wizyta

od 2020-09-20

Title: Polarisation and energy barriers in ferroelectric pyridinium tetrafluoroborate

Source: Molecular Physics

Year : 2003

Abstract:

The measurements of 1H and 19F NMR second moment were performed for a polycrystalline sample of (PyH)BF4, whereas the shape of 2H NMR line was analysed for a polycrystalline sample of (d5PyH)BF4. Asymmetry parameter D has been calculated for four models of pyridinium cation reorientation among inequivalent potential energy minima, using experimental value of 1H NMR second moment as well as the 2H NMR line width. Knowing the potential shape and the population of its minima the temperature dependence of polarisation for all the models has been found. From the comparison of the experimentally determined polarisation with the calculated one the most appropriate model of the pyridinium cation reorientation has been chosen.

DOI: 10.1080/0026897031000082167   (Pobrane:  aktualizowanie)