Partner: Hregory Savytskyy

Ya.S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU (UA)

Recent publications
1.Sugak D., Syvorotka I., Yakhnevych U., Buryy O., Levintant-Zayonts N., Savytskyy H., Bonchyk O., Ubizskii S., Comparative Investigations of Nanohardness and Impurity Distribution Profiles of Lithium Niobate Single Crystals Diffusion Doped by Copper Ions, Crystal Research and Technology, ISSN: 1521-4079, DOI: 10.1002/crat.201900117, pp.1900117-1-7, 2019
Abstract:

Spatial changes of optical and mechanical properties of doped lithium niobate (LN, LiNbO3) single crystals are investigated. The crystals are doped with copper ions by thermal diffusion at elevated temperatures. LiNbO3 crystal absorption spectra are recorded in a direction perpendicular to the direction of diffusion. The concentrations of copper ions are calculated using the Smakula–Dexter formula. To determine a relation between changes of optical and mechanical properties, the hardness profiles of the doped crystals are investigated by the nanoindentation technique. Young’s modulus and hardness are specified in accordance with the Oliver–Pharr method.

Affiliations:
Sugak D.-other affiliation
Syvorotka I.-Scientific Research Company Carat Ukraina (UA)
Yakhnevych U.-Lviv Polytechnic National University (UA)
Buryy O.-Lviv Polytechnic National University (UA)
Levintant-Zayonts N.-IPPT PAN
Savytskyy H.-Ya.S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU (UA)
Bonchyk O.-Ya.S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU (UA)
Ubizskii S.-Lviv Polytechnic National University (UA)
2.Misztal-Faraj B., Sajkiewicz P., Savytskyy H., Bonchyk O., Gradys A., Ziabicki A., Following phase transitions by depolarizing light intensity. The experimental setup, POLYMER TESTING, ISSN: 0142-9418, DOI: 10.1016/j.polymertesting.2008.09.012, Vol.28, pp.36-41, 2009
Abstract:

A new setup for light depolarization measurements was designed. Two innovative elements have been introduced. The first is an electronic system which enables depolarization ratio to be registered directly. The second is a system of temperature control allowing effective implementation of a temperature–time program according to the particular requirements. Direct registration of depolarization ratio instead of intensity of depolarized light for individual components (parallel and perpendicular), as is performed in the usual apparatus, allows elimination of light scattering effects because of the insensitivity of depolarization ratio to the scattering level. Application of the new setup was shown for crystallization and melting of isotactic polypropylene (i-PP). Comparison of phase transitions in i-PP, as registered by light depolarization and DSC, indicates some differences. Possible sources of the observed differences are discussed.

Keywords:

Light depolarization, Polymers, Crystallization, Melting, Kinetics of phase transitions

Affiliations:
Misztal-Faraj B.-IPPT PAN
Sajkiewicz P.-IPPT PAN
Savytskyy H.-Ya.S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU (UA)
Bonchyk O.-Ya.S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU (UA)
Gradys A.-IPPT PAN
Ziabicki A.-IPPT PAN

Conference abstracts
1.Izhnin I., Voitsekhovskii A., Korotaev A., Fitsych O., Bonchyk O., Savytskyy H., Mynbaev K., Varavin V., Dvoretsky S., Mikhailov N., Yakushev M., Jakiela R., Levintant-Zayonts N., Electrical and optical properties of arsenic - implanted Cdx Hg1-x Te MBE films, ION 2016, XI International Conference ION IMPLANTATION AND OTHER APPLICATIONS OF IONS AND ELECTRONS, 2016-06-13/06-16, Kazimierz Dolny (PL), pp.72, 2016