P
Přemysl Vaněk
Researcher at Academy of Sciences of the Czech Republic
Publications - 95
Citations - 1655
Přemysl Vaněk is an academic researcher from Academy of Sciences of the Czech Republic. The author has contributed to research in topics: Phase transition & Ferroelectricity. The author has an hindex of 22, co-authored 95 publications receiving 1520 citations. Previous affiliations of Přemysl Vaněk include Hungarian Academy of Sciences & Czechoslovak Academy of Sciences.
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Journal ArticleDOI
Dielectric, infrared, and Raman response of undoped SrTiO 3 ceramics: Evidence of polar grain boundaries
Jan Petzelt,Tetyana Ostapchuk,Ivan Gregora,I. Rychetský,Susanne Hoffmann-Eifert,A. V. Pronin,Yu. I. Yuzyuk,Boris Gorshunov,Stanislav Kamba,Viktor Bovtun,Jan Pokorný,Maxim Savinov,V. Porokhonskyy,David Rafaja,Přemysl Vaněk,A. Almeida,M. R. Chaves,A. A. Volkov,Martin Dressel,Rainer Waser +19 more
TL;DR: In this article, a theory is suggested which assumes a frozen dipole moment connected with the grain boundaries which induces the polar phase in the grain bulk in correlation with the bulk soft-mode frequency.
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High frequency dielectric properties of A5B4O15 microwave ceramics
Stanislav Kamba,Jan Petzelt,Elena Buixaderas,D. Haubrich,Přemysl Vaněk,Petr Kužel,I N Jawahar,Mailadil Thomas Sebastian,Pezholil Mohanan +8 more
TL;DR: In this paper, the microwave cavity technique was used to study high-frequency dielectric properties of A5B4O15 (A=Ba, Sr, Mg, Zn, Ca, B=Nb, Ta) ceramics.
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A multiferroic material to search for the permanent electric dipole moment of the electron
Konstantin Z. Rushchanskii,S. Kamba,Veronica Goian,Přemysl Vaněk,Maxim Savinov,Jan Prokleška,D. Nuzhnyy,K. Knížek,Frantisek Laufek,Stephen Eckel,S. K. Lamoreaux,Alexander O. Sushkov,Marjana Ležaić,Nicola A. Spaldin +13 more
TL;DR: It is computationally shown that perovskite-structure europium barium titanate should exhibit the required large and pressure-dependent ferroelectric polarization, local magnetic moments and absence of magnetic ordering at liquid-helium temperature.
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Polar phonon mixing in magnetoelectric EuTiO3
Veronica Goian,S. Kamba,Jiří Hlinka,Přemysl Vaněk,Alexei A. Belik,Taras Kolodiazhnyi,Jan Petzelt +6 more
TL;DR: In this article, the infrared reflectivity spectra of antiferromagnetic incipient ferroelectric (EuTiO3) were investigated up to 600 K and three polar phonons typical for the cubic perovskite $Pm\bar {3}m$ structure were observed.
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Broadband dielectric response and grain-size effect in K0.5Na0.5NbO3 ceramics
Elena Buixaderas,V. Bovtun,Martin Kempa,Maxim Savinov,Dmitry Nuzhnyy,Filip Kadlec,Přemysl Vaněk,Jan Petzelt,M. Eriksson,Zhijian Shen +9 more
TL;DR: In this article, the authors measured the dielectric spectra of two K.5Na0.5NbO3 ceramics with different grain sizes (10 and 0.5μm) in a broad temperature range.