Visualization of static and the dynamics of domain structure in triglycine sulfate by liquid crystals

Abstract

A method of visualizing the 18O"-domain structure in TGS type crystals by means of nematic liquid crystals (NLC) is described. The possibility of visualization is due to the different orientation of NLC molecules on the domains with opposite orientation. The method enables the observation of static domain structure on cleaved surfaces of TGS and domain dynamics on polished and etched surfaces. The temperature and DC-field dependences of domain motion are similar to those previously revealed by indirect methods. The AC-dependences of domain nucleation and sideward motion of domain walls are shown to be quite different in TGS crystals grown in the paraelectric and ferroelectric phases. In the latter the existence of a row structure of centres of nucleation was observed which do not coincide with growth layers.

Dynamics of Domains in NaNO2Crystals

“…Mere we communicate the results of our observations of peculiarities of domain dynamics in ΝaΝO2 crystals using the nematic liquid crystal -(NLC) method [5] in a wide range of the external electric fields.…”

Effect of Ni doping on ferroelectric and dielectric properties of strontium barium niobate crystals

“…In the region, where reorientation of polarization direction takes place, switching current flows followed by a decrease in the impedance of the ferroelectric crystal; hence, the major part of the applied voltage falls on the NLC layer. Thus, the regions where reorientation of domains still occurs look somewhat darker, as in these regions a certain electrohydrodynamic instability, particularly dynamic scattering, takes place [24]. Some limitations of this method are connected with a slow response time of NLC molecules (of the order of several ms).…”

Domain Pattern Evolution in Polarization Reversal of Telluric Acid Ammonium Phosphate Crystals

“…[4,5]. To observe the domains we used the nematic phase of p-methoxybenzylidene-p-n-butylaniline (MBBA) and p-ethoxybenzylidene-p-n-butylaniline (EBBA) mixtures.…”