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Optical Characteristics of porous glasses Matrix and Its Light-conducted Mechanism

Journal of Wuhan University of Technology(Materials Science) 2004年第4期19卷 34-36页

作者：郭丽萍 Wuhan University of Technology

The optical properties of matrix of porous glasses and phase-separated glasses were investigated by visible spectroscopy and infrared spectroscopy. The experimental results show that, both the porous glasses and phase-separated glasses have very good light transmission in visible light region that wavelenth is longer than 560nm. The micropores of porous glasses and the boron-rich phase of phase-separated glasses have strong Rayleigh scatter effects on the visible light, the largest scatter occurrs at 360-370nm; the thicker the glasses, the larger the light scattering. Thus, the pore size distribution and the size of heterogeneous micro zone in boron-rich phase of phase-separated glasses can be measured. After coupled into porours glasses, the most intense absorption of hydrated ions of 〔Co(H 2O) 6〕 2+ shifts from 508nm to 515nm. The production of the most intense absorption and the red shift were owed to Jahn-Teller effect of octahedral field formed by six H 2O molecular and perturbation effect resulted by microporous of porous glasses for its physics-chemical circumstance. As a result, the porous glasses are perfect optical function materials in visible region, which can be assembled by chemical method.

关键词： porous glasses phase separation photoelectric materials matrix

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Effect of interface carbonization on dielectric properties of potassium nitrate nanocomposite based on porous glasses

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Journal of Advanced Dielectrics 2022年第4期12卷 42-48页

作者： A.Molokov A.Sysoeva A.Naberezhnov R.Kumar E.Koroleva S.Vakhrushev Peter the Great St.-Petersburg Polytechnical University Polytechnicheskaya 29195251 St.-PetersburgRussia Ioffe Institute Polytekhnicheskaya 26194021 St.-PetersburgRussia Laboratory for High Performance Ceramics Department of Metallurgical and Materials Engineering Indian Institute of Technology-Madras(IIT Madras)Chennai 600036India

Dielectric properties and structure of pure and carbon-modified nanocomposites on the base of porous glasses with an average pore diameter of 6 nm(PG6)with embedded KNO3 have been studied at the temperature diapason of 300-430 K and at fre-quencies of 0.1-3×10^(6) Hz on cooling.X-ray diffraction studies of these samples have shown,that in modified and unmodified composites there is a mixture of the low-temperature paraelectric phase(α-phase)and the ferroelectricγ-*** modified composites,a decrease in permittivity and conductivity is *** response has been analyzed in the framework of modern theoretical *** relaxation processes have been identified and their origin has been *** has been found that the main contribution to the dielectric response of nanocomposite material PG6+KNO3 is provided by charge polarization on interfaces,which can be governed by modifying the inner pore ***-conductivity of both composites has been estimated and the activation energies have been *** energy change observed in a vicinity of 360 K is attributed to the phase transformation and the appearance of KNO3α-phase.

关键词： Nanocomposites ferroelectrics potassium nitrate porous glasses dielectric properties

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