Structure of GeS<i>sub2</i>glass: Spectroscopic evidence for broken chemical order

Boolchand, P.; Grothaus, J. T.; Tenhover, M.; Hazle, M. A.; Grasselli, Robert K.

doi:10.1103/physrevb.33.5421

Cited by 131 publications

(121 citation statements)

References 32 publications

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“…This suggests that the number of the tetrahedral unit decreases with increasing Ge composition. At Ge 36 %, the content of A phase is 0 % [2]. Therefore, the peak at 340 cm -1 in the spectrum at Ge 36 % should have other structural origin.…”

Section: Methodsmentioning

confidence: 99%

“…The change in the bond angle from Ge 33 to 50 % can be explained in terms of the atomic orbital theory. The outermost electronic configuration of Ge is (4s) 2 (4p) 2 and that of Se is (4s) 2 (4p) 4 . In Se atom, two s electrons are low in energy and they do not participate in bonding.…”

Section: B Formation Of Layer Structurementioning

confidence: 99%

“…In the past few decades there has been an extensive effort to investigate the structure of the glassy Gechalcogenides. Results of several measurements have shown that a structural transition occurs with increasing Ge composition 1,2 . According to the results of Mössbauer spectroscopy by Boolchand et al 2 , at high Ge concentration there are three structural phases, A, B and C, in these glasses.…”

Section: Introductionmentioning

confidence: 99%

“…Results of several measurements have shown that a structural transition occurs with increasing Ge composition 1,2 . According to the results of Mössbauer spectroscopy by Boolchand et al 2 , at high Ge concentration there are three structural phases, A, B and C, in these glasses. A phase has similar structure to the high temperature crystalline phase of GeX 2 , which consists of tetrahedral Ge(X 1/2 ) 4 units.…”

Section: Introductionmentioning

confidence: 99%

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Structural development in Ge-rich Ge–S glasses

Sakaguchi

Ténné

Mitkova

2009

Journal of Non-Crystalline Solids

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This is an author-produced, peer-reviewed version of this article. AbstractThe Raman spectra of Ge-S glasses in the Ge-rich region from Ge 33 to 46 % have been investigated in order to know the structural development of the network glasses. From the detailed curve fits, we have found that there is an unassigned peak at 410 cm -1 and it becomes larger with increasing Ge composition. To clarify the structural origin of the peak, we virtually constructed the atomic arrangement of the glassy state starting from the crystalline state through the liquid state and changed the composition gradually depleting the medium in sulfur. From the consideration of the structural modeling and the atomic orbital theory, we suggest that single Ge-S chain is a probable structural origin of the peak.

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Section: Methodsmentioning

confidence: 99%

Section: B Formation Of Layer Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural development in Ge-rich Ge–S glasses

Sakaguchi

Ténné

Mitkova

2009

Journal of Non-Crystalline Solids

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“…͑While the structure of As 2 S 3 glass is dominated by As-S-As-S rings with bridging and nonbridging sulfur atoms, 12,15 the structure of stoichiometric germanium sulfide glasses is dominated by GeS 1 tetrahedra ͑see, e.g., Ref. 16 and refs therein͒ and the structure of Ge-enriched germanium sulfide glasses is dominated by Ge-S-Ge-S chains. 11,16 Strengthening of secondary bonds should result in weakening of the primary bonds 7 what can result in the volume expansion.…”

Section: Discussionmentioning

confidence: 99%

Light-induced relief gratings and a mechanism of metastable light-induced expansion in chalcogenide glasses

et al. 2001

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We report on a metastable light-induced volume expansion in Ge 25ϩx Ga 10Ϫx S 65 glasses under irradiation with band gap ͑UV͒ light, which can result in recording of relief gratings on their surface in the case of irradiation with two interfering beams. We propose a mechanism for the expansion, which is based on the light-induced change in the polarizability of secondary ͑van der Waals type͒ bonds and the effect of this change on primary ͑covalent type͒ bonds of the glass. The effect is suggested to be due to an interference of electrons, which belong to a chalcogen atom and participate in the formation of secondary and primary bonds, respectively. We suggest that a minimum point of the Lennard-Jones potential, which corresponds to the equilibrium position of a chalcogen atom is shifted in the course of irradiation to a larger interatomic distance. This shift causes a volume expansion and allows a diffusion of chalcogen atoms into the irradiated area. We show that light-induced polymerization of the glass network is an important attribute of the light-induced volume expansion.

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