Vasyl Stadnyk

Position: Chairperson,
General Physics Department, Chief Researcher,
General Physics Department
Scientific degree: Doctor of Physical and Mathematical Sciences
Academic status: Professor
Phone (office): (032) 239-44-29
Google Scholar profile: scholar.google.com.ua

Research interests

  • refractive parameters (indexes of refraction, birefringence, transmission and absorption spectra, piezooptic properties) of mechanically free and uniaxially stressed crystals, posessing a set of phase transitions;
  • crystal optics of ferroics;
  • phase transformations in crystalline dielectrics;
  • Physics of incommensurate phases;
  • low temperature physics.

Professor Vasyl Stadnyk is a scientific supervisor of ten thesis for the Candidate of Physical and Mathematical Sciences:

  1. Tuzyak M. R. “Optic-spectral characteristics of uniaxially stressed ammonium sulfate crystals” (Lviv, 2009);
  2. Kohut Z. O. “The electron polarizability of uniaxially stressed K2ZnCl4 crystals with the incommensurate phase” (Lviv, 2012);
  3. Kiryk Yu. I. “The refractive parameters of uniaxially stressed doped TGS-group crystals” (Lviv, 2013);
  4. Kashuba O. Z. “Effect of uniaxial pressures on the optoelectronic properties of ABSO4-type crystals” (Lviv, 2015);
  5. Rudysh M. Ya. “Electronic and optical properties of lithium ammonium sulfate crystals under uniaxial stress” (Lviv, 2018);
  6. Shchepanskyi P. A. “Band structure peculiarities and optical characteristics of  the ABSO4-group crystals (where A, B = Li, Na, K, NH4 ) with an isotropic point” (Lviv, 2019);
  7. Matviiv R. B. “The influence of impurities on the optical-electronic parameters of dielectric crystals of sulfates group”;
  8. Kildiyarov R. O. “Optics electronics properties of ABSO4 dielectric crystals with transition metals impurities”;
  9. Horon B. I. Optical and electronic parameters of fluoroberyllate group crystals”;
  10. Orykhivskyi I. V. “Piezo-optics, acousto-optics and exchange of the beams momentum in the low-symmetry crystals”.

Professor Vasyl Stadnyk was a scientific consultant of the thesis for the Doctor of Physical and Mathematical Sciences:

Brezvin R. S. “The influence of isomorphic substitution and external fields on the optoelectronic parameters of the sulfate and chlorozincate groups ferrics” (Lviv, 2020).

Selected publications

Articles:

