Abstract
La2−xNdxMo1.7W0.3O9−δ (x = 0 − 0.5) and, for comparison, La2Mo2O9 compounds have been synthesized following solid state reaction technique. Temperature-dependent electrical conductivity of La2−xNdxMo1.7 W0.3O9−δ reveals suppression of the phase transition as compared to parent La2Mo2O9 compound. Partial substitution of Nd at the La site of La2Mo1.7W0.3O9−δ increases the conductivity of La2Mo1.7W0.3O9−δ in the entire temperature regime. In the intermediate temperature region (405 °C ≤ T ≤ 570 °C), the overall conductivity of La2−xNdxMo1.7W0.3O9−δ (0.1 ≤ x ≤ 0.5) is higher than that of the parent compound, and the conductivity of the compound with x = 0.1 is almost same with the La2Mo2O9 in the high temperature region (T ≥ 640 °C). Arrhenius to Vogel–Tamman–Fulcher (VTF) transition is observed in all doped specimens above 460 °C. Ion relaxation mechanism has been discussed in the framework of electrical modulus analysis in the temperature range RT–530 °C and is found to be non-Debye type of conductivity relaxation with the distribution of transition rates for hopping ions in the range of 0.60–0.70.
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