Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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Naji, M.
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Tkach, A.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (29/29 displayed)

  • 2023Low-temperature solution processing route for potassium sodium niobate (KNN) thin films2citations
  • 2019Tuning electrical and thermoelectric properties of freestanding graphene oxide papers by carbon nanotubes and heat treatment14citations
  • 2018Mechanical strain engineering of dielectric tunability in polycrystalline SrTiO3 thin films18citations
  • 2016Thin film versus paper-like reduced graphene oxide: Comparative study of structural, electrical, and thermoelectrical properties18citations
  • 2015Drastic modification of graphene oxide properties by incorporation of nickel: a simple inorganic chemistry approach1citations
  • 2012Low-temperature dielectric response of NaTaO3 ceramics and films26citations
  • 2011Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO.sub.3./sub.28citations
  • 2011Role of trivalent Sr substituents and Sr vacancies in tetragonal and polar states of SrTiO342citations
  • 2011Lithium-induced dielectric relaxations in potassium tantalate ceramics9citations
  • 2011Lithium-induced dielectric relaxations in potassium tantalate ceramics9citations
  • 2011Role of trivalent Sr substituents and Sr vacancies in tetragonaland polar states of SrTiO.sub.3./sub.42citations
  • 2011Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO328citations
  • 2008High dielectric constant and tunability of strontium titanate ceramics modified by chromium doping21citations
  • 2007Nonlinear dc electric-field dependence of the dielectric permittivity and cluster polarization of Sr1-x Mnx TiO3 ceramics31citations
  • 2007Mechanisms of the effect of dopants and P(O-2) on the improper ferroelastic phase transition in SrTiO333citations
  • 2007Dielectric permittivity and Cr3+ impurity ion probe luminescence in SrTiO3 sol-gel ceramics7citations
  • 2006Broad-band dielectric spectroscopy analysis of relaxational dynamics in Mn-doped SrTiO3 ceramics90citations
  • 2006Dependence of dielectric properties of manganese-doped strontium titanate ceramics on sintering atmosphere74citations
  • 2005Lattice dynamics and dielectric response of Mg-doped SrTiO 3 ceramics in a wide frequency range41citations
  • 2005Polar behavior in mn-doped SrTiO3 ceramics93citations
  • 2005Structure-microstructure-dielectric tunability relationship in Mn-doped strontium titanate ceramics110citations
  • 2005Effect of nonstoichiometry on the microstructure and dielectric properties of strontium titanate ceramics54citations
  • 2004Effect of Mg doping on the structural and dielectric properties of strontium titanate ceramics41citations
  • 2004Structural and dielectric properties of Mg-doped strontium titanate ceramics: Dependence on the materials, processingcitations
  • 2004Structural and dielectric properties of Mn-doped strontium titanate ceramics25citations
  • 2004Structural and dielectric properties of Mg-doped strontium tltanate ceramics: Dependence on the materials processingcitations
  • 2003Dielectric permittivity and Cr3+ impurity luminescence of Sr0.99 Mg0.01 TiO3 and SrTi0.99 Mg0.01 O3citations
  • 2003Critical phonons and R- zero-phonon emission line of Cr3+ in Mg-doped SrTiO36citations
  • 2002Synthesis by sol-gel and characterization of strontium titanate powdercitations

