Piezoelectric properties of GPI crystals

Abstract

It is found that the piezoelectric properties of glycine phosphite (GPI) were preserved up to 264 K, which contradicts the presence of a symmetry centre phase above T C . The resonance frequency jump at the phase transition was ~0.15%, which is more than ten times smaller when compared to the sound velocity jump. In order to explain such persistent behaviour of the sample, a complementary measurement of the spontaneous polarisation P s was made. Not only was P s observed up to 270 K, but two kinds of polarisation were distinguished: the first disappeared at ~226 K, and the second was present up to 270 K.

Deformation effects in glycinium phosphite ferroelectric

“…, 6); • components of effective dipole moments µ x 13 ; µ x 24 ; µ y 13 ; µ y 24 ; µ z 13 ; µ z 24 ; • "seed" dielectric susceptibilities χ ε0 i j ; • "seed" coefficients of piezoelectric stress e 0 i j ; • "seed" elastic constants c E0 i j . To determine the above listed parameters we use the measured temperature dependences for the set of physical characteristics of GPI, namely P s (T) [43], C p (T) [44], ε σ 11 , ε σ 33 [32], d 21 , d 23 [45], as well as the dependence of phase transition temperature T c (p) [46,47] on hydrostatic pressure. in the paraelectric and ferroelectric phases agree with the results of lattice dynamics simulations [48], where vibrations of the oxygen atoms connected with proton 1 (in our notations), are much more intensive than the vibrations of oxygen atoms revealed near proton 2.…”

Influence of Longitudinal Electric Field on Thermodynamic Properties of NH3CH2COOH·H2PO3 Ferroelectric

“…In [14], the experimental data are obtained for the coefficients of the piezoelectric strains 21 ( ) and 23 ( ), which have nonzero values in the paraelectric phase. They may be qualitatively explained by the existence of some internal electric field ≈1.2 MV/m in the sample (Fig.…”

Influence of electric fields on dielectric properties of GPI ferroelectric

“…To determine the above listed parameters, we use the measured temperature dependences for the set of physical characteristics of GPI, namely P s (T) [14], ε σ 11 , ε σ 33 [1], d 21 , d 23 [15], as well as the dependence of phase transition temperature T c (p) [16] on hydrostatic pressure.…”