  1. Andriyevsky B. Electronic band structure and influence of uniaxial stresses on the properties of K2SO4 crystals: ab initio study / B. Andriyevsky, M. Jaskólski, V. Y. Stadnyk  [et al.]  // Computatioanal Materials Science. – 2013. – Vol. 79. – P. 442–447.
  2. Stadnyk V. Y. Piezo-optic properties of K2SO4 crystals / V. Y. Stadnyk, O. Z. Kashuba, R. S. Brezvin [et al.] // Crystallography Reports. – 2014. – Vol. 59, No. 1. – Р. 101–104.
  3. Rudysh М. Ya. Energy band structure of LiNH4SO4 crystals / М. Ya. Rudysh, V. Yo. Stadnyk, R. S. Brezvin, P. А. Shchepanskyi // Physics of the Solid State. – 2015. – Vol. 57, No. 1. – P. 53–58.
  4. Кurlyak V. Yu. Piezo-optical properties of incommensurately modulated Rb2ZnCl4 crystals /  V. Yu. Кurlyak,   V. Y. Stadnyk, O. V. Bovgira, V. B. Stakhura // Optics and Spectroscopy. – 2015. – Vol. 118, № 4. – P. 547–551.
  5. Stadnyk V. Yo. Piezo-optic properties of LiNH4SO4  crystals / V. Yo. Stadnyk, R. S. Brezvin, М. Ya. Rudish  [et al.] // Crystallography Reports. – 2015. – Vol. 60, № 3. – P. 388–392.
  6. Кurlyak V. Yu. Temperature-pressure phase diagram for Rb2ZnCl4 crystals / V. Yu. Кurlyak, V. Yo. Stadnyk, V. Stachura // Journal of Applied Spectroscopy. – 2015. – Vol. 82, № 2. – P. 228–233.
  7. Andriyevsky B. Influence of uniaxial stresses on electronic and optical properties of β-K2SO4 crystal / B.  Andriyevsky, M.  Jaskólski, V. Y.  Stadnyk [et al.] // Materials Science-Poland. – 2015. – Vol. 33,   № 1. – P. 11–17.
  8. Andriyevsky B. Electronic band structure and optical properties of ferroelectric TGS, TGSe and TGFB crystals / B. Andriyevsky, V. Yu. Kurlyak, V. Yo. Stadnyk [et al.] // Materials Chemistry and Physics. – 2015. – Vol. 162.  – P. 787–793.
  9. Kurlyak V. Yu. Birefringence of mechanically stressed Rb2ZnCl4 crystals / V. Yu. Kurlyak, V. Yo. Stadnyk, V. B. Stakhura, Z. O. Kohut // Crystallography Reports. – 2015. – Vol. 60, № 6. – P. 929–934.
  10. Kurlyak V. Yu. Optical properties of D-serine doped TGS crystals for pyroelectric sensors / V. Yu. Kurlyak, V. Yo. Stadnyk, B. V. Andriyevsky [et al.] // Materials Science-Poland. – 2015. – Vol. 33, № 4. – P. 692–698.
  11. Kurlyak V. Yu. The temperature changes of refractive indices and thickness of doped triglycine sulfate crystals / V. Yu. Kurlyak, V. Y. Stadnyk, V. M. Gaba [et al.]  // Journal of Applied Spectroscopy. – 2016. – Vol. 83, № 3. – P. 472–477.
  12. Andriyevsky B. Electronic band structure and related properties of Rb2ZnClcrystals at different hydrostatic pressures / B. Andriyevsky, V. Kurlyak, V. Stadnyk [et al.] // Computational Materials Scince. – 2016. – Vol. 111. – P. 257–262.
  13. Rudysh M. Ya. Ionicity and birefringence of α-LiNH4SO4 crystals: ab initio DFT study, X-ray spectroscopy measurements / M. Ya. Rudysh, M. G. Brik, O. Y. Khyzhun [ V. Yo. Stadnyk and et al.] // Royal Society of Chemistry Advances.– 2017. – Vol. 7. – P. 6889–6901.
  14. Stadnyk V. Y. Rerfactometry of Rb2ZnCl4 crystals under uniaxial pressure / V. Y. Stadnyk, V. B. Stakhura, B. V. Аndrievskii // Оptics and Spectroscopy. – 2017. – Vol. 122, № 6. – P. 995–1001.
  15. Shchepanskyi P. A. Structure and optical anisotropy of K1.75(NH4)0.25SO4 solid solution / P. A. Shchepanskyi, O. S. Kushnir, V. Yo. Stadnyk [et al.] // Ukr. Journ. Phys. Optics. – 2017.– Vol. 18, № 4. – P. 187–196.
  16. Rudysh M. Ya. Ab initio calculations of the electronic structure and specific optical features of β-LiNH4SO4 single crystals / M. Ya. Rudysh, M. G. Brik, V. Yo. Stadnyk [et al.] // Physica B: Physics of Condensed Matter. – 2018. – Vol. 528. – P. 37–46.
  17. Shchepanskyi P. A. The influence of partial isomorphic substitution on electronic and optical parameters of ABSO4 group crystals / P. A. Shchepanskyi,  M. Gaba, V.  Yo. Stadnyk [et al.] // Acta Phys. Pol. A.  – 2018. – Vol. 138, No 4. – P. 819–823.
  18. Rudysh M. Ya. Raman scattering spectra of β-LiNH4SO4 crystals / M. Ya. Rudysh, A. I. Kashuba, V. Yo. Stadnyk [et al.] // Journal of Applied Spectroscopy – 2019. – Vol. 85, No. 6. – P. 1022–1028.
  19. Stadnyk V. Yo. On isotropic points in potassium ammonium sulphate / V. Yo. Stadnyk, P. A. Shchepanskyi, R. S. Brezvin [et al.] // Crystals Crystallography Reports. – 2019. – Vol. 64, No. 5. –  Р. 787–795.
  20. Stadnyk V. Y. Photoelastic properties of potassium sulfate crystals / V. Y. Stadnyk, R. B. Matviiv, P. A. Shchepanskii, M. Ya. Rudysh, and Z. A. Kogut. // Physics of the Solid State. – 2019. – Vol. 61, No. 11. – P. 2130–2133.
  21. Stadnyk V. Yo. Pressure-induced changes in parameters of the indicatrix of lithium sodium sulfate crystals / V. Yo. Stadnyk, Р. A. Shchepanskyi, R. S. Brezvin [et al.] //  Optics and Spectroscopy. – 2019. – Vol. 127. – P. 1023–1027.
  22. Stadnyk V. Yo. Refractive parameters and band energy structure of K2SO4 crystals doped with copper / V. Yo. Stadnyk, R. B. Matviiv, M. Ya. Rudysh [et al.] // Journal of Applied Spectroscopy. – 2020. – Vol. 87. – P. 143–149.
  23. Rudysh M. Ya. Specific features of refractive, piezo-optic and nonlinear optical dispersions of β-LiNH4SO4 single crystals / M. Ya. Rudysh,  V. Yo. Stadnyk, P. A. Shchepanskyi [et al.] // Physica B: Condensed Matter. – 2020 – Vol. 18. – P. 411919.

Pathents:

  1. Пат. 128162 Україна на корисну модель, МПК G01N 21/39 (2006.01). Пристрій для дослідження оптичної якості монокристала / Стадник В. Й., Габа В. М., Сугак Д. Ю., Брезвін Р. С., Рудиш М. Я., Щепанський  П. А. ; заявник Львівський національний університет імені Івана Франка, власники Львівський національний університет  імені Івана Франка, Національний університет “Львівська політехніка”. –  №u201801973 ; заявл. 26.02.2018 ; опубл. 10.09.2018, бюл. № 17.
  2. Пат. 139890 Україна (на корисну модель), МПК:G01L 1/24 (2006.01). Пристрій для вимірювання одновісного механічного тиску / Стадник В. Й., Рудиш М. Я., Щепанський П. А., Матвіїв Р. Б., Габа    В. М., Когут З. О., Брезвін Р. С. ; заявники і власники Львівський національний університет імені Івана Франка, Національний університет “Львівська політехніка”. – № u201907532 ; заявл. 05.07.2019 ; опубл. 27.01.2020, бюл. № 2/2020.
  3. Пат. 140611 Україна (на корисну модель), МПК (2006): G01K 11/00, G01K 11/32 (2006.01). Пристрій для оптичного вимірювання температури / Стадник В. Й., Габа В. М., Рудиш М. Я., Щепанський П. А., Матвіїв Р. Б., Брезвін Р. С., Петрович І. В. ; заявники і власники Львівський національний університет імені Івана Франка, Національний університет “Львівська політехніка”. – № u201907533; заявл. 05.07.2019 ; опубл. 10.03.2020, бюл. № 5/2020.

Scientific biography

In 1985 Vasyl Stadnyk graduated from the Faculty of Physics of Ivan Franko State University of Lviv with honors. He received full higher education on a specialty “Optical and opto-electronic systems” and got a qualification of an engineer-optician-researcher.

From 1985 till 1986 he worked as an engineer at the Research and Development Department of the Ivan Franko State University of Lviv.

From 1986 till 1987 he was an engineer of the Department of Experimental Physics.

From 1987 till 1990 he was a post-graduate student on the Department of Experimental Physics of Ivan Franko State University of Lviv.

In 1990 Vasyl Stadnyk defended his Ph.D. thesis named “Electron polarization of А2ВХ4 group crystals with incommensurate phases“. He had been awarded a candidate degree of sciences in physics and mathematics, specialty – solid state physics.

From 1990 till 1991 he worked as a junior researcher and from 1991 till 1992 as a senior researcher at the Research and Development Department of Ivan Franko State University of Lviv.

From1992 til 1999 Vasyl Stadnyk worked as an assistant, during next 1999–2007 years – a docent of the Department of Experimental Physics of Ivan Franko State University of Lviv (since October 11, 1999, Ivan Franko National University of Lviv).

In 1999 he was awarded the academic status of an associate professor of the Department of Experimental Physics.

In 2006 he defended his thesis for a doctor degree named “Baric changes of the refractive parameters of dielectric crystals“. He was awarded the scientific degree of a doctor of  sciences in physics and mathematics, specialty –  physics of semiconductors and insulators.

From 2007 till 2008 Vasyl Stadnyk worked as a docent, from 2008 till 2016 – a professor of the Department of Solid State Physics of Ivan Franko National University of Lviv.

In 2011 he was awarded the the academic status of a professor of the Department of Solid State Physics.

Since May 2016 he is a chairperson of the Department of General Physics of the Ivan Franko National University of Lviv.

He was a scientific co-supervisor the economic contractual theme named “Synthesis of a new class of crystalline materials of А2ВХ4 group and study of the prospects of their effective application in electromagnetic radiation controlling devices” in 2017 and 2018 years.

Vasyl Stadnyk was a scientific supervisor of the State budget theme Fz-53F named “New materials for functional electronics on the basis of semiconductor and dielectric crystals of А4ВХ6 and А2ВХ4 groups” (2017-2019 years).

Currently he is a scientific supervisor of the State budget theme Fz-08F named “Transformation of the optic-electronic parameters and structure of new crystalline materials for sensor devices and optoelectronics” (2020-2022 years).

He is an author of 326 scientific publications and 5 utility models of Ukraine.

Vasyl Stadnyk is a supervisor of 10 thesis (6 thesis of them were defended). Currently he supervises the research work of 4 Postgraduate Students of the Department of General Physics. Professor Vasyl Stadnyk was a scientific consultant of the thesis for the Doctor of Physical and Mathematical Sciences.

Teaching and methodological work of Vasyl Stadnyk includes 3 monographs, 4 tutorials and 3 methodical materials.

Projects

Professor Vasyl Stadnyk is a scientific supervisor of the State budget theme Fz-08F. 

The State budget theme Fz-08F named Transformation of the optic-electronic parameters and structure of new crystalline materials for sensor devices and optoelectronics” (01.05.2020 – 31.12.2022):

Aim of the work: Elucidation of optic-electronic and band-energy parameters of ferroics of ABSO4 (including substitutional solid solutions and crystals incorporated by transition metal impurities) and A4BX6 structural types and the influence of external fields on them for possible use of the crystals as active elements of functional electronics devices.

The LiNH4SO4 dielectric single crystal of β-polymorphic modification was synthesized by the method of slow evaporation of the aqueous solution at constant temperature of 308 K. In order to identify the grown crystals the X-ray diraction studies were performed. The crystal was confirmed to belong to the β-modication with orthorhombic symmetry of Pna21 space group symmetry. At temperatures above 461 K the birefringence curves for all three directions slightly change the course. In order to confirm the presence of the phase transition in the β-LiNH4SO4 crystal during heating, we performed the differential thermal analysis.

During the reporting year 5 articles (including 3 articles in Scopus) and 6 abstracts of reports were published, and the thesis for a Doctor degree and the thesis for a Candidate degree were defended.

Teaching materials

Monographs:

  1. Стадник В. Й. Рефрактометрія кристалів з несумірними фазами : монографія / В. Й. Стадник, В. М. Габа. – Львів : Ліга-Прес, 2010. – 352 с.
  2. Стадник В. Й. Електронна поляризовність фероїків : монографія / В. Й. Стадник, М. О. Романюк,     Р. С. Брезвін. – Львів : ЛНУ імені Івана Франка, 2013. – 306 с.
  3. Брезвін Р. С. Оптико-електронні параметри кристалів групи сульфатів та цинкатів : монографія / Р. С. Брезвін, В. М. Габа, М. О. Романюк, В. Й. Стадник. – Львів : Ліга-Прес, 2018. – 244 с.

Tutorials:

  1. Стадник В. Й. Оптика, елементи атомної та ядерної фізики : навч. посібник [для студ. вищ. навч. закл. (гриф МОН України)] / В. Й. Стадник. – Львів : ВЦ ЛНУ імені Івана Франка, 2008. – 360 с.
  2. Франів А. Фізика низьких температур : навч. посібник / А. Франів, В. Стадник, В. Курляк. – Львів : ЛНУ імені Івана Франка, 2018. – 362 с.
  3. Антоняк О. Т. Загальна фізика : підґрунтя оптики : навч. посіб. / О. Т. Антоняк, В. Й. Стадник. – Львів : ЛНУ імені Івана Франка, 2019. – 216 с.
  4. Стадник В. Й. Фізика діелектриків : навч. посібник [для студ. вищ. навч. закл. (гриф МОН України)] /   В. Й. Стадник, В. Б. Капустяник. – Львів (у видавництві).

Methodical materials:

  1. Стадник В. Й. Методичні вказівки до лабораторних робіт зі спецкурсу “Кристалооптика і кристалофізика” для студентів фізичного факультету (Ч. ІІІ) / В. Й. Стадник, М. О. Романюк, Б. В. Андрієвський, В. Ю. Курляк. – Львів, 1988. – 36 с.
  2. Стадник В. Й. Методичні рекомендації до виконання лабораторних робіт зі спецкурсу “Лазерна метрологія” для студентів фізичного факультету / В. Й. Стадник, М. О. Романюк, Б. В. Андрієвський, В. Ю. Курляк. – Львів, 2001. – 48 с.
  3. Стадник В. Й. Методичні вказівки до лабораторних робіт зі спецкурсу “Кристалооптика і кристалофізика” для студентів фізичного факультет (Ч. ІV)./ В. Й. Стадник, В. Ю. Курляк, М. О. Романюк, Б. В. Андрієвський, Л. Т. Карплюк. – Львів, 2003. – 72 с.

Schedule

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