The aim of this scientific research is determination of the peculiarities of electrochemical process and their influence on electrophysical parameters of the langatate.

We have shown the strong influence of the material of current conducting coats on electrophysical parameters of langatate (LGT, La₃Ga_5,5Ta_0,5O₁₄) samples in wide range of temperatures.

We detected short circuit current in the langatate samples without preliminary polarization. We interpreted these results according to the scientific discovery “Phenomenon of electrochemical decomposition of polar dielectric crystals” diploma № 216, priority - 18 may 1991 by Blistanov A.A., Kozlova N.S., Geras’kin V.V. registered by International Association of Authors of Scientific Discoveries. In this scientific discovery author experimentally determined new earlier unknown phenomenon of electrochemical decomposition of polar dielectric crystals – the spontaneous appearance of emf and short circuit current caused by different chemical activity of surfaces perpendicular to the polar axe.

We show that near-electrode surface processes in LGT are caused by electrochemical decomposition of polar cuts and the intension of these processes depends on growth conditions and the material of current conducting coats.

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