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Nikolay Ovsyuk

Group of physical properties of minerals (lab. 436)

Institute of Geology and Mineralogy

Siberian Branch of Russian Academy of Sciences

Grants and reports
This page gives summary information about grant funding I have obtained for my research. These works was supported by the Russian Foundation for Basic Research.

Study of initial stages of nucleation in minerals by low-frequency Raman and Fourier transform spectroscopies
(00-05-65429; 2000-2002)
Brief report
Study of pressure-induced amorphization of minerals by low-frequency Raman and Fourier transform spectroscopies
(01-05-65373; 2001-2003)
Brief report

We have investigated the influence of
structural disorder in the amorphous solids, which came before the nucleation, on the intensity of light scattering by the acoustic phonons. For the construction of non-fluctu-ational theory we need the data on the structural disorder in the nuclei until they reach the critical radius. It turned out that not only the processes of nucleation, but the phase transitions which are caused by these processes are also poorly studied. (In more detail...)

We have investigated the proper mono -
clinic-triclinic ferroelastic phase transition (FPT) in Sr - anorthite (Sr,Ca)Al2Si2O8 which may be viewed as an intermediate stage of amorphization. We have tried to clarify the most general reason for elastic instability of the crystals. (In more detail...)


Investigation of new models pressure-induced amorphization for two distinct topological classes of minerals
(04-05-64550; 2004-2006)
Brief report
Investigation of phonon quantization and electron-phonon interaction in semiconductor nanoparticles by the Raman scattering and photoluminescence
(08-02-91325; 2008-2009)
Brief report

For verification of the new amorphization
model [M.H. Cohen et al., Journal of Non-Cryst. Solids 307, 602 (2002)] which is considered in our work, it is necessary to know, whether amorphization results in a change of topology of minerals or it remains the same. (In more detail...)

The project aimed at the development of
nanophononics, a new field of nanoscale science, which deals with the properties of phonons in nanostructures and control of phonon dispersion in nanostructures, hence, with phonon engineering. (In more detail...)


Amorphous-amorphous phase transitions in multicomponent minerals at high pressures
(08-05-01025; 2008-2010)
Brief report
Size-dependent the amorphous-amorphous phase transitions in tetrahedrally and octahedrally coordinated nanoparticles
(11-02-92716; 2011-2012)
Brief report

It was carried out the experimental and
theoretical research of dynamic and static mechanisms of the amorphization in order to receive the general physical picture of microscopic processes underlying of the amorphization in a number of the frame minerals at applying of external pressure. (In more detail...)

The project is aimed at the investigation of
pressure-induced polyamorphism, which is an unusual and intriguing phenomenon and many works have been devoted to understanding the underlying mechanisms. It consists in a first-order transition between a low-density amorphous state (LDA) and a high-density amorphous state (HDA) through pressure application with significant changes in structure and physical properties of the amorphous solids. (In more detail...)


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Group of physical properties of minerals (lab. 436)
Institute of Geology and Mineralogy
Koptyug Pr. 3 • Novosibirsk 630090 • RUSSIA
tel 011-7-383-330-4427 • fax 011-7-383-333-2792 ovsyuk@igm.nsc.ru