wizyta

od 2020-09-20

Title: Polarisation and energy barriers in ferroelectric pyridinium perchlorate

Source: Ferroelectrics

Year : 2008

Abstract:

Polycrystalline sample of pyridinium perchlorate was studied by NMR method in the temperature range from 133 to 313 K. Assuming a reorientation of pyridinium cations over inequivalent potential energy barriers in the low-temperature and intermediate phases a temperature dependence of an asymmetry parameter was determined from analysis of 2H line shape. By using the known potential shape and population of its minima, a temperature dependence of the spontaneous polarisation was calculated. The polarisation determined in this way compared with that measured by the pyroelectric effect revealed the mixed type of ferroelectricity in the crystal studied: the order-disorder and displacive one.

DOI: 10.1080/00150190802367927   (Pobrane:  2020-07-25)