Investigation on Oxygen Resistance Properties of RBaCo2O5+δ Ceramics

doi:10.3724/SP.J.1077.2012.12130

Abstract

Abstract: RBaCo₂O_5+δ (R=Y, Dy, Gd, Pr, Nd, Sm, and Eu) ceramics were synthesized by the solid-state reaction method. Their resistivities depending on temperature were investigated by the standard four-probe method from room temperature to 600℃. At low temperature, all the resistivities decrease with the rising temperature, and exhibit semiconducting behavior. After the resistivities reach minimum values at certain temperatures, they increase slowly with temperature, and exhibit semimetal conducting behavior. Especially, the resistivity variations of RBaCo₂O_5+δ samples with the change of atmosphere at constant temperatures are studied. The results show that RBaCo₂O_5+δ could be potential oxygen resistance sensor materials, and that the responding rates of RBaCo₂O_5+δ are YBaCo₂O_5+δ > DyBaCo₂O_5+δ > GdBaCo₂O_5+δ > PrBaCo₂O_5+δ > NdBaCo₂O_5+δ > SmBaCo₂O_5+δ > EuBaCo₂O_5+δ. For YBaCo₂O_5+δ, the resistivity rises quickly due to the oxygen desorption when the atmosphere is switched from oxygen to nitrogen at 700℃, and reaches its maximum equilibrium value within 90 s. In addition, the resistivity drops drastically due to the oxygen adsorption when the nitrogen atmosphere is switched to oxygen, and reaches its minimum equilibrium value within 30 s.

Key words: RBaCo₂O_5+δ ceramics, surrounding oxygen pressure, varistors, sensors

CLC Number:

TB34

SONG Hong-Zhang, QIN Zhen, GAO Feng, JIA Jian-Feng, YANG De-Lin, HU Xing. Investigation on Oxygen Resistance Properties of RBaCo₂O_5+δ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(8): 887-890.

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Investigation on Oxygen Resistance Properties of RBaCo₂O_5+δ Ceramics

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