Title: Специализация: 510403 Физика конденсированного состояния
Author: Pepper
Last saved by: Shevchenko
Company: Home

Specialization: 010700/03 Physics of condensed matter 
Program: 41 Coherent phonons and NMR in solids 
Head of the program: Professor E.V. Charnaya 
Solid State Physics department
Scientific adviser: candidate of physical and mathematical sciences B.F. Borisov
Reviewer: candidate of physical and mathematical sciences A.A. Abramovich

Acoustic researches of phase transition in decan and silver iodide embedded in nanopore of silicate matrices

Evgenii V. Shevchenko

In this paper, were made researches of «melt-crystallization» phase transition in decan embedded in nanopores of opal by acoustic method. Diameter of the particles in the matrix is a 25 nm. The relative change of ultrasound velocity in the system «opal+decan» as a function of the temperature showed that: melting point lower than in bulk dean; presence of temperature hysteresis; blurring of the process temperature.
For the first time, acoustic studies were done in a superionic conductor – AgI (silver iodide) bounded geometry. The silver iodide had embedded into MCM- 41 silicate matrix. Diameter of the pores in the matrix MCM- 41 is a 37 Å. The ultrasound velocity jump in the system «AgI+MCM-41» as a function of the temperature was around 25% in the region of α-β structural phase transition.