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

Hudgens, James J.; Martin, Steve W.

doi:10.1103/physrevb.53.5348

Cited by 13 publications

(13 citation statements)

References 22 publications

(30 reference statements)

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“…It is interesting to note that, although the IR results obtained from the analysis of reflectance spectra of bulk glasses 46,47 demonstrate that the effect of AgI on the SRO is similar to that reported by Minami et al, 14,15 an IR transmission study of the corresponding glass compositions in thin film forms indicates that the short-range structure remains unaffected by AgI. 48 Such variations in the IR results were attributed 48 to the different preparation methods used in different studies, since the source of the silver oxide modifier can be either pure Ag 2 O ͑Refs. 14, 15, 46, and 47͒ or AgNO 3 .…”

Section: Introductionsupporting

confidence: 53%

“…14, 15, 46, and 47͒ or AgNO 3 . 48 Heat capacity measurements of AgI-borate glasses with nϷ1 and xϷ0.5 revealed the presence of a ␤ transition in the liquid-nitrogen temperature region. This transition was attributed to the freezing-in of the rearrangement of silver ions in amorphous AgI aggregates.…”

Section: Introductionmentioning

confidence: 97%

“…The model of dispersed AgI in borate glasses is supported also by results of 109 Ag NMR, 38 extended x-ray absorption fine structure ͑EXAFS͒, 43 and x-ray diffraction 44 investigations. Contrary to this picture, Raman 32,45 and infrared [46][47][48] spectroscopic investigations provide evidence for the development of disordered AgI microdomains upon increasing the silver iodide content. It is interesting to note that, although the IR results obtained from the analysis of reflectance spectra of bulk glasses 46,47 demonstrate that the effect of AgI on the SRO is similar to that reported by Minami et al, 14,15 an IR transmission study of the corresponding glass compositions in thin film forms indicates that the short-range structure remains unaffected by AgI.…”

Section: Introductionmentioning

confidence: 99%

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Structure of fast-ion-conducting AgI-doped borate glasses in bulk and thin film forms

1999

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The reflectance spectra of bulk superionic glasses xAgI-(1Ϫx)͓Ag 2 O-nB 2 O 3 ͔ with nϭ2, 0рxр0.65 ͑diborate͒ and nϭ0.5, 0.40рxр0.60 ͑pyroborate͒ have been measured in the infrared to investigate the structure of the boron-oxygen network and the nature of sites hosting silver ions. The analysis of the midinfrared spectra showed that the diborate network consists of borate triangles BØ 3 and BØ 2 O Ϫ , and borate tetrahedra BØ 4 Ϫ ͑Øϭoxygen atom bridging two boron centers͒. Similarly, it was shown that pyroborate dimers B 2 O 5 4Ϫ , orthoborate monomers BO 3 3Ϫ , and borate tetrahedra constitute the short-range order of pyroborate glasses. The relative abundance of these borate units was found to be affected by AgI doping in a way that can be described by the isomerization reaction BØ 2 O Ϫ BØ 4Ϫ for nϭ2 and the disproportionation reactionBoth reactions shift to the right upon increasing the amount of AgI. This influence of the doping salt on the glass structure causes the lowering of the glass transition and fictive temperature at which the structure of the supercooled liquid is frozen into the glassy state. A parallel study of infrared transmission spectra of thin films in the diborate family showed the presence of a background interference wave that affects strongly the relative intensity of bands due to borate tetrahedra and triangular units. This finding suggests that conclusions based on direct comparison of infrared spectra of thin film and bulk samples of the same composition should be drawn with caution. The study of the far-infrared profiles of glasses in the pyroborate series suggested that the majority of silver ions exist in two distributions of coordination environments; one is formed primarily by oxygen atoms provided by the borate network and the other is made mainly by iodide ions, without excluding the presence of mixed oxyiodide sites. The spectroscopic characteristics of silver iodide sites were found to change progressively with AgI addition and to point towards sites of tetrahedral coordination such as those found in crystalline AgI. However, for diborate glasses the far-infrared results suggest the presence of oxide, iodide, and mixed O/I environments for silver ions. Therefore, this study shows that the formation and organization of separate silver iodide sites in xAgI-(1Ϫx)͓Ag 2 O-nB 2 O 3 ͔ glasses depends on both Ag 2 O and AgI content. ͓S0163-1829͑99͒02030-5͔

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Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Structure of fast-ion-conducting AgI-doped borate glasses in bulk and thin film forms

1999

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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

283

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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“…The IR spectra have been used to study the structural changes and to gain information concerning the local symmetry of the glassy systems resulting from the interactions between the boron oxide and alkali oxides atoms [11,31]. Fig.…”

Section: Ir Spectramentioning

confidence: 99%

The effect of Alkali Type on the Optical Behavior of Cu Doped Borate Glass Bandpass Filter

2017

Egyptian Journal of Solids

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Borate oxide glass system of composition: 30Y 2 O-43B 2 O 3-7CuO-20ZnO where (Y= Li, Na and K) were prepared using the melt-quenching technique. Some physical properties were studied; such as X-ray diffraction, density, UV-Visible transmission spectra, ESR and FTIR. The density was measured by Archimedes method and the molar volume was calculated. It is found that density and the molar volume show opposite trend. The optical transmission was measured in the spectral range of 200-1100 nm. Some optical properties were determined. The characterized parameters of these filters, i. e. area, center, width, height and full wave at half maximum (FWHM) of band pass, have been estimated. These parameters have been found to be dependent on the alkali type. FTIR spectral studies indicate the presence of triangular and tetrahedral borate structural units. The absorption band observed in the wavelength region 550 nm in these glasses and is the characteristic of Cu 2+ ions. ESR studies suggest that Cu 2+ ions inter into the lattice as copper divalent state.

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

Cited by 13 publications

References 22 publications

Structure of fast-ion-conducting AgI-doped borate glasses in bulk and thin film forms

Structure of fast-ion-conducting AgI-doped borate glasses in bulk and thin film forms

Steps toward interstellar silicate mineralogy

The effect of Alkali Type on the Optical Behavior of Cu Doped Borate Glass Bandpass Filter

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