Ferroelectric properties of pyridinium tetrafluoroborate

P Czarnecki, W Nawrocik, Z Pajak, J Wasicki - Physical Review B, 1994 - APS
The differential thermal analysis of a single crystal of pyridinium tetrafluoroborate was
performed revealing two solid-solid phase transitions at 205 and 240 K. The real part of the …

Experimental evidence for a continuous phase transition in a multidimensional ferroelectric

P Czarnecki, A Katrusiak, I Szafraniak, J Wąsicki - Physical Review B, 1998 - APS
Two phase transitions in ferroelectric crystals of pyridinium tetrafluoroborate [C 5 H 6 N]+ BF
4− have been characterized by x-ray-and neutron-diffraction studies and measurements of …

Orientational ordering/disordering of ions accompanied by phase transitions in pyridinium tetrafluoroborate crystal

M Hanaya, H Shibazaki, M Oguni, T Nemoto… - Journal of Physics and …, 2000 - Elsevier
The heat capacities of a pyridinium tetrafluoroborate (PyHBF4) crystal were measured in the
temperature region between 6 and 372K with an adiabatic calorimeter. The crystal showed …

Neutron, nuclear magnetic resonance, and dielectric study of ion motion in pyridinium hexafluorophosphate

JW Wasicki, A Kozak, Z Pajak, P Czarnecki… - The Journal of …, 1996 - pubs.aip.org
Extensive investigation of polycrystalline pyridinium hexafluorophosphate and its
perdeuterated analog was performed by neutron scattering, NMR, and dielectric methods in …

Critical slowing down in ferroelectric pyridinium tetrafluoroborate

P Czarnecki, I Szafraniak - physica status solidi (b), 1998 - Wiley Online Library
Complex permittivity of a ferroelectric single crystal of PyBF4 was measured in the frequency
range from 1 kHz to 13 MHz. In the vicinity of ferroelectric phase transition, the phenomenon …

Ferroelectricity of pyridinium perchlorate, a molecular level point of view

D Vujosevic, K Müller, E Roduner - The Journal of Physical …, 2006 - ACS Publications
The behavior of ferroelectric and thermodynamic parameters of pyridinium perchlorate
(PyClO4) was simulated based on experimental NMR data and properties of the individual …

Computer enhancement of CW-EPR experimental spectra resolution as a new method in investigation of molecular dynamics in pyridinium tetrafluoroborate

R Krzyminiewski, RM Kowalczyk… - Journal of molecular …, 1998 - Elsevier
The present paper reports an application of the computer method for enhancing resolution of
complex CW-EPR spectra. The computer resolution enhancement method (CREM) is based …

Phase transition and complex motion of ions in pyridinium hexafluorophosphate

A Kozak, M Grottel, J Wąsicki, Z Pająk - physica status solidi (a), 1994 - Wiley Online Library
Proton and fluorine NMR second moments and spin‐lattice relaxation times are studied for
polycrystalline pyridinium hexafluorophosphate over a wide range of temperature. A solid …

Polarization and energy barriers in ferroelectric pyridinium tetrafluoroborate

Z Fojud, R Goc, S Jurga, A Kozak, J Wasicki - Molecular physics, 2003 - Taylor & Francis
Measurements of the 1H and 19F nuclear magnetic resonance (NMR) second moments
were performed for a polycrystalline sample of (PyH) BF4, whereas the shape of the 2H …

Symmetry breaking at the phase transitions in ferroelectric pyridinium salts

P Czarnecki - Phase Transitions: A Multinational Journal, 2003 - Taylor & Francis
The phase transitions in ferroelectric pyridinium tetrafluoroborate (PyBF4) and pyridinium
perchlorate (PyClO4) have been characterized by structural studies. The continuous …