Ngk Spark Plug Company, Limited

Kohei Ito

Takeshi Mitsuoka

Katsuya Yamagiwa

Masato Yamazaki

Kenji Kato

Yasuhiro Fujii

A gas sensor including a reduction section () for reducing NOcontained in exhaust gas to NO. The reduction section () is provided on the upstream side of a first diffusion resistor section () which limits the flow of the exhaust gas into a first measurement chamber (). When NOpasses through the first diffusion resistor section (), NOwhich has a greater molecular weight than NO has a lower degree of diffusion. Since NOis reduced to NO at the reduction section (), the exhaust gas passing through the first diffusion resistor section () hardly contains NO. Therefore, the speed of flow of NOthrough the first diffusion resistor section () is not limited by NO, whereby sensitivity for detection of NOcan be improved.

Gas sensor

There are provided a piezoelectric ceramic composition that includes a bismuth layer-structured compound, which contains Na, Bi, Co and Ln (lanthanoide), as a main component and a piezoelectric ceramic composition that includes a compound, which contains Na, Bi, Ti, Co and Ln (lanthanoide) and has a NaBiTiOtype crystal structure, as a main component, wherein the piezoelectric ceramic composition has an atomic ratio of 0&#x3c;Ln/(Na+Bi+Ln)&#x2266;0.04.

Piezoelectric ceramic composition and piezoelectric device

There is provided a piezoelectric ceramic composition that contains Na, Bi, Ti and Co wherein the composition ratio of Na, Bi, Ti and Co in terms of oxides thereof is in the following composition range (1):NaO-BiO-TiO-CoO&#x2003;&#x2003;(1)where a, b, c and d are mole fractions; 0.03&#x2266;a&#x2266;0.042; 0.330&#x2266;b&#x2266;0.370; 0.580&#x2266;c&#x2266;0.620; 0&#x3c;d&#x2266;0.017; and a+b+c+d=1.

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Komaki, Japan

Kohei Ito