Dielectric relaxation and conduction mechanism in LaNi3/4M1/4O3 (MÂ =Â Mo, W) at low temperature

▶ Electrical transport in LaNi3/4Mo1/4O3 and LaNi3/4W1/4O3 takes place due to polaron hopping. ▶ Polaron hopping energy is higher in LaNi3/4W1/4O3 than LaNi3/4Mo1/4O3 due to large band gap. ▶ ac conductivity spectra for both the materials follow the universal power law.