Abstract
Layered hydrated tungsten trioxide with orthorhombic phase is prepared by a hydrothermal method in an acidic environment. Dielectric studies reveal the presence of space charge and ionic polarizations in the as-prepared samples at different temperatures and frequencies. The scaling behavior shows the gradual shifting of space charge to ionic polarization at 343 K. Impedance along with phase measures a shift from purely resistive to capacitive for the sample with an increase in frequency above 343 K. Modular dispersion spectra suggest that electrical transport and conductivity relaxation occur in the material. Nyquist plots are drawn from impedance and modulus data and the activation energies calculated show a transition from metallic to insulating around 343 K. Comparison of variation of imaginary parts of impedance and modulus with frequency shows the movement of grain boundaries to grain, which supports the transition.
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