Abstract
La 2-x Nd x Mo 1. 7 W 0. 3 O 9-δ (x = 0 - 0. 5) and, for comparison, La 2 Mo 2 O 9 compounds have been synthesized following solid state reaction technique. Temperature-dependent electrical conductivity of La 2-x Nd x Mo 1. 7 W 0. 3 O 9-δ reveals suppression of the phase transition as compared to parent La 2 Mo 2 O 9 compound. Partial substitution of Nd at the La site of La 2 Mo 1. 7 W 0. 3 O 9-δ increases the conductivity of La 2 Mo 1. 7 W 0. 3 O 9-δ in the entire temperature regime. In the intermediate temperature region (405 °C ≤ T ≤ 570 °C), the overall conductivity of La 2-x Nd x Mo 1. 7 W 0. 3 O 9-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 La 2 Mo 2 O 9 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.
| Original language | English |
|---|---|
| Pages (from-to) | 747-757 |
| Number of pages | 11 |
| Journal | Ionics |
| Volume | 18 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2012 Sept 1 |
Keywords
- Doping
- Electrical modulus
- Impedance spectroscopy
- Ionic conduction
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)