Places of action

Chart of shared publication
Hortigüela, M. J.
1 / 3 shared
Calzada, M. L.
1 / 24 shared
Costa, M. E.
1 / 1 shared
Vilarinho, P. M.
14 / 42 shared
Ivanov, M.
1 / 16 shared
Bretos, Íñigo
1 / 6 shared
Pinho, Rui
1 / 2 shared
Jiménez, Ricardo
1 / 11 shared
Otero-Irurueta, G.
1 / 7 shared
Goncalves, Lmv
1 / 1 shared
Vieira, Emf
1 / 4 shared
Okhay, O.
9 / 11 shared
Goncalves, G.
2 / 8 shared
Ventura, Joao
3 / 38 shared
Dias, C.
2 / 14 shared
Reaney, I. M.
2 / 44 shared
Titus, E.
2 / 19 shared
Valente Goncalves, Lmv
1 / 1 shared
Ribeiro Da Silva, Mfr
1 / 1 shared
Krishna, R.
1 / 21 shared
Klaeui, M.
1 / 2 shared
Gracio, Jja
1 / 2 shared
Guerra, Lm
1 / 3 shared
Romaguera Barcelay, Y.
1 / 7 shared
Agostinho Moreira, Ja
2 / 29 shared
Perez De La Cruz, Jp
1 / 8 shared
Almeida, A.
7 / 78 shared
Vilarinho, Pm
12 / 24 shared
Moreira, J. A.
2 / 14 shared
Gregora, I.
5 / 23 shared
Chaves, M. R.
3 / 11 shared
Correia, T. M.
2 / 11 shared
Petzelt, J.
9 / 45 shared
Chaves, Mr
3 / 5 shared
Correia, Tm
2 / 3 shared
De La Cruz, Jp
1 / 4 shared
Espinha, A.
2 / 4 shared
Moreira, Ja
2 / 24 shared
Agostinho Moreira, J.
1 / 3 shared
Perez De La Cruz, J.
1 / 1 shared
Kholkin, Al
6 / 69 shared
Kholkin, Andrei L.
11 / 435 shared
Reaney, Im
2 / 5 shared
Pokorny, J.
2 / 10 shared
Okhay, I.
1 / 1 shared
Savinov, Me
1 / 1 shared
Trepakov, Va
1 / 1 shared
Jastrabik, L.
3 / 14 shared
Pashkin, A.
4 / 10 shared
Veljko, S.
2 / 4 shared
Samoukhina, P.
1 / 3 shared
Senos, A. M. R.
1 / 6 shared
Trepakov, V. A.
2 / 6 shared
Kapphan, S. E.
2 / 3 shared
Kudyk, I. B.
2 / 2 shared
Savinov, M. E.
2 / 4 shared
Baptista, Jl
1 / 6 shared
Avdeev, M.
1 / 23 shared
Chart of publication period
2023
2019
2018
2016
2015
2012
2011
2008
2007
2006
2005
2004
2003
2002

Co-Authors (by relevance)

  • Hortigüela, M. J.
  • Calzada, M. L.
  • Costa, M. E.
  • Vilarinho, P. M.
  • Ivanov, M.
  • Bretos, Íñigo
  • Pinho, Rui
  • Jiménez, Ricardo
  • Otero-Irurueta, G.
  • Goncalves, Lmv
  • Vieira, Emf
  • Okhay, O.
  • Goncalves, G.
  • Ventura, Joao
  • Dias, C.
  • Reaney, I. M.
  • Titus, E.
  • Valente Goncalves, Lmv
  • Ribeiro Da Silva, Mfr
  • Krishna, R.
  • Klaeui, M.
  • Gracio, Jja
  • Guerra, Lm
  • Romaguera Barcelay, Y.
  • Agostinho Moreira, Ja
  • Perez De La Cruz, Jp
  • Almeida, A.
  • Vilarinho, Pm
  • Moreira, J. A.
  • Gregora, I.
  • Chaves, M. R.
  • Correia, T. M.
  • Petzelt, J.
  • Chaves, Mr
  • Correia, Tm
  • De La Cruz, Jp
  • Espinha, A.
  • Moreira, Ja
  • Agostinho Moreira, J.
  • Perez De La Cruz, J.
  • Kholkin, Al
  • Kholkin, Andrei L.
  • Reaney, Im
  • Pokorny, J.
  • Okhay, I.
  • Savinov, Me
  • Trepakov, Va
  • Jastrabik, L.
  • Pashkin, A.
  • Veljko, S.
  • Samoukhina, P.
  • Senos, A. M. R.
  • Trepakov, V. A.
  • Kapphan, S. E.
  • Kudyk, I. B.
  • Savinov, M. E.
  • Baptista, Jl
  • Avdeev, M.
OrganizationsLocationPeople

article

Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3

  • Chaves, Mr
  • Correia, Tm
  • Gregora, I.
  • Almeida, A.
  • Okhay, O.
  • Tkach, A.
  • Vilarinho, Pm
  • Petzelt, J.
  • Moreira, Ja
Abstract

The effect of Sr vacancies on the behavior of strontium titanate with trivalent dopants (La3+, Gd3+, and Y3+) substituting Sr2+ ions is reported. A remarkable shift of the antiferrodistortive transition temperature T-a is revealed by Raman spectroscopy for just a small content of dopant. It is shown that a unique linear dependence of Ta versus tolerance factor is obtained when Sr-vacancies are taken into account. A vacancy size value of similar to 1.54 angstrom is estimated, which is similar to 7% larger than Sr2+ radius. This size difference enables explaining the unexpected increase of lattice parameter with increasing Bi3+ content in Sr1-1.5xBixTiO3. (C) 2011 American Institute of Physics. [doi:10.1063/1.3549181]

Topics
  • impedance spectroscopy
  • Strontium
  • Raman spectroscopy
  • vacancy