Structure and Optical Conductivity of Silver Thiogermanate Glasses

Kamitsos, E. I.; Kapoutsis, J. A.; Chryssikos, Georgios D.; Taillades, Gilles; Pradel, Annie; Ribes, M.

doi:10.1006/jssc.1994.1301

Cited by 55 publications

(59 citation statements)

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“…6, the highlighted region is related to terminal Ge-S vibration. These modes are assigned to vibration modes of different types of terminated S anion structure, including dithiogermanate for GeS 2.5 -, metathiogermanate for GeS 3 2-and pyrothiogermanate for GeS 3.5 3-respectively [8][9][10]. The total area ratio of those terminal Ge-S modes increases with Ag% monotonically and correlates well with EDS results.…”

Section: Ag Incorporation Level Determined From Raman and Edssupporting

confidence: 67%

Structural study of Ag-Ge-S solid electrolyte glass system for resistive radiation sensing

Chen

Ailavajhala

Mitkova

et al. 2011

2011 IEEE Workshop on Microelectronics and Electron Devices

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Abstract-Solid electrolytes based on chalcogenide glasses have been one of the most promising candidates for the next generation non-volatile memories. Here we propose a new application of chalcogenide solid electrolytes for low cost, high performance microelectronic radiation sensor that reacts to γ-radiation to produce an easily measurable change in electrical resistance. The active layer material is Ag-doped GeS thin film glasses and several compositions of GeS base glasses were tested for best resistive sensing capability. Energy-dispersive X-ray spectroscopy (EDS) was used for elemental analysis and Raman scattering spectroscopy was measured to determine the structural details and radiation induced structural changes. We also present initial electrical measurement results with test devices.

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Section: Ag Incorporation Level Determined From Raman and Edssupporting

confidence: 67%

Structural study of Ag-Ge-S solid electrolyte glass system for resistive radiation sensing

Chen

Ailavajhala

Mitkova

et al. 2011

2011 IEEE Workshop on Microelectronics and Electron Devices

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“…That means that KKR is not correlated to any particular band shape, which guarantees the practicability of this relation to spectra independent of the frequency range and the materials' properties. Therefore, KKR is a generally accepted method for the determination of optical constants of solids including amorphous materials (Gaskell & Johnson 1976;Kamitsos et al 1995;Hudgens & Martin 1996;Aasland et al 1997).…”

Section: Derivation and Characteristics Of The Optical Constantsmentioning

confidence: 99%

Steps toward interstellar silicate mineralogy

Jäger¹,

Dorschner²,

Mutschke³

et al. 2003

A&A

282

292

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Abstract. Amorphous silicate particles are generally assumed to be the main dust component in the envelopes of oxygen-rich evolved stars and may be considered the precursors of the pure crystalline enstatite and forsterite particles detected by ISO. We present optical constants in the broad wavelength range 0.2-500 µm for a unique series of pure amorphous Mg-silicates (Mg/Si in the range 0.7-2.4). They have been prepared by the sol-gel process, a chemical technique based on the condensation of Mg-and Si-hydroxides in a liquid phase. The salient feature of these Mg-silicates is the very small content of Si-OH bonds in the silicate network, which considerably reduces the activation energy of crystallization and, thus, decreases the temperature threshold for crystallization as well as crystallization time. The astrophysical relevance of our sol-gel silicates is shown by a comparison of optically thin model spectra based on dust emissivities with ISO-SWS spectra of AGB stars and with 10 µm emission profiles of such stars obtained by ground-based spectroscopy. As paradigmatic cases of AGB spectra with respect to the appearance of the silicate bands, TY Dra (slender bands and deep trough between them) and R Cas (broad bands and widely filled-up trough) were used, for which ISO-SWS spectra are available. The dust emissivity derived from TY Dra can be excellently reproduced by the models, suggesting that the dust grains consist indeed of pure amorphous Mg-silicates. Satisfactory agreement was also found with the mean 10 µm profiles of some groups of AGB stars and supergiants. Spectra with strong dust emission in the silicate trough like R Cas require additional contributions by other dust components, probably oxides. A rough orientation on the spectral properties of such potential trough opacity contributors has been obtained by subtracting a pure silicate spectrum (TY Dra) from a spectrum with a nearly filled trough and a less pronounced 20 µm band (R Cas). In agreement with other amorphous silicates, the spectral index of the new silicate analogues amounts to −2.

