In-plane and out-of-plane ferroelectric instabilities in epitaxial SrTiO3 films (2007)
Yamada, T., Petzelt, J., Tagantsev, A. K., Denisov, S., Noujni, D., Petrov, P. K., ...
Kamba, S., Nuzhnyy, D., Veljko, S., Bovtun, V., Petzelt, J., Wang, Y. L., ...
Relaxor ferroelectric PbMg_1/3Ta_2/3O_3 ceramics and thin films were investigated by means of broad-band dielectric, time-domain terahertz (THz) and Fourier-transform infrared (IR) spectroscopy in...
Kamba, S., Nuzhnyy, D., Vanek, P., Savinov, M., Knizek, K., Shen, Z., ...
Infrared reflectivity and time-domain terahertz transmission spectra of EuTiO3 ceramics revealed a polar optic phonon at 6 - 300K, whose softening is fully responsible for the recently observed...
Quantum paraelectric behavior of pyrochlore PMN (2007)
Kamba, S., Nuzhnyy, D., Denisov, S., Veljko, S., Bovtun, V., Savinov, M., ...
Pb_1.83Mg_0.29Nb_1.71O_6.39 (PMN) crystallizing in a cubic pyrochlore structure exhibits, as the first dielectrics with pyrochlore structure, typical feature of quantum paraelectrics - its...
Kamba, S., Nuzhnyy, D., Savinov, M., Sebek, J., Petzelt, J., Prokleska, J., ...
BFO3 ceramics were investigated by means of infrared reflectivity and time domain THz transmission spectroscopy at temperatures 20 - 950 K, and the magnetodielectric effect was studied at 10 - 300 K,...
Ferroelectric Soft Modes in Ceramics and Films (2006)
Petzelt, J., Kamba, S., Hlinka, J.
Ferroelectric soft mode properties in ceramics and thin films are reviewed and compared with single crystals. In general, the permittivity in ceramics and thin films is markedly reduced compared to...
Petzelt, J., Zurmuhlen, R., Bell, A., Kamba, S., Kozlov, G. V., Volkov, A. A., ...
Five Ba(B'1/2B1/2'')O3 ceramic compounds (B' = Y3+, Gd3+, Nd3+, In3+; B'' = Ta and B' = Mg2+; B'' = W6+) have been prepared to investigate the origin of microwave losses. Infrared reflectivity and...
Relation between Intrinsic Microwave and Submillimeter Losses and Permittivity in Dielectrics (2006)
Tagantsev, A. K., Petzelt, J., Setter, N.
Low-frequency losses in weakly anharmonic cubic centrosymmetric crystals as a function of permittivity are estimated using phonon kinetics approach. It is shown that very steep dependencies up to the...
B-Site Order and Infrared Reflectivity in a(B'b'')O3 Complex Perovskite Ceramics (2006)
Reaney, I. M., Petzelt, J., Voitsekhovskii, V. V., Chu, F., Setter, N.
Complex perovskite A(B'B'')O3 ceramics with various degrees of B-site order have been structurally and spectroscopically characterized by means of x-ray diffraction, transmission electron microscopy,...
Far-Infrared Dielectric Response of Pbtio3 and Pbzr1-Xtixo3 Thin Ferroelectric-Films (2006)
Fedorov, I., Petzelt, J., Zelezny, V., Komandin, G. A., Volkov, A. A., Brooks, K., ...
Far-infrared transmittance and reflectance of PbTiO3, PbZr0.53Ti0.47O3 and PbZr0.75Ti0.25O3 thin films deposited by a sol-gel technique on sapphire substrates were measured between room temperature...
Far-infrared soft-mode behavior in PbSc1/2Ta1/2O3 thin films (2006)
Kamba, S., Berta, M., Kempa, M., Hlinka, J., Petzelt, J., Brinkman, K., ...
Temperature dependences of the optic phonons in PbSc1/2Ta1/2O3 (PST) sol-gel films deposited on sapphire substrates were studied by means of Fourier transform far-infrared transmission spectroscopy...
