MANUFACTURE OF DETECTING ELEMENT OF GASEOUS ALCOHOL

PURPOSE:To obtain a highly sensitive alcohol detecting element, by incorporating each oxide of Cr, Mg, Zr components and satisfying a prescribed equation in terms of the mol ratio of Zr component and also, calcining so that the average value of half-value width of specific two faces X-ray diffraction of the oxides is requlated to a specific range. CONSTITUTION:The titled element contains the oxides of Cr, Mg, Cr and each oxide is permissible to exist independently or mixedly in various oxidation forms according to the valency and in case when the mol ratio is expressed in Mc, Mm, Mz expressed in terms of each CrO3, MgO, ZrO2 the molar fraction MZ is shown by equation in figure