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首页> 外文期刊>Materials Chemistry and Physics >Oxygen gas-sensing properties of V_2O_5-Sb_2O_3-TeO_2 glass
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Oxygen gas-sensing properties of V_2O_5-Sb_2O_3-TeO_2 glass

机译：V_2O_5-Sb_2O_3-TeO_2玻璃的氧气传感特性

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摘要

The oxygen gas-sensing behavior, as measured by the d.c. conductivity σ, of 62.3V_2O_5 · 4.3Sb_2O_3 · 33.3TeO_2 glass (mol%) prepared by press-quenching was studied in Ar and O_2 gas atmospheres at temperatures between 303 and 473 K. The glass was n-type semiconducting. The conductivity was lower in O_2 and higher in Ar than that in air. The explanation for this was that V~(4+) ions in the glass were oxidized by the O_2 gas which had diffused into the glass, resulting in an increase in V~(5+) with time. The experimental relationship between σ and the oxygen partial pressure P_(O_2) agreed quantitatively with the theoretical relation σ ∝ P_(O_2)~(-1/4). Variations in conductivity on switching the atmospheres between O_2 and Ar gases were found to be reproducible, and the O_2 gas sensitivity S at 473 K was found to be 1.2. These dynamic changes could be explained quantitatively by an oxygen diffusion model. From discussions on the gas-sensing behavior, the present glass was revealed to be potentially applicable as an O_2 gas sensor.
机译：直流电测量的氧气感应行为在303和473 K之间的Ar和O_2气氛中研究了通过压淬制备的62.3V_2O_5·4.3Sb_2O_3·33.3TeO_2玻璃（mol％）的电导率σ。该玻璃为n型半导体。与空气相比，O_2中的电导率较低，而Ar中的电导率较高。对此的解释是玻璃中的V〜（4+）离子被扩散到玻璃中的O_2气体氧化，导致V〜（5+）随时间增加。 σ和氧分压P_（O_2）之间的实验关系与理论关系σ∝P_（O_2）〜（-1/4）定量地一致。发现在O_2和Ar气体之间切换气氛时电导率的变化是可再现的，并且在473 K下的O_2气敏度S为1.2。这些动态变化可以通过氧扩散模型定量解释。通过对气体感应行为的讨论，发现本发明的玻璃有可能用作O_2气体传感器。

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