The Preparation of Pure and Phosphrous-Doped La₂Mo₂O₉ Oxide Ion Conductor by a Modified Precipitation Method

Abstract:

Lanthanum molybdate, La₂Mo₂O₉, has been attracted considerable attention owing to its high concentration of intrinsic oxygen vacancies. In this paper, pure and phosphrous-doped La₂Mo₂O₉ (LAMOX) is prepared by means of a modified precipitation method. The properties of the series of compounds have been characterized by thermal analysis (TGA-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and conductivity measured by a.c. impedance spectroscopy (IS). The electrical conductivity of pure La₂Mo₂O₉ prepared by this method reaches a value of 0.15 S/cm at 800 °C, much higher than that of the sol-gel prepared material. P-doped La₂Mo₂O₉ underwent a slightly structural phase transition, and the transition temperature is found to decrease with increasing P content. Electrical conductivity measurements show a slightly increase in the conductivity at low temperature after the tiny doping of P.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 963-968
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.963
• Online since: April 2016
• Authors: Qin Li, Feng Yang Dai, Li Wei Zhang, Li Guo Jin, Yong Liang Wang
• Keywords: Ceramics, Electrical Conductivity, Microstructure, Phase Transitions

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