Citation: XU Jia, ZHANG Ming, XU Jian-Hong, MA Gui-Lin. Synthesis and Electrical Properties of La₂(Mo_1-xV_x)₂O_9-α[J]. Acta Physico-Chimica Sinica, ;2011, 27(04): 863-868. doi: 10.3866/PKU.WHXB20110408 shu

Synthesis and Electrical Properties of La₂(Mo_1-xV_x)₂O_9-α

1.
Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu Province, P. R. China

Received Date: 17 December 2010
Available Online: 1 March 2011
Fund Project: 国家自然科学基金(20771079)资助项目 (20771079)

A series of ceramic samples La₂(Mo_1-xV_x)₂O_9-α (x = 0.02, 0.04, 0.06, 0.08) were synthesized by a solid-state reaction method. X-ray powder diffraction (XRD) patterns show that all the ceramic samples have a single cubic structure. The conductive properties of the ceramic samples were investigated using gas concentration cells and electrochemical impedance spectroscopy at 823-1123 K. All the samples have completely suppressed the phase transition, which occurs in La₂Mo₂O₉ at around 853 K. The ceramic samples are almost pure oxide-ionic conductors and do not possess the protonic conduction in dry and wet oxygen atmospheres. The oxide-ionic conductivity (σ) is affected by the doping level, and increases as follows: σ(x=0.02)<σ(x=0.08)<σ(x = 0.06)<σ(x=0.04). This order is consistent with that of the free volume of the crystal lattice. La₂(Mo_0.96V_0.04)₂O_9-α has the highest oxide-ionic conductivity of 0.051 S·cm^-1. The dependence of conductivity on oxygen partial pressure reveals that the samples are almost pure oxide-ionic conductors in the high oxygen partial pressure range whereas they exhibit mixed ionic and electronic conduction in the low oxygen partial pressure range.
- Oxide-ionic conductor,
- La₂Mo₂O₉,
- Protonic conduction,
- Gas concentration cell,
- Electrochemical impedance spectroscopy
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Synthesis and Electrical Properties of La₂(Mo_1-xV_x)₂O_9-α