Title: ПРАВИЛА ОФОРМЛЕНИЯ ТЕЗИСОВ КОНФЕРЕНЦИИ ВНКСФ-7
Author: Sergey Trapeznikov
Last saved by: Andrey
Company: Saint-Petersburg State University

Specialization: 010700/03  Physics of condensed state of matter
Program: 41  Coherent phonons and NMR in solids
Head of the program: prof. E.V. Charnaya
Department of Solid State Physics
Scientific adviser: dr. B.F. Borisov
Reviewer: dr. A. A. Abramovich

Acoustical properties of nanocomposites on the basis of porous matrices
A.V. Uskov

Dependence of ultrasonic sound speed on temperature contains information which could be used in order to determine the temperature of phase transition in the substance embedded to porous matrix.
The measurements of longitudinal sound speed were carried out at frequencies from 4 to 7 MHz. Artificial opals, macroporous and microporous glasses were filled with eutectic Ga(96%)-In(4%) alloy.
It was shown that:
1. Instantaneous crystallization could be observed in artificial opals. No similar effects could be observed in porous glasses
2. The higher pore size is the higher the melting temperature is.
3. The hysteresis loop in microporous glass is wider than in the hysteresis loop in macroporous glass.
In order to interpret the results obtained the theoretical model predicting dependence of sound speed on sintering factor in artificial opal was built. 

The list of the publications
1. A.V.Uskov. Calculation of sound speed in artificial opal// Conference abstracts International Student Conference “Science and Progress”, St. Petersburg – Peterhof, 2011. p.124.
2. Б.Ф. Борисов, П.В.Великоруссов, А.В.Усков, Е.В.Чарная. Акустические свойства композитов на основе пористых силикатных матриц// Сборник трудов XXV Сессии РАО (в печати)