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The UV–vis–NIR and electrical conductivity σ(T) measurements of RE2W2O9 (RE=Pr, Sm–Gd) showed the insulating state and the calculated value of the direct allowed energy gap Eg>3.5eV. Thermoelectric power S(T) measurements showed the n-type conduction for Sm2W2O9 and Eu2W2O9 as well as p-type one for Pr2W2O9 and for Gd2W2O9. The I–V characteristics, measured at 300 and 400K, showed the symmetrical...
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