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1
Content available Infrared studies and spectral properties of photochromic high silica glasses
Girsova M A, Golovina G F, Drozdova I.A., Polyakova I G, Antropova T V
Optica Applicata
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2014
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Vol. 44, nr 2
337--344
EN
The structure of photochromic high silica glasses (PHSGs) was studied by UV–VIS–NIR and IR spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. PHSG plates were obtained by impregnation of silica porous glasses at first with AgNO3 aqueous solution (in or without the presence of the sensitizers, such as Cu(NO3)2 or Ce(NO3)3), next in the mixed halide salt (NH4Cl, KBr, KI) solution. Then a part of the samples was sintered at temperatures from 850 to 900 °C up to closing of the pores. The results of TEM study have shown that the PHSG plates have two-phase structure with inclusions of the size of 10–100 nm. According to XRD data, the PHSGs contain the AgBr phase. IR spectra confirmed the presence of AgI, AgCl, CeO2, CuCl2, CuCl phases in PHSGs.
2
Content available remote Effect of structure parameters and composition of high-silica porous glasses on their thermal and radiation resistant properties
Antropova T.V., Volkova A.V., Petrov D.V., Stolyar S.V., Ermakova L.E., Sidorova M.P., Yakovlev E.B., Drozdova I.A.
Optica Applicata
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2005
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Vol. 35, nr 4
717-723
EN
The influence of a composition of initial phase-separated alkali borosilicate glass and its thermal treatment as well leaching conditions on the parameters of the porous glass structure are discussed. The results obtained by adsorption and conductivity methods, transmission electron microscopy and dilatometer technique were used to analyse the effect of structure parameters and composition of high-silica porous glasses on their thermal and radiation resistant properties.
3
Content available remote Application of electron microscopy methods to the study of porous and quartz-like glasses
Drozdova I.A., Antropova T.V., Tolkachev M.D.
Optica Applicata
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2005
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Vol. 35, nr 4
709-715
EN
The structure of high-silica porous glasses and quartz-like (Vycor type) glasses has been investigated by transmission and scanning electron microscopy and by electron micro-probe analysis. Porous glasses (PGs) have been manufactured by acid leaching of phase-separated alkali borosilicate glass plates. To obtain the quartz-like glasses the PG samples were sintered at different temperatures up to 900°C. Before sintering a part of PGs was impregnated with salt solutions containing Ag. Features of the structure of quartz-like glass matrix are revealed. The parameters and arrangement of a photosensitive Ag-Hal phase in photochromic quartz-like glasses are determined.
4
Content available remote Sintering of optical porous glasses
Antropova T. V., Drozdova I. A.
Optica Applicata
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2003
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Vol. 33, nr 1
13-22
EN
The changes in the visible light transmission of the optical porous glasses (PGs), arising from PGs thermal treatment, have been investigated by transmission electron microscopy and optical spectroscopy technique. Also the PGs thermal properties such as linear shrinkage and viscosity have been studied. These PGs are used in optics and laser technology as the base for the micro- optical elements produced by a local laser sintering of PGs.
5
Content available remote Optical properties and structure of porous glasses
Evstrapov A. A., Antropova T. V., Drozdova I. A., Yastrebov S. G.
Optica Applicata
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2003
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Vol. 33, nr 1
45-54
EN
The results of measurements concerning spectral dependences of transmission and reflection coefficients both for porous and two-phase glasses are presented. Relative estimations have been performed for transmission and reflection coefficients of examined samples. Optical characteristics, such as the dispersion of refractive index and absorption coefficient, have been found for porous glasses. Porosity of the material and the sizes of micropores have been determined from the optical characteristics of glasses with the assumption of identity and uniformity of pores.
6
Content available remote Porous glass: inhomogeneities and light transmission.
Antropova T.V., Drozdova I.A., Yastrebov S.G., Evstrapov A.A.
Optica Applicata
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2000
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Vol. 30, nr 4
553-568
EN
Basic optical characteristics were studied to reveal the structure of porous glass samples. Acid leaching technology was used to manufacture porous glasses from the bulk of phase-separated alkali borosilicate glasses. The transmission electron microscopy, selected area diffraction and shadow graph techniques, optical microscopy and spectrophotometry, reflective ellipsometry were used to obtain new information about some inhomogeneities such as strata and spindle-like silica precipitates as well as boron containing microcrystalline phases inside porous glasses.
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