Devitrification of the Li<sub>2</sub>O – x(GeO<sub>2</sub>) Glass

Volnianskii, M. D.; Nesterov, О. O.; Trubitsyn, M. P.

doi:10.1080/00150193.2014.895173

Cited by 9 publications

(11 citation statements)

References 5 publications

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“…The values of ∆ were estimated from AFM images as ratio of total area occupied by nuclei to the area of studied surface. One can see that in glass state a small part of the sample surface is occupied by nanosized nuclei, which can be attributed to Li 2 Ge 7 O 15 phase in accordance with [17]. In the intermediate state, the nuclei are approximately twice larger and occupy about three quarters of the sample surface.…”

Section: Morphology Of the States Appearing At Glass Crystallizationmentioning

confidence: 53%

“…Presence of two DSC peaks demonstrates that amorphous phase of Li 2 O-7GeO 2 crystallizes in two stages. Structures of the phases crystallized at T 1 and T 2 were studied by X-ray phase analysis [17]. It was shown ( Fig.…”

Section: Calorimetry Of Glass Crystallizationmentioning

confidence: 99%

“…When the sample is heated above T 2 , an abrupt and irreversible decrease of σ manifests a completion of the crystallization process and a formation of Li 2 Ge 7 O 15 polycrystal (dependence 3 in Fig. 3) [17].…”

Section: Electrical Conductivitymentioning

confidence: 99%

“…Preparation of the Li 2 O-xGeO glasses and their devitrification on heating was reported in [12][13][14][15][16][17]. It was shown that with increasing temperature the amorphous compounds with x>3 crystallized in stages through intermediate state.…”

Section: Introductionmentioning

confidence: 99%

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Ionic Conductivity in Multiphase Li₂O-7GeO₂Compounds

et al. 2018

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Crystallization of Li2O-7GeO2 glass was carried out on heating, simultaneously differential scanning calorimetry and electric properties were studied. Morphology of the phase states obtained at glass devitrification was examined by atomic force microscopy. It was shown that amorphous phase of Li2O-7GeO2 was crystallized in stages through the intermediate state with increased conductivity σ. In the intermediate state the sample volume was occupied by nanometer-sized nuclei with ordered structure surrounded by internuclear amorphous medium. Complete glass crystallization occurred through transformation of nanometer-sized nuclei into micrometer-sized crystallites and was accompanied by a sharp and irreversible decrease of conductivity. Atomic force microscopy of the samples heat-treated in different ways showed that Li2O-7GeO2 glass crystallization was suppressed near the surface and mainly proceeded within the sample bulk. Charge transfer in amorphous, nanocrystalline intermediate and polycrystalline phases of Li2O-7GeO2 was associated with motion of the weakly bound Li ions.

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Section: Morphology Of the States Appearing At Glass Crystallizationmentioning

confidence: 53%

Section: Calorimetry Of Glass Crystallizationmentioning

confidence: 99%

Section: Electrical Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ionic Conductivity in Multiphase Li₂O-7GeO₂Compounds

et al. 2018

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“…Pure and doped with Cr (0.06 wt%) and Mn (0.06 wt%) lithium heptagermanate glasses were obtained by quenching the melts as described in [2][3][4]. The estimated quenching rate was about ~10 3 K/s.…”

Section: Resultsmentioning

confidence: 99%

Conductivity of lithium heptagermanate glasses and single crystals doped with 3d- ions

et al. 2018

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Lithium heptagermanate Li2Ge7O15 glasses doped with Cr and Mn were prepared by the melt quenching. Electrical conductivity σ of pure and doped glasses was measured in AC field (f=1 kHz) within the temperature range 300-700 K. It is shown that both impurities increase conductivity of the glasses. The influence of Cr doping is very subtle whereas the maximal effect is observed for the Li2Ge7O15:Mn glass. The obtained data are compared with the results of measuring σ in Li2Ge7O15:Cr, Mn single crystals. It is noted that doping affects σ of the glasses and single crystals in different ways. In particular, the conductivity of the single crystals can be controlled by doping in a wide range: introducing Cr impuritystrongly increases σ and vice versa doping with Mn sufficiently decreases σ value. Doping effect is interpreted on the basis of the previous EPR data giving information on the location of Cr and Mn centers in the Li2Ge7O15 structure. Cr ions substitute for Ge ions and are fixed within oxygen octahedra. On the other hand, Mn ions are located within the cavities formed by Ge‒O structural framework and are assumed to be mobile enough to contribute to charge transfer.

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