Electrical conductivity and stimulated thermo-current studies on VO2+ doped Li(N2H5)SO4 single crystals

Abstract

Dc conductivity and stimulated thermo‐current (STC) studies on VO2+ doped lithium hydrazinium sulphate Li(N2H5)SO4 are reported. The activation energies obtained from conductivity studies in extrinsic and intrinsic regions are found to be 0.65 and 0.84 eV. A pair of STC peaks occurring both at low and high temperature regions with activation energies of 0.40 and 0.88 eV, respectively, are recorded. The variation in these energies with temperature is explained on the basis of a “one‐dimensional conductor” model of this crystal, and the interchannel jumps of proton vacancies formed due to the divalent impurity. Large values of l/τ0 may be due to the dynamics of hydrogen groups in this system.