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“…We have found from careful analysis of the literature, however, that when glasses are prepared using pure Ag 2 O itself, rather than AgNO 3 as the starting material for Ag 2 O, the IR spectra [20][21][22] reveal a dependence of the BO 4 Ϫ /BO 3 ratio on AgI content. Figure 5 displays the AgI compositional dependence of the ratio of the fractional area under the BO 4 Ϫ peak ͑A 4 ͒ and the fractional area under the BO 3 peak ͑A 3 ͒ as calculated from the mid-IR spectra in this study, where the glasses were prepared from AgNO 3 , and the same fraction as calculated from the mid-IR spectra of Kamitsos et al 20 and Minami et al 21,22 where the glasses were prepared from pure Ag 2 O. Kamitsos et al 23 have shown that the areas A 4 and A 3 of the absorption peaks arising from the BO 4 Ϫ and BO 3 structural groups, respectively, are directly proportional to the numbers of those structural units present in the glassy matrix. In the low AgI content glasses prepared from Ag 2 O, the A 4 /A 3 ratios are substantially lower than those of glasses prepared from AgNO 3 starting material.…”

Section: Mid-ir Spectramentioning

confidence: 99%

“…Kamitsos et al have reported the far-IR spectra of the undoped silver diborate 20 and alkali diborate glasses. 23 They found the far-IR absorbance envelope for the silver diborate glass was best deconvoluted using two Gaussian components.…”

Section: Far-ir Spectramentioning

confidence: 99%

Mid-IR and far-IR investigation of AgI-doped silver diborate glasses

Hudgens

Martin

1996

Phys. Rev. B

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The structures of xAgI+(1−x)Ag2O⋅2B2O3 glasses, where 0.2<~x<~0.6, have been investigated using midand far-infrared spectroscopy. The mid-IR spectra revealed that in those glasses prepared using AgNO3 as the starting material for Ag2O, the BO−4/BO3 ratio is constant with increasing amounts of AgI as would be expected form the proposed behavior of AgI in these glasses. However, a survey of the literature revealed those glasses prepared from pure Ag2O show a strong linear dependence of the BO−4/BO3 ratio on AgI content. Most probably, in those glasses prepared with Ag2O the Ag2O/B2O3 ratio changes with AgI content due to the decomposition of Ag2O during melting. This different behavior is associated with AgNO3 decomposing to Ag2O with heating followed by incorporation into the glassy network. For Ag2O used directly, it is proposed that it decomposes to Ag metal and O2(gas) with heating before it can be incorporated into the borate network. This latter behavior decreases with increasing AgI in the batch composition because AgI lowers the liquidus temperature of the melt considerably. The far-IR analysis of the AgI-doped silver diborate glasses suggests that there are three coordination environments for the Ag+ ions; one with iodide anions and the other two with oxygen ions. It is proposed that the separate oxygen coordination environments for the Ag+ ions arise from one with bridging oxygens of BO−4 units, and the other with nonbridging oxygens on BO−3 units. Furthermore, it is proposed that the Ag+ ions in the iodide-ion environments progressively agglomerate into disordered regions of AgI, but do not form structures similar to α-AgI. These results appear to support the conduction pathway or "microdomain" model for ionic conduction in xAgI+(1−x)Ag2O⋅2B2O3 glasses where the pathways are built up form disordered structures of AgI. Disciplines Ceramic Materials | Materials Science and Engineering CommentsThis article is from Physical Review B 53 (1996) The structures of xAgIϩ͑1Ϫx͒Ag 2 O•2B 2 O 3 glasses, where 0.2рxр0.6, have been investigated using midand far-infrared spectroscopy. The mid-IR spectra revealed that in those glasses prepared using AgNO 3 as the starting material for Ag 2 O, the BO 4 Ϫ /BO 3 ratio is constant with increasing amounts of AgI as would be expected form the proposed behavior of AgI in these glasses. However, a survey of the literature revealed those glasses prepared from pure Ag 2 O show a strong linear dependence of the BO 4 Ϫ /BO 3 ratio on AgI content. Most probably, in those glasses prepared with Ag 2 O the Ag 2 O/B 2 O 3 ratio changes with AgI content due to the decomposition of Ag 2 O during melting. This different behavior is associated with AgNO 3 decomposing to Ag 2 O with heating followed by incorporation into the glassy network. For Ag 2 O used directly, it is proposed that it decomposes to Ag metal and O 2 ͑gas͒ with heating before it can be incorporated into the borate network. This latter behavior decreases with increasing AgI in the batch composition because AgI lower...

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Structure and Optical Conductivity of Silver Thiogermanate Glasses

Cited by 55 publications

References 0 publications

Structural study of Ag-Ge-S solid electrolyte glass system for resistive radiation sensing

Structural study of Ag-Ge-S solid electrolyte glass system for resistive radiation sensing

Steps toward interstellar silicate mineralogy

Mid-IR and far-IR investigation of AgI-doped silver diborate glasses

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