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2 Optica Applicata

2 2012

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Neutron diffraction study of porous glasses structure

100%

Naberezhnov A. , Antropova T. , Glavatsky I. , Seregin M. , Drozdova I.

tom Vol. 42, nr 2

271-280

Microscopic structure of three types of porous glasses with the average pore diameter of 5, 7 and 140 nm obtained by chemical etching was studied by neutron diffraction. The analysis of diffraction patterns has shown that in these glasses, besides an amorphous phase forming a weakly structured background, there are microscopic crystalline inclusions of sassolite with a diffraction size of 26š3 nm and of ?-quartz with a characteristic size of 6š1 nm. Microcrystalline inclusions sizes do not depend on the average pore size diameter. It is shown that in these samples a tridymite phase does not make a significant contribution to observed scattering and a relative sassolite contribution decreases substantially with the average pore size increasing from 5 to 140 nm.

Dielectric properties of two-phase and porous ferriferous glasses

86%

Koroleva E. , Burdin D. , Antropova T. , Porechnaya N. , Naberezhnov A. , Anfimova I. , Pschenko O.

tom Vol. 42, nr 2

287-294

In the present contribution we have studied the dielectric properties of two-phase sodium borosilicate glasses doped by iron oxide and of porous media based on them. The temperature dependences of dielectric permittivity and conductivity for all samples have been obtained, and the impedance spectroscopy analysis for porous magnetic glasses has been done. The obtained data allow us to estimate the values of activation energies for porous samples.