29Si NMR structural studies of ionically conductive silicon chalcogenide glasses and model compounds

Pradel, Annie; Taillades, Gilles; Ribes, M.; Eckert, Hellmut

doi:10.1016/0022-3093(94)00662-8

Cited by 54 publications

(85 citation statements)

References 34 publications

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“…The intense peak in the C structure, similar to that observed for HT-and LT-Li 2 SiS 3 , reveals a proportion of non-bridging sulphur atoms similar in the glass and the crystal; a similar conclusion was drawn from the analysis of the S 2p core peak [22]. The high binding energy part of the C structure is less defined, probably in relation with a more disordered structure (dispersion of the Si-S bond lengths) in the glass than in the crystal in agreement with NMR results [23].…”

Section: Thiosilicate Compoundssupporting

confidence: 85%

“…Concerning Na 2 SiS 3 glass, the intermediate intensity of the B massif, compared to the two crystalline phases, suggests a structure with some proportion of edge-sharing tetrahedral, in agreement with 29 Si NMR studies [23].…”

Section: Thiosilicate Compoundssupporting

confidence: 58%

“…In particular it is much more intense for HT-Na 2 SiS 3 than for LTNa 2 SiS 3 . This result leads to propose a structure with a majority of edge-sharing tetrahedra for the high-temperature phase while the structure of the low-temperature phase would contain a majority of corner-sharing tetrahedra, in agreement 29 Si NMR studies [23].…”

Section: Thiosilicate Compoundsmentioning

confidence: 55%

“…Neutron diffraction studies, NMR, Raman, IR, etc. analyses have also been carried out in order to probe the local and intermediate range structure in these glasses [13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

et al. 2006

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Section: Thiosilicate Compoundssupporting

confidence: 85%

Section: Thiosilicate Compoundssupporting

confidence: 58%

Section: Thiosilicate Compoundsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

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XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

et al. 2006

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“…A radically different situation is encountered in systems with modifier cations of smaller sizes (M=Li) or in thiosilicates (X=S) and seleniosilicates (X=Se) [22]. Certain of these glass networks can be indeed made out of Q 4 and Q 2 species only or, at least, of a mixture of all Q n 's.…”

mentioning

confidence: 99%

Rigidity and intermediate phases in glasses driven by speciation

Micoulaut

2006

Phys. Rev. B

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The rigid to floppy transitions and the associated intermediate phase in glasses are studied in the case where the local structure is not fully determined from the macroscopic concentration. The approach uses size increasing cluster approximations and constraint counting algorithms. It is shown that the location and the width of the intermediate phase and the corresponding structural, mechanical and energetical properties of the network depend crucially on the way local structures are selected at a given concentration. The broadening of the intermediate phase is obtained for networks combining a large amount of flexible local structural units and a high rate of medium range order.PACS numbers: 61.43. Concepts from mean-field rigidity in networks found their origin from Lagrangian constraint counting in mechanics [1] and have been applied with great success in glass science for several decades [2]. Bonds in a glass network can indeed be considered as constraints arising from interatomic stretching and bending forces. The connectivity or cross-link density (best quantified by the network mean coordination numberr) plays therefore a key role. In highly cross-linked networks wherer is large, there are more constraints than degrees of freedom per atom on average and the structure is stressed rigid (hyperstatic or overconstrained). At low connectivity, one has a flexible (hypostatic or underconstrained) structure that contains more degrees of freedom than constraints. Thorpe [3] analyzed the vibrational behaviour of such kind of networks and identified a mean-field (MF) floppy to rigid transition when the mean coordination number equalsr =r c = 2.38, a result that agrees with global (Maxwell) constraint counting as enunciated by Phillips [4] from the enumeration n c of bond stretching and bond bending forces.The underlying nature of this peculiar transition has been deeply reinvestigated recently because two transitions atr c(1) andr c(2) have been found [5] experimentally in a variety of glasses. These define an intervening region (or intermediate phase, (IP)) between the floppy and the stressed rigid phase. In the IP, glasses display some remarkable properties such as absence of ageing [6] or stress [7], selection of isostatically rigid local structures [5] or weak birefringence [8]. The two boundaries have been characterized from numerical calculations [9] and cluster analysis [10] on self-organized networks and identified as being a rigidity transition at lowr and a stress transition at highr. In the mean-field approach or in random networks where self-organization does not take place, both transitions coalesce into a single one. Moreover, links between IP and protein folding [11], high-temperature superconductors [12] or computational phase transitions [13] have been stressed that go much beyond simple analogies. The understanding of the IP is therefore of general interest. It has become clear that stress avoidance in the network is responsable for the width ∆r =r c(2) −r c(1) and the location of the intermed...

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NMR Studies of Oxide Glass Structure

Stebbins¹

2001

Solid‐State NMR Spectroscopy Principles and Applications

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29Si NMR structural studies of ionically conductive silicon chalcogenide glasses and model compounds

Cited by 54 publications

References 34 publications

XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

Rigidity and intermediate phases in glasses driven by speciation

NMR Studies of Oxide Glass Structure

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