Dynamics of polar clusters in relaxor ferroelectrics (2006)
Kamba, S., Kempa, M., Berta, M., Petzelt, J., Brinkman, K., Setter, N.
The paper brings results of far infrared transmission studies of relaxor ferroelectric PbMg1/3Nb2/3O3 and PbSc1/2Ta1/2O3 thin films performed at temperatures between 10K and 900K. The spectra clearly...
Soft and central mode behaviour in PbMg1/3Nb2/3O3 relaxor ferroelectric (2006)
Kamba, S., Kempa, M., Bovtun, V., Petzelt, J., Brinkman, K., Setter, N.
The relaxor ferroelectric PbMg1/3Nb2/3O3 (PMN) is investigated by means of dielectric and Fourier transform far infrared transmission spectroscopy in ,the frequency range from 10 kHz to 15 THz at...
Anisotropic dielectric function in polar nano-regions of relaxor ferroelectrics (2005)
Hlinka, J., Ostapchuk, T., Noujni, D., Kamba, S., Petzelt, J.
The paper suggests to treat the infrared reflectivity spectra of single crystal perovskite relaxors as fine-grained ferroelectric ceramics: locally frozen polarization makes the dielectric function...
Far-infrared soft mode behavior in PST thin films (2005)
Kamba, S., Berta, M., Kempa, M., Petzelt, J., Brinkman, K., Setter, N.
Temperature dependences of the optic phonons in $\rm PbSc_{1/2}Ta_{1/2}O_3$ sol-gel films deposited on sapphire substrates were studied by means of Fourier transform far-infrared transmission...
Central mode and soft mode behavior in PbMg1/Nb2/3O3 relaxor ferroelectric (2004)
Kamba, S., Kempa, M., Bovtun, V., Petzelt, J., Brinkman, K., Setter, N.
The relaxor ferroelectric PbMg1/Nb2/3O3 was investigated by means of broad-band dielectric and Fourier Transform Infrared (FTIR) transmission spectroscopy in the frequency range from 1 MHz to 15 THz...
High-temperature phase transitions in SrBi_2Ta_2O_9 film: a study by THz spectroscopy (2004)
Kadlec, F., Kamba, S., Kuzel, P., Kadlec, C., Kroupa, J., Petzelt, J.
Time-domain THz transmission experiment was performed on a $\rm SrBi_2Ta_2O_9$ film deposited on sapphire substrate. Temperatures between 300 and 923 K were investigated and complex permittivity...
Dielectric spectra of a new relaxor ferroelectric system Ba2LnTi2Nb3O15 (Ln=La, Nd) (2004)
Kamba, S., Veljko, S., Kempa, M., Savinov, M., Bovtun, V., Vanek, P., ...
New relaxor ferroelectric system has been synthesized. BLTN exhibits a smeared maximum of permittivity, characteristic of classic relaxor behaviour, with a peak shift from 185 K at 100 Hz to 300 K at...
Lattice Dynamics in PMN (2004)
Prosandeev, S. A., Cockayne, E., Burton, B. P., Kamba, S., Petzelt, J., Yuzyuk, Yu., ...
Lattice dynamics for five ordered PMN supercells were calculated from first principles by the frozen phonon method. Maximal symmetries of all supercells are reduced by structural instabilities....
Temperature dependence of microwave and THz dielectric response in Srn+1TinO3n+1 (n=1-4) (2004)
Noujni, D., Kamba, S., Pashkin, A., Bovtun, V., Petzelt, J., Axelsson, A-K., ...
The microwave, near-millimetre and infrared (IR) dielectric response of Srn+1TinO3n+1 (n=1-4) Ruddlesden-Popper homologous series was studied in the temperature range 10 to 300 K. Remarkable...
Pashkin, A., Zelezny, V., Savinov, M., Petzelt, J.
Chen Ang, Bhalla and Cross [Phys. Rev. B 64, 184104 (2001)] have studied the low-frequency (20 Hz -- 100 kHz) dielectric dispersion of the KTaO3 crystal under a dc electric field. Performing fits of...
Origin of the "Waterfall" Effect in Phonon Dispersion of Relaxor Perovskites (2003)
Hlinka, J., Kamba, S., Petzelt, J., Kulda, J., Randall, C. A., Zhang, S. J.
Inelastic neutron scattering study of the perovskite relaxor ferroelectric PZN:8%PT elucidates the origin of the previously reported unusual kink on the low frequency transverse phonon dispersion...
Central-Peak-Soft-Mode Coupling in Ferroelectric Gd2(MoO4)3, (2002)
Petzelt,J., Smutny,F., Katkanant,V., Ullman,F. G., Hardy,J. R.
Transmission measurements on Gd2(MoO4)3 in the (5-50)/cm region were performed with use of tunable backward-wave oscillator sources (5-30/cm) and a Fourier spectrometer (30-50/cm). The resulting...
Origin of soft-mode stiffening and reduced dielectric response in SrTiO3 thin films (2002)
Ostapchuk, T., Petzelt, J., Zelezny, V., Pashkin, A., Pokorny, J., Drbohlav, I., ...
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Far infrared response of α- and αt-(BEDT-TTF)2I3 (1990)
Železny, V., Petzelt, J., Swietlik, R., Gorshunov, B.P., Volkov, A.A., Kozlov, G.V., ...
The temperature dependence of the reflectivity of α- and α t-(BEDT-TTF)2I3 was determined in the 10-700 cm-1 range. Moreover the transmission spectra of α-phase between 10 and 33 cm-1...
Far infrared response of α- and αt-(BEDT-TTF)2I3 (1990)
Železny, V., Petzelt, J., Swietlik, R., Gorshunov, B.P., Volkov, A.A., Kozlov, G.V., ...
The temperature dependence of the reflectivity of α- and α t-(BEDT-TTF)2I3 was determined in the 10-700 cm-1 range. Moreover the transmission spectra of α-phase between 10 and 33 cm-1...
Far infrared response of α- and αt-(BEDT-TTF)2I3 (1990)
Železny, V., Petzelt, J., Swietlik, R., Gorshunov, B.P., Volkov, A.A., Kozlov, G.V., ...
The temperature dependence of the reflectivity of α- and α t-(BEDT-TTF)2I3 was determined in the 10-700 cm-1 range. Moreover the transmission spectra of α-phase between 10 and 33 cm-1...
Far infrared properties of the incommensurate ferroelectric Rb2ZnCl 4 (1982)
Petzelt, J., Volkov, A.A., Kozlov, G.V., Lebedev, S.P., Chapelle, J.P.
Dielectric spectra of Rb2ZnCl4 were determined in the 6-400 cm-1 region for 300 and 90 K. In the 30-400 cm -1 region they were evaluated from bulk reflectivity measurements, in the 6-22 cm-1 region...
Far infrared properties of the incommensurate ferroelectric Rb2ZnCl 4 (1982)
Petzelt, J., Volkov, A.A., Kozlov, G.V., Lebedev, S.P., Chapelle, J.P.
Dielectric spectra of Rb2ZnCl4 were determined in the 6-400 cm-1 region for 300 and 90 K. In the 30-400 cm -1 region they were evaluated from bulk reflectivity measurements, in the 6-22 cm-1 region...
Far infrared properties of the incommensurate ferroelectric Rb2ZnCl 4 (1982)
Petzelt, J., Volkov, A.A., Kozlov, G.V., Lebedev, S.P., Chapelle, J.P.
Dielectric spectra of Rb2ZnCl4 were determined in the 6-400 cm-1 region for 300 and 90 K. In the 30-400 cm -1 region they were evaluated from bulk reflectivity measurements, in the 6-22 cm-1 region...