- Oleksandr Tkach (born 1976) is Auxiliary Researcher of Materials and Ceramic Engineering Department at the University of Aveiro, CICECO – Aveiro Institute of Materials, the largest Materials Science Institute in Portugal. Oleksandr is a member of the European Ceramic Society and Editorial board member of International Journal of Materials Science and Applications, Science Publishing Group.
- Oleksandr Tkach graduated in Microelectronics and Semiconductor Devices by the National Technical University of Ukraine “Kyiv Polytechnic Institute” in June 1999, investigating nanocrystalline silicon for optoelectronic applications. In September 2005 he got his Ph.D. in Materials Science and Engineering from the University of Aveiro, Portugal, working on strontium titanate based ceramics for tunable device applications. This was followed by a 1.5 year post-doctoral fellow in the same group, including participation in European Network of Excellence FAME (2006-2008) and EU FP6 STREP project MULTICERAL (multiferroics preparation). Since June 2007 Dr. Tkach has been post-doctoral fellow by Portuguese Foundation for Science and Technology (FCT) in University of Porto, Portugal, working on alkali tantalates and other perovskite ceramics and thin films, participating as well in a bilateral Portugal / Germany - GRICES / DAAD project (2008) and 2 FCT projects (2008-2012). In December 2012, he got post-doc contract at the Johannes Gutenberg University of Mainz, Germany, within EU FP7 project IFOX, investigating artificial multiferroic heterostructures and contributing to the photoemission-electron-microscopy synchrotron beam-times. In February 2014 he was promoted to Auxiliary Researcher position at the University of Aveiro, CICECO, coordinating FCT Independent Researcher Starting Grant “Multifunctional all-oxide nanostructures for electronic applications” and participating in European Cooperation in Science and Technology COST action MP1308 TO-BE - Toward oxide based electronics (2014-2018). He is a member of the European Ceramic Society since January 2017. In January 2018 he was offered an Editorial board membership in International Journal of Materials Science and Applications, Science Publishing Group.
- Oleksandr (Alexander) Tkach has publication profile containing 1 edited book, 5 book chapters and 75 papers published or accepted for publication in SCI journals and proceedings, including Nature Physics, Advanced Functional Materials, Chemistry of Materials, Physical Review Letters and Carbon, with over 1,100 citations (h-index 21), according to Scopus (Author ID: 7006368460) and Web of Science (search parameters Author: Tkach A and Address: Aveiro or Mainz). According to Google Scholar (profile Alexander Tkach), there are over 1350 citations with h-index of 23. From 31 publications by Dr. Tkach in the top quartile JCR SCI journals in their areas, 6 papers are published in the highest IF journal of specific area Materials Science - Ceramics (Journal of the European Ceramics Society) and 5 in the area Metallurgy and Metallurgical Engineering (Acta Materialia), while 1 more publication was done in the second highest IF journal of the area Multidisciplinary Physics (Nature Physics). The main field of the published research is related to strontium titanate-based materials (50 papers, 4 chapters and PhD thesis), alkali tantalates and niobates (11 papers and 1 book chapter), magnetoelectric heterostructures (10 papers) and graphene oxide derived materials (4 papers). He has coordinated 2 post-docs and (co-)supervised 4 Master students. He has accepted 4 offers to give invited talks at international conferences and was an organizing committee member of 3 scientific meetings, crowned by VIII International Symposium on Materials “MATERIAIS 2017” with ~400 participants. He has been a referee for 23 leading journals in Materials Science, Physics and Chemistry, from Ferroelectrics to Advanced Materials.
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Low-temperature dielectric response of NaTaO3 ceramics and filmsTkach, A; Almeida, A; Moreira, JA; de la Cruz, JP; Romaguera-Barcelay, Y; Vilarinho, PM 2012, APPLIED PHYSICS LETTERS, 100, 19,
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Magnetic Anomaly and Dielectric Tunability of (Sr,Mn)TiO3 Thin FilmsTkach, A; Okhay, O; Wu, AY; Vilarinho, PM; Bedanta, S; Shvartsman, VV; Borisov, P 2012, FERROELECTRICS, 426, 274-281.
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Microscopy and the Solid Solubility Limit in K1-xMnxTaO3 CeramicsTkach, A; Vilarinho, PM; Almeida, A 2012, MICROSCOPY AND MICROANALYSIS, 18, 89-90.
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Dielectric relaxation of Sr1-1.5xBixTiO3 sol-gel thin filmsOkhay, O; Wu, AY; Vilarinho, PM; Tkach, A 2011, JOURNAL OF APPLIED PHYSICS, 109, 6,
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Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3Tkach, A; Almeida, A; Moreira, JA; Correia, TM; Chaves, MR; Okhay, O; Vilarinho, PM; Gregora, I; Petzelt, J 2011, APPLIED PHYSICS LETTERS, 98, 5,
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Lithium-induced dielectric relaxations in potassium tantalate ceramicsTkach, A; Almeida, A; Moreira, JA; Espinha, A; Chaves, MR; de la Cruz, JP; Vilarinho, PM 2011, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 44, 31,
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Role of trivalent Sr substituents and Sr vacancies in tetragonal and polar states of SrTiO3Tkach, A; Correia, TM; Almeida, A; Moreira, JA; Chaves, MR; Okhay, O; Vilarinho, PM; Gregora, I; Petzelt, J 2011, ACTA MATERIALIA, 59, 14, 5388-5397.
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Role of initial potassium excess on the properties of potassium tantalate ceramicsTkach, A; Vilarinho, PM; Almeida, A 2011, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 31, 13, 2303-2308.
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Mechanisms of magnetoelectricity in manganese-doped incipient ferroelectricsKuzian, RO; Laguta, VV; Dare, AM; Kondakova, IV; Marysko, M; Raymond, L; Garmash, EP; Pavlikov, VN; Tkach, A; Vilarinho, PM; Hayn, R 2010, EPL, 92, 1,
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X-ray absorption fine structure studies of Mn coordination in doped perovskite SrTiO3Levin, I; Krayzman, V; Woicik, JC; Tkach, A; Vilarinho, PM 2010, APPLIED PHYSICS LETTERS, 96, 5,
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Low temperature dielectric characterization of Mg-doped SrTiO3 thin films prepared by sol-gelOkhay, O; Wu, AY; Vilarinho, PM; Tkach, A 2010, APPLIED PHYSICS LETTERS, 96, 15,
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Dielectric response of polycrystalline Sr1-1.5xBixTiO3 thin films under direct current biasOkhay, O; Wu, AY; Vilarinho, PM; Tkach, A 2010, APPLIED PHYSICS LETTERS, 97, 6,
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Lattice dynamics in Ba0.7Sr0.3TiO3: study by THz and IR spectroscopy and ab initio simulationsOstapchuk, T; Petzelt, J; Kuzel, P; Savinov, M; Hlinka, J; Tkach, A; Vilarinho, PM; Lisenkov, S; Ponomareva, I; Bellaiche, L 2010, PHASE TRANSITIONS, 83, 10-11, 955-965.
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Spin cluster glass and magnetoelectricity in Mn-doped KTaO3.Shvartsman, VV; Bedanta, S; Borisov, P; Kleemann, W; Tkach, A; Vilarinho, PM 2010, JOURNAL OF APPLIED PHYSICS, 107, 10,
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Sr- and Ti-site substitution, lattice dynamics, and octahedral tilt transition relationship in SrTiO3:Mn ceramicsTkach, A; Vilarinho, PM; Nuzhnyy, D; Petzelt, J 2010, ACTA MATERIALIA, 58, 2, 577-582.
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