2004
DOI: 10.1063/1.1712905
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Glass structure and ion dynamics of lead–cadmium fluorgermanate glasses

Abstract: Glass structure and fluorine motion dynamics are investigated in lead-cadmium fluorgermanate glasses by means of differential scanning calorimetry, Raman scattering, x-ray absorption ͑EXAFS͒, electrical conductivity ͑EC͒, and 19 F nuclear magnetic resonance ͑NMR͒ techniques. Glasses with composition 60PbGeO 3 -xPbF 2 -yCdF 2 ͑in mol %͒, with xϩyϭ40 and xϭ10, 20, 30, 40, are studied. Addition of metal fluorides to the base PbGeO 3 glass leads to a decrease of the glass transition temperature (T g ) and to an en… Show more

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Cited by 13 publications
(31 citation statements)
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References 51 publications
(79 reference statements)
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“…Increasing the total content of fluorine ions increases the conductivities. It is known that the addition of lead fluoride also leads to a decrease of glass transition (T g ) temperatures [6][7][8][9][10][11][12][13][14][15][16] due to the formation of non-bridging fluorine atoms (NBF) substituting for bridging oxygen atoms (BO). The increase in conductivity is a consequence of the changes in the glass structure.…”
Section: Discussionmentioning
confidence: 99%
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“…Increasing the total content of fluorine ions increases the conductivities. It is known that the addition of lead fluoride also leads to a decrease of glass transition (T g ) temperatures [6][7][8][9][10][11][12][13][14][15][16] due to the formation of non-bridging fluorine atoms (NBF) substituting for bridging oxygen atoms (BO). The increase in conductivity is a consequence of the changes in the glass structure.…”
Section: Discussionmentioning
confidence: 99%
“…19 F nuclear magnetic resonance (NMR), X-ray absorption (EXAFS) and Raman scattering results have been considered in the proposal of a structural model describing these glasses by a metagermanate chain structure which permeates fluorine rich regions [16]. This particular structural model for fluorine clustering could well be extended to other oxide based hosts and explain increased mobility observed for fluorine ions and also the particular crystallization properties [2,7,15].…”
Section: Introductionmentioning
confidence: 97%
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“…The low temperature 19 F second moments of the glasses 60PbGeO 3 -xPbF 2 y-CdF 2 , with x + y = 40 and x = 10, 20, 30, 40 (in mol %), indicates that the fluorine ions were not uniformly distributed through the material. The NMR data, along with those of Raman and Exafs, provided the basis for a model of the glass structure at the molecular scale, described by fluorine rich regions permeating the metagermanate chain structures with F-F distances comparable to those found in crystallyne phases [25]. Figure 3 shows the temperature dependence of the 7 Li central transition line-width, without decoupling, in the three Li 0.1 MoS 2 [X] nanocomposites.…”
Section: Resultsmentioning
confidence: 99%
“…Another interesting kind of materials, where the experimental determination of the second moment provides important microscopic structural information, are the fluorogermanate glasses [25]. The low temperature 19 F second moments of the glasses 60PbGeO 3 -xPbF 2 y-CdF 2 , with x + y = 40 and x = 10, 20, 30, 40 (in mol %), indicates that the fluorine ions were not uniformly distributed through the material.…”
Section: Resultsmentioning
confidence: 99%