measured for b-Sn at ambient temperature [see Ref.…”

Section: Resultsmentioning

confidence: 61%

“…The Ge I (diamond) and Ge II (b-Sn) structures coexist in a wide region of pressures, as shown in Figure 2, both upon pressurization and depressurization cycles [see Ref. 15 for full details]. Coexistence of phases is obviously favored under non-hydrostatic conditions but it has been always observed in previous works.…”

Section: Resultsmentioning

confidence: 88%

“…Accurate energy-dispersive X-ray diffraction (EDXD) patterns of c-Ge have been collected using a diamond anvil cell (DAC) up to 500 K at beamline DW11 (LURE) [see Ref. 15 for a full report]. The measurements of aGe reported in this article take advantage of further experimental advances at BM29 related to the development of a novel multi-channel detector-collimator allowing simultaneous performance of energy-scanning XRD and X-ray absorption measurements [16].…”

Section: Introductionmentioning

confidence: 99%

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Structure of crystalline and amorphous Ge probed by X-ray absorption and diffraction techniques

Cicco

Principi

Minicucci

et al. 2004

High Pressure Research

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Results of experiments dedicated to the study of the structure under high pressure of amorphous Ge (a-Ge) and crystalline Ge (c-Ge) are reported. Energy-dispersive X-ray diffraction measurements of c-Ge have been collected at the DW11A beamline (DCI, LURE) using a heatable diamond anvil cell as pressure device up to 500 K. The a-Ge measurements have been performed at the ESRF, using the advanced set-up available at the BM29 beamline, which allows the simultaneous collection of X-ray absorption spectroscopy data and diffraction patterns used to monitor pressure and crystallization of a sample in a Paris-Edinburgh large-volume cell. The new structural data allowed us to obtain a reliable determination of the lattice parameters as a function of pressure and temperature in c-Ge and of the first-neighbor distance distribution in a-Ge

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Structure of crystalline and amorphous Ge probed by X-ray absorption and diffraction techniques

Cicco

Principi

Minicucci

et al. 2004

High Pressure Research

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“…Changes in near edge region are observed above 11 GPa because of a structural transition from a cubic diamond phase to a tetragonal β-Sn phase [8][9][10] . The large energy decrease (∼ 1 eV) around 11 GPa in the pressure evolution of the absorption edge in Fig.2 (b), is consistent with the semiconductor to metal transition occurring simultaneously with the structural transformation [8][9][10] . The EXAFS signal χ(k), was obtained by subtracting the embedded-atom absorption background from the measured absorption coefficient and normalizing by the edge step.…”

Section: Experimental Results and Quantitative Data Analysismentioning

confidence: 99%

“…Crystalline Ge was chosen as a reference system since the structural transition observed at approximately 11 GPa has been widely investigated [8][9][10] . We demonstrate that the use of ND addresses the problem caused by diamond glitches.…”

Section: Introductionmentioning

confidence: 99%

High-pressure EXAFS measurements of crystalline Ge using nanocrystalline diamond anvils

et al. 2011

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High-pressure extended x-ray absorption fine structure (EXAFS) measurements on crystalline Ge demonstrate that the use of nano-crystalline diamond anvils can solve the glitch problem from single crystal diamond anvils and improve the quality of the data. Our results indicate that using nanocrystalline diamond anvils for high pressure EXAFS research can provide a large enough energy range for structural study up to four coordination shell distances. In particular, we obtained the pressure evolution of mean square relative displacement for the first neighbor shells of crystalline Ge and observed a different correlation effects for different coordination shells. The use of nanocrystalline diamond anvils will provide a breakthrough for high pressure EXAFS study, especially for amorphous compounds in which only limited structural information can be obtained by diffraction techniques.

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An Unexpected Cubic Symmetry in Group IV Alloys Prepared Using Pressure and Temperature

et al. 2021

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The cubic diamond (Fd3m) group IVAe lement Si has been the material driver of the electronics industry since its inception. We report synthesis of an ew cubic (Im3m) group IVAmaterial, aGeSn solid solution, upon heating Ge and Sn at pressures from 13 to 28 GPausing double-sided diamond anvil laser-heating and large volume press methods.B oth methods were coupled with in situ angle dispersive X-ray diffraction characterization. The new material substantially enriches the seminal group IVAalloymaterials landscape by introducing an eightfold coordinated cubic symmetry,w hichm arkedly expands on the conventional tetrahedrally coordinated cubic one. This cubic solid solution is formed, despite Ge never adopting the Im3ms ymmetry,m elting inhibiting subsequent Im3m formation and reactant Ge and Sn having unlike crystal structures and atomic radii at all these pressures.This is hence achieved without adherence to conventional formation criteria and routes to synthesis.This advance creates fertile avenues for new materials development.

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High‐pressure and high‐temperature study of phase transitions in solid germanium

Cited by 38 publications

References 25 publications

Structure of crystalline and amorphous Ge probed by X-ray absorption and diffraction techniques

Structure of crystalline and amorphous Ge probed by X-ray absorption and diffraction techniques

High-pressure EXAFS measurements of crystalline Ge using nanocrystalline diamond anvils

An Unexpected Cubic Symmetry in Group IV Alloys Prepared Using Pressure and Temperature

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