Ferroelectric Thin Films of Betaine Phosphite, Glycine Phosphite and of Their Deuterated Analogs

Abstract

Results of investigation of structural and dielectric properties of thin films of betaine phosphite, glycine phosphite and of their deuterated analogs are presented. The films were obtained by the evaporation method on different substrates. The ferroelectric phase transition is followed by a strong dielectric anomaly of film structures which depend on the substrate type (piezoelectric or non-piezoelectric). A strong dielectric non-linearity was observed near the phase transition in deuterated betaine phosphite films. In the films with a high deuteration degree the substitution of deuterium by hydrogen ions on the surface and interdiffusion of these ions inside the film was analyzed on the basis of dielectric measurements. Specific features of dielectric hysteresis loops for deuterated betaine phosphite and glycine phosphite film structures are discussed.

Relaxation of ferroelectric thin films of diisopropylammonium perchlorate

“…Therefore, DIPAP films can be considered to have a textured structure. 23 An improper ferroelectric 24 is different from the proper ferroelectric in terms of dielectric behavior, namely, stepwise behavior in the temperature dependence of dielectric constants corresponds to the improper ferroelectric, while a sharp peak behavior corresponds to a proper one. A switchable dielectric is a promising material in data communication, signal processing, and sensing, 25 because it could undergo transition between high and low dielectric states.…”