- 著者
-
杉本 栄佑
幸塚 善作
- 出版者
- 一般社団法人 資源・素材学会
- 雑誌
- 日本鑛業會誌 (ISSN:03694194)
- 巻号頁・発行日
- vol.104, no.1200, pp.89-95, 1988
- 被引用文献数
-
2
The present study was done for the purpose of finding any available solid reference electrode for SO<SUB>2</SUB>sensor employingbeta alumina solid electrolyte. In this paper, we tried a few experiments for this sensor using two solid reference electrode, (β+β')-alumina and (α+β)-alumina.<BR>The cells used were as follows: Pt, (β+β')-alumina in air/β'-alumina/Na<SUB>2</SUB>SO<SUB>4</SUB>/SO<SUB>2</SUB>+O<SUB>2</SUB>+SO<SUB>3</SUB>, Pt (1) Pt, (α+β)-alumina in air/β-alumina/Na<SUB>2</SUB>SO<SUB>4</SUB>/SO<SUB>2</SUB>+O<SUB>2</SUB>+SO<SUB>3</SUB>, Pt (1)(11) From the present experiments, the following conclusions were obtained.<BR>1) The constant sodium activities in these solid reference electrodes were maintained for a long duration of the experiment.<BR>2) For both cells, good straight lines were obtained between e.m.f.'s and log Pso2 within the temperature ranges from 933 to 1230 K in the cell (1) and from 932 to 1278 K in the cell (11). Especially, in the (β+β')-alumina solid reference electrode, it was shown that the cell using this electrode could be employed to determine concentrations up to a few ppm of SO<SUB>2</SUB> gases at temperatures of 932 to about 1100 K. Consequently, this (β+β')-alumina mixture is recommended for the solid reference electrode ofSO<SUB>2</SUB> sensor employingβ'-alumina solid electrolyte.<BR>3) From e.m.f.'s of these cells, the activities of Na<SUB>2</SUB>O in β-Al<SUB>2</SUB>O<SUB>3</SUB>+β'-Al<SUB>2</SUB>O<SUB>3</SUB>and α-Al<SUB>2</SUB>O<SUB>3</SUB>+β-Al<SUB>2</SUB>O<SUB>3</SUB>coexistences were respectively calculated by considering thermochemical data and compared with the others.