Electrical conductivity of BaB2O4 single crystals

V.T.Adamiv, Ya.V.Burak, I.V.Garapyn*, I.M.Teslyuk*

Institute of Physical Optics, 23 Dragomanov str., 79005 Lviv, Ukraine *Physical Department, Lviv State University, 50 Dragomanov str., 79005 Lviv, Ukraine

Received June 1, 1999

Conductivity measurements of beta-BaB2O4 and alpha-BaB2O4 single crystals were performed in temperature range 300-900 K. Temperature dependencies of conductivity for both modifications are very similar at temperature below 500 K and they in some extent are different at higher temperatures. The activation energy values are evaluated for straight-line segments of lgsigma = f(103/T) dependences. The discussion of results evidences that conductivity has electronic nature at temperatures below 500 K, but an ionic component is dominant at temperatures above 700 K.

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