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The electrical conductivity of Tl 3 BX 4 -crystals (B = V, Nb, Ta; X = S, Se) has been determined in the temperature range between 20 and 200°C. It turned out that the compounds are semiinsulating with conductivities  σ  at 20°C between 1.2 × 10 −5  (Tl 3 VSe 4 ) and 2.5 × 10 −8  ( Ω cm) −1  (Tl 3 NbS 4 ). They are mixed conductors. T1 3 VS 4 , Tl 3 NbS 4  and Tl 3 VSe 4  show Tl +  ionic conduction at room temperature. Very strong piezoelectric effects of the crystals have been observed.

Electrical properties of Tl 3 BX 4 crystals (B = V, Nb,Ta;X = S, Se)