A study of selected physical properties of alkali germanate glasses over wide ranges of composition

Kiczenski, T. J.; Ma, C.; Hammarsten, E. C.; Wilkerson, Doug; Affatigato, Mario; Feller, Steve

doi:10.1016/s0022-3093(00)00158-7

Cited by 40 publications

(46 citation statements)

References 10 publications

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“…With the Oeffner-Elliot potential, a T g of 900 K, is found from the inflexion point of the potential energy. This value is close to the experimental derived T g (850 K, [125]). This appears to be rather unusual as MD simulations on similar systems [126], [127] predict much higher glass transition temperatures than the corresponding experimental ones.…”

Section: Glass Transition Problem Of Strong Glassessupporting

confidence: 90%

The structure of amorphous, crystalline and liquid GeO₂

Micoulaut

Cormier

Henderson

2006

J. Phys.: Condens. Matter

232

252

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Abstract. Germanium dioxide (GeO 2 ) is a chemical analogue of SiO 2 . Furthermore, it is also to some extent a structural analogue, as the low and high-pressure short-range order (tetrahedral and octahedral) is the same. However, a number of differences exist. For example, the GeO 2 phase diagram exhibits a smaller number of polymorphs, and all three GeO 2 phases (crystalline, glass, liquid) have an increased sensitivity to pressure, undergoing pressure induced changes at much lower pressures than their equivalent SiO 2 analogues. In addition, differences exist in GeO 2 glass in the medium range order, resulting in the glass transition temperature of germania being much lower than for silica. This review highlights the structure of amorphous GeO 2 by different experimental (e.g., Raman and NMR spectroscopy, neutron and x-ray diffraction) and theoretical methods (e.g., classical molecular dynamics, ab initio calculations). It also addresses the structure of liquid and crystalline GeO 2 that have received much less attention. Furthermore, we compare and contrast the structural differences between GeO 2 and SiO 2 , as well as, along the GeO 2 − SiO 2 join. It is probably a very timely review as interest in this compound, that can be investigated in the liquid state at relatively low temperatures and pressures, continues to increase.

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Section: Glass Transition Problem Of Strong Glassessupporting

confidence: 90%

The structure of amorphous, crystalline and liquid GeO₂

Micoulaut

Cormier

Henderson

2006

J. Phys.: Condens. Matter

232

252

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“…Based on their Raman spectra, they suggested that the anomaly is associated with the longer T-O (where T is the tetrahedral cation) distances of GeO 4 tetrahedra (relative [2,3,5,27,33]. The data from Reibling [27] have been calculated for a temperature of 300 K while the 'J value' of Kiczenski et al [33] has been converted to mol%.…”

Section: Structural Modelsmentioning

confidence: 99%

“…Note that the compositions are beyond the anomaly maximum at $10 mol% K 2 O and are on the down slope of the density. Density data are from Ivanov and Evstropiev [2], Riebling [27] calculated for 300 K, Murthy and Ip [3], Kiczenski et al [33] and Henderson and Wang [5]. two distinct Ge-O distances characteristic of two different Ge coordination geometries but the density of the 20 mol% K 2 O composition is less than for the 11 mol% composition.…”

Section: Structural Modelsmentioning

confidence: 99%

The Germanate Anomaly: What do we know?

Henderson

2007

Journal of Non-Crystalline Solids

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“…Both predictions are in reasonable agreement with the data (fig.1). The broad global minimum in molar volumes near x ~18%, identified with the Germanate anomaly, has been attributed by some 13,14,22 to an aspect of local structure , i.e., Ge coordination number increase. On the other hand, Henderson 13 has suggested that the anomaly comes from growth of small (GeO) n rings, n = 3-and 4-member at the expense of larger ones, a feature of medium range structure.…”

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confidence: 99%