Pressure-Induced Amorphization of GeSe2

Simulation of pressure-induced polyamorphism in a chalcogenide glassGeSe2

“…The bands shift to higher frequencies with pressure without softening modes, as reported in the Raman spectra of ␤-GeSe 2 . 13 The same behavior was reported in theoretical 37 and experimental 38,39 studies of SiO 2 . On the other hand, the modes of a-Si ͑Ref.…”

“…In an experimental study of pressure-induced amorphization of GeSe 2 , it is reported that the Raman spectrum of the decompressed sample does not show the presence of the vibrational modes at about 180 cm Ϫ1 , indicating that pressure suppresses Ge-Ge bonding. 13 At 13 GPa, the number of Ge involved in homopolar bonding rises suddenly from ϳ16.66% to ϳ26.28%, where the pressure-volume curve shows the first discontinuity. After 20 GPa, it increases gradually with pressure.…”

“…Based on the experiments, it is argued that possible structural transitions in glassy GeSe 2 , at high pressure and high temperature, could be similar to the ones in crystalline GeSe 2 . 13 In this paper, we present an ab initio constant pressure molecular dynamics ͑MD͒ study of a semiconductor-to-metal transition in a-GeSe 2 , using a relatively large 216-atom realistic model. To our knowledge, this is the first direct MD simulation to model the pressure-induced phase transition in a-GeSe 2 .…”

Thermoreflectance study of the electronic structure ofGe(Se1−xSx)2

“…[8][9][10][11][12] Because of their interesting physical properties, chalcogenides GeX 2 ͑X =S,Se͒ have the potential to be used as the photosensitive media for optical recording, 13 as light guides, 14 as high-resolution inorganic photoresistors, 15 as photoinduced transformation devices, 16 or as antireflection coatings. 14 All the prospective applications of GeS 2 and GeSe 2 have led many researchers to study the material properties of the glassy and crystalline forms of the chalcogenides.…”

Characterization of Ge(Se1−xSx)2 series layered crystals grown by vertical Bridgman method

“…Previous efforts on the layered germanium dichalcogenide had almost concentrated on binary amorphous and crystalline compounds (i.e. GeSe 2 , GeS 2 and GeSe) [1][2][3][4][5][6][7][8][9][10][11][12][13][14]17]. On the other hand, the solid-state properties of the crystalline ternary Ge(Se 1Àx S x ) 2 compounds are less known and understood.…”