Results 171 to 180 of about 4,043 (219)

The Electrochemistry of Chromium (III) in Molten KSCN

Journal of The Electrochemical Society, 1986
Etudes de la reduction d'ion chrome (III), dans du thiocyanate de potassium fondu, par voltammetrie cyclique, avec une electrode a disque tournant et a l'aide de la methode du saut de potentiel.
R. J. Potter, D. J. Schiffrin
openaire   +1 more source

New data on the phase transition in KSCN

Ferroelectrics, 1988
Abstract The structural phase transition in single crystals of KSCN which can be classified as improper ferroelastic, has been investigated by accurate birefringence measurements, Brillouin scattering and far infrared spectroscopy. The optical study showed the transition to be of first order.
J. Kroupa, J. Fousek, A. Fousková, J. Petzelt, M. Pavel, S. Kamba, A. Fuith, H. Warhanek   +7 more
openaire   +1 more source

KSCN and its phase transition at 415K

Ferroelectrics, 1990
Abstract The order-disorder phase transition of KSCN at 415K has been investigated by birefringence-, ultrasonic-, dielectric-and NMR-measurements. A pseudospin model which takes into account the interaction between the four pseudospins S1, S2, S3 and S4 corresponding to the four SCN-ions in the unit cell has been calculated and used to describe the ...
A. Fuith, H. Kabelka, W. Schran, H. Warhanek, R. Blinc, J. Kroupa, V. Janovec   +6 more
openaire   +1 more source

Symmetry analysis of domain structure in KSCN crystals

Ferroelectrics, 1989
Abstract Basic symmetry properties of domain states, domain pairs, domain twins and walls in KSCN crystals are examined by group theoretical methods. Relations between domain states and domain pairs are expressed in matrix form and by permutation representation.
V. Janovec, W. Schranz, H. Warhanek, Z. Zikmund   +3 more
openaire   +1 more source

The order-disorder phase transition in kscn

Ferroelectrics, 1991
Abstract The order-disorder phase transition in KSCN near 417.5 K, which is connected with the head-tail orientation of the linear SCN-molecules, is investigated by diffuse neutron scattering techniques. The results show a transition from a long range ordered structure to a short range ordered state which persists up to temperatures near the melting ...
O. Blaschko, W. Schwarz, W. Schranz, A. Fuith   +3 more
openaire   +1 more source

Far infrared spectroscopy of the phase transition in KSCN

Ferroelectrics, 1990
Abstract Polarized reflectivity and transmissivity of KSCN were measured in the spectral range 6–650 cm−1 and temperature region 15–430 K. The absorption at ν < 100 cm−1 for temperatures down to 100-200 K is several times greater than it would follow from t fit of the reflectivity to a sum of classical oscillators.
S. Kamba, J. Petzelt, S. P. Lebedev, A. A. Volkov, A. Fuith, H. Warhanek   +5 more
openaire   +1 more source

The vibrational spectrum of crystalline KSCN

Journal of Applied Spectroscopy, 1965
The spectrum is reported for the range 700 to 5000 cm−1; the internal modes of the SCN− ion are interpreted in terms of the Cs local symmetry group. The combinations of internal and external (lattice) modes are examined in terms of theD2h factor group. The frequency of the translational mode is found to be 20 cm−1.
openaire   +1 more source

ELECTRONIC STRUCTURE AND CHEMICAL BOND IN KN3 AND KSCN CRYSTALS

Журнал структурной химии, 2015
Crystal structure parameters, band spectra, distribution maps of the toal and partial electron densities of KN3 and KSCN are calculated from the first principles using the density functional method and the general properties and distinctions in the band spectra are analyzed. The groups of balance subbands are qualitatively similar; in the upper valence
N. G. Kravchenko, A. S. Poplavnoi
openaire   +2 more sources

Solution growth of large, high quality KSCN crystals

Journal of Crystal Growth, 1989
Abstract Acetone turned out to be a proper solvent for the growth of large high quality KSCN crystals. A method for the purification of the solution is described together with an experimental set-up for the growth. The habit of the crystals is significantly different for crystals grown out of acetone and out of methanol.
A. Fuith, T. Streuselberger, H. Warhanek
openaire   +1 more source

Birefringence study of the 415 K phase transition in KSCN

Journal of Physics: Condensed Matter, 1990
KSCN shows an order-disorder phase transition at 415 K. Accurate measurements of the birefringence in the temperature range from room temperature to 420 K support the validity of the Ising model with volume-dependent interactions. The temperature dependence of the birefringence is well correlated with the structural changes as predicted by the ...
A Fuith, J Kroupa
openaire   +1 more source