Oleksandr Tkach. É da Universidade do Porto. Publicou 38 artigos em revistas especializadas. Recebeu 1 prémio e/ou homenagem. Actua na área de Engenharia dos Materiais Nas suas actividades profissionais interagiu com 58 colaboradores em co-autorias de trabalhos científicos.
Endereço de acesso a este CV: http://www.degois.pt/visualizador/curriculum.jsp?key=9222897171941149

Nome completo Full name	Oleksandr Tkach
Nome em citações bibliográficas Quoting name	A. Tkach
Domínio científico de atuação Scientific domain	Engenharia e Tecnologia-Engenharia dos Materiais. Ciências Exactas-Física.

Endereço profissional Professional address

Universidade do Porto Faculdade de Ciências Departamento de Física e Astronomia Rua do Campo Alegre, 687 Porto 4169-007 Porto Portugal Correio electrónico: atkach@fc.up.pt

Sexo Gender

Masculino»Male

2000-2005	Doutoramento Phd
Material Science and Engineering (5 anos » years) . Universidade de Aveiro, Portugal.

1997-1999	Mestrado Master degree
Microelectronics and Semiconductor Devices (2 anos » years) . National Technical University of Ukraine Kiev Polytechnic Institute , Ucrânia.

1993-1997	Bacharelato Bachelor degree
Electronics (4 anos » years) . National Technical University of Ukraine Kiev Polytechnic Institute , Ucrânia.

Universidade do Porto

Jun/2007-Actual

Outra Situação

Universidade de Aveiro

Dez/2005-Mai/2007

Outra Situação

Universidade de Aveiro

Out/2000-Set/2005

Outra Situação

Institute of Semiconductors Physics, National Academy of Science ofUkraine

Nov/1999-Set/2000

Outra Situação

Institute of Semiconductors Physics, National Academy of Science ofUkraine

Jul/1999-Nov/1999

Outra Situação

National Technical University of Ukraine Kiev Polytechnic Institute

Set/1993-Jun/1999

Outra Situação

Compreende Understandig	Ucraniano (Bem), Russo (Bem), Inglês (Bem), Português (Bem).
Fala Speaking	Ucraniano (Bem), Russo (Bem), Inglês (Bem), Português (Razoavelmente).
Lê Reading	Ucraniano (Bem), Russo (Bem), Inglês (Bem), Português (Razoavelmente).
Escreve Writing	Ucraniano (Bem), Russo (Bem), Inglês (Bem), Português (Razoavelmente).

2008	est Poster of the symposium Multiferroic and magnetoelectric materials of E-MRS 2008 SPRING MEETING, Strasbourg, France, E-MRS.

Artigos em revistas sem arbitragem científica Papers in periodics without scientific refereeing

1.	Tkach, A.; Almeida, A.; Moreira, J. A; Correia, T.M.; Chaves, M.R.; Okhay, O.; Vilarinho, P.M.; Gregora, I.; Petzelt, J.. 2011. "Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3", Appl. Phys. Lett., 98: 0529031 - 0529033.

2.	Okhay, O.; Wu, A.; Vilarinho, P.M.; Tkach, A.. 2011. "Dielectric relaxation of Sr1-1.5xBixTiO3 sol-gel thin films", J. Appl. Phys. , 109: 0641031 - 0641038.

3.	Tkach, A.; Vilarinho, P.M.; Nuzhnyy, D.; Petzelt, J.. 2010. "Sr- and Ti-site substitution, lattice dynamics, and octahedral tilt transition relationship in SrTiO3:Mn ceramics", Acta Mater. , 58: 577 - 582.

4.	Levin, I.; Krayzman, V.; Woicik, J.C.; Tkach, A.; Vilarinho, P.M.. 2010. "X-ray absorption fine structure studies of Mn coordination in doped perovskite SrTiO3", Appl. Phys. Lett. , 96: 0529041 - 0529043.

5.	Okhay, O.; Wu, A.; Vilarinho, P.M.; Tkach, A.. 2010. "Low temperature dielectric characterization of Mg-doped SrTiO3 thin films prepared by sol-gel", Appl. Phys. Lett. , 96: 1529061 - 1529063.

6.	Shvartsman, V.V.; Bedanta, S.; Borisov, P.; Kleemann, W.; Tkach, A.; Vilarinho, P.M.. 2010. "Spin cluster glass and magnetoelectricity in Mn-doped KTaO3", J. Appl. Phys. , 107: 1039261 - 1039268.

7.	Okhay, O.; Wu, A.; Vilarinho, P.M.; Tkach, A.. 2010. "Dielectric response of polycrystalline Sr1-1.5xBixTiO3 thin films under direct current bias", Appl. Phys. Lett. , 97: 0629121 - 0629123.

8.	Kuzian, R.O.; Laguta, V.V.; Dare, A.M.; Kondakova, I.V.; Marysko, M.; Raymond, L.; Garmash, E.P.; Pavlikov, V.N.; Tkach, A.; Vilarinho, P.M.; Hayn, R.. 2010. "Mechanisms of magnetoelectricity in manganese-doped incipient ferroelectrics", EPL, 92: 170071 - 170076.

9.	Ostapchuk, T.; Petzelt, J.; Kuzel, P.; Savinov, M.E.; Hlinka, J.; Tkach, A.; Vilarinho, P.M.; Lisenkov, S.; Ponomareva, I.; Bellaiche, L.. 2010. "Lattice dynamics in Ba0.7Sr0.3TiO3: study by THz and IR spectroscopy and ab-initio simulations", Phase Transitions , 87: 955 - 965.

10.	Kleemann, W.; Borisov, P.; Shvartsman, V.V.; Bedanta, S.; Tkach, A.; Vilarinho, P.M.. 2009. "Magnetoelectricity in multiferroically composed multilayers and multiglasses", J. Magn. Magn. Mater. , 321: 1785 - 1789.

11.	Kleemann, W.; Bedanta, S.; Borisov, P.; Shvartsman, V.V.; Miga, S.; Dec, J.; Tkach, A.; Vilarinho, P.M.. 2009. "Multiglass order and magnetoelectricity in Mn2+ doped incipient ferroelectrics", Eur. Phys. J. B , 71: 407 - 410.

12.	Ostapchuk, T.; Petzelt, J.; Hlinka, J.; Bovtun, V.; Kuzel, P.; Ponomareva, I.; Lisenkov, S.; Bellaiche, L.; Tkach, A.; Vilarinho, P.M.. 2009. "Broad-band dielectric spectroscopy and ferroelectric soft-mode response in the Ba0.6Sr0.4TiO3 solid solution", J. Phys.: Condens. Matter, 21: 4742151 - 4742159.

13.	Tkach, A.; Vilarinho, P.M.. 2008. "Scandium doped Strontium Titanate Ceramics: Structure, Microstructure, and Dielectric Properties", Bol. Soc. Espan. Ceram. Vydro, 47: 238 - 241.

14.	Tkach, A.; Vilarinho, P.M.; Reaney, I.M.. 2008. "Structure and Microstructure of Y-doped Strontium Titanate Ceramics", Microsc. Microanal. , 14: 11 - 12.

15.	Tkach, A.; Okhay, O.; Vilarinho, P.M.; Kholkin, A.L.. 2008. "High dielectric constant and tunability of strontium titanate ceramics modified by chromium doping", J. Phys.: Condens. Matter, 20: 4152241 - 4152248.

16.	Shvartsman, V.V.; Bedanta, S.; Borisov, P.; Kleemann, W.; Tkach, A.; Vilarinho, P.M.. 2008. "(Sr,Mn)TiO3 – a magnetoelectric multiglass", Phys. Rev. Lett., 101: 1657041 - 1657044.

17.	Kleemann, W.; Shvartsman, V.V.; Bedanta, S.; Borisov, P.; Tkach, A.; Vilarinho, P.M.. 2008. "(Sr,Mn)TiO3 – a magnetoelectrically coupled multiglass", J. Phys.: Condens. Matter , 20: 4342161 - 4342166.

18.	Ostapchuk, T.; Petzelt, J.; Kuzel, P.; Veljko, S.; Tkach, A.; Vilarinho, P.M.; Ponomareva, I.; Bellaiche, L.; Smirnova, E.; Lemanov, V.; Sotnikov, A.; Weihnacht, M.. 2008. "Infrared and THz soft-mode spectroscopy of (Ba,Sr)TiO3 ceramics", Ferroelectrics , 367: 139 - 148.

19.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2007. "Nonlinear dc electric-field dependence of the dielectric permittivity and cluster polarization of Sr1-xMnxTiO3 ceramics", J. Appl. Phys. , 101: 0841101 - 0841109.

20.	Trepakov, V.A.; Savinov, M.E.; Okhay, O.; Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.; Gregora, I.; Jastrabik, L.. 2007. "Dielectric permittivity and Cr3+ impurity ion probe luminescence in SrTiO3 sol–gel ceramics", J. Eur. Ceram. Soc., 27: 3705 - 3707.

21.	Laguta, V.V.; Kondakova, I.V.; Bykov, I.P.; Glinchuk, M.D.; Tkach, A.; Vilarinho, P.M.; Jastrabik, L.. 2007. "Electron-spin-resonance investigation of Mn2+ ions and their dynamics in Mn-doped SrTiO3", Phys. Rev. B, 76: 0541041 - 0541046.

22.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.; Reaney, I.M.; Pokorny, J.; Petzelt, J.. 2007. "Mechanisms of the effect of dopants and P(O2) on the improper ferroelastic phase transition in SrTiO3", Chem. Mater. , 19: 6471 - 6477.

23.	Tkach, A.; Araujo, A.B.; Vilarinho, P.M.. 2006. "The influence of dc bias on the dielectric response of Sr1-xCaxTiO3 ceramics", Mater. Sci. Forum, 514-516: 240 - 244.

24.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.; Pashkin, A.; Veljko, S.; Petzelt, J.. 2006. "Broad-band dielectric spectroscopy analysis of relaxational dynamics in Mn-doped SrTiO3 ceramics", Phys. Rev. B , 73: 1041131 - 1041137.

25.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2006. "Dependence of dielectric properties of manganese-doped strontium titanate ceramics on sintering atmosphere", Acta Mater., 54: 5385 - 5391.

26.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.; Pashkin, A.; Samoukhina, P.; Pokorny, J.; Veljko, S.; Petzelt, J.. 2005. "Lattice dynamics and dielectric response of Mg-doped SrTiO3 ceramics in a wide frequency range", J. Appl. Phys., 97: 0441041 - 0441046.

27.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2005. "Polar behavior in Mn-doped SrTiO3 ceramics", Appl. Phys. Lett. , 86: 1729021 - 1729023.

28.	Tkach, A.; Vilarinho, P.M.; Senos, A.M.R.; Kholkin, A.L.. 2005. "Effect of nonstoichiometry on the microstructure and dielectric properties of strontium titanate ceramics", J. Eur. Ceram. Soc., 25: 2769 - 2772.

29.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2005. "Structure-microstructure-dielectric tunability relationship in Mn-doped strontium titanate ceramics", Acta Mater., 53: 5061 - 5069.

30.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.; Reaney, I.M.; Petzelt, J.. 2004. "Structural and dielectric properties of Mg-doped strontium titanate ceramics: Dependence on the materials processing", Mater. Sci. Forum, 455-456: 40 - 44.

31.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2004. "Structural and dielectric properties of Mn-doped strontium titanate ceramics", Ferroelectrics , 304: 917 - 920.

32.	Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2004. "Effect of Mg doping on the structural and dielectric properties of strontium titanate ceramics", Appl. Phys. A – Mater., 79: 2013 - 2020.

33.	Trepakov, V.A.; Kudyk, I.B.; Kapphan, S.E.; Savinov, M.E.; Pashkin, A.; Jastrabik, L.; Tkach, A.; Vilarinho, P.M.; Kholkin, A.L.. 2003. "Critical phonons and impurity Cr3+ zero-phonon emission line in quantum paraelectrics: A and B-site Mg doping of SrTiO3", J. Lumin., 102: 536 - 542.

34.	Trepakov, V.A.; Savinov, M.E.; Kudyk, I.B.; Pashkin, A.; Kapphan, S.E.; Vilarinho, P.M.; Tkach, A.; Kholkin, A.L.; Jastrabik, L.. 2003. "Dielectric permittivity and Cr3+ impurity luminescence probe of Sr0.99Mg0.01TiO3 and SrTi0.99Mg0.01O3", Ferroelectrics, 294: 229 - 238.

35.	Tkach, A.; Vilarinho, P.M.; Avdeev, M.; Kholkin, A.L.; Baptista, J.L.. 2002. "Synthesis by sol-gel and characterization of strontium titanate powder", Key Eng. Mater., 230-232: 40 - 43.

Produção científica Scientific production

Total

Produção científica Scientific production

35

Artigos científicos em revistas Papers in periodics

35

Sem arbitragem científica Without scientific refereeing

35

Olena Okhay