Enhancement of Gas Sensitivity by Controlling Microstructure ofα-Fe_2O_3 Ceramics

概要

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We have found that the gas sensitivity of α-Fe_2O_3 ceramics can be greatly enhanced by controlling its microstructure by adding quadrivalent Ti, Zr or Sn. These metals have the effect on suppressing the grain growth and crystallization, and consequently increasing the specific surface area of the sensing element. With Sn in particular, the sensing element consists of ultra-fine grains as small as about 100 A and has an extremely large specific surface area of 125 m^2/g. However, the additives are effective only in the presence of the sulfate ion, which is considered to localize mainly on the surface of the α-Fe_2O_3 grains. Thus the surface of the grains, which is fairly amorphous, is thought to play an essential role in the gas sensitive mechanism.
社団法人応用物理学会の論文
1983-06-20