Formation of the Unipolar State in Hydrogenous Ferroelectric Crystals

Abstract

In the work some regularities of influence of an impurity distribution on processes of the unipolar state formation in ferroelectric hydrogenous crystals are considered. Possibility of obtaining crystals with high unipolarity and stable pyroelectric characteristics is demonstrated on the example of triglycine sulphate (TGS) and Rochelle salt (RS) crystals with tailored profile distribution of the impurities of chromium (Cr³⁺) and copper (Cu²⁺) ions, respectively. It is ascertained that the impurity gradient promotes formation of the internal bias fields and increase of the unipolarity coefficients and of the pyroelectric characteristics of TGS crystals.

Keywords:

• Ferroelectric hydrogenous crystals
• crystals with the impurity gradient
• internal fields
• unipolarity