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