Polar Crystals

A novel conception of piezoelectricity physical nature is proposed and dicussed. Some peculiarities of piezoelectric crystals (so cold polar-neutral crystals) would be described by a assumption of their intrinsic (latent) polarity. Its components show a critical law P ~ ( T)^n and vanish at the phase transition temperature . The critical parameter equals to n = 1 if all components of intrinsic polarity are flatness arranged (two-dimen- sional case, 2D). For spatial (3D) arrangement of the latent polarity components this exponent is n = 2. These differ essentially from 1D ferroelectric spontaneous polarization that shows P(T) critical law with the n = 0.5. For technical application, it means that under the anisotropy of boundary conditions any high-gap III-V semiconductor-piezoelectric shows a behavior of pyroelectric crystal. Such crystals might be used as far infrared sensor or as a piezoelectric sensor integrated with amplifier in one III-V crystal.

Autorentext

Poplavko Yuriy Mikhailovich, Doctor of Physical and Mathematical Sciences, Professor of Microelectronics of National Technical University of Ukraine "KPI". The founder of scientific direction "Dielectric Spectroscopy of Ferroelectrics", the author of over 200 scientific articles. Gave lectures in universities of European countries, USA, Japan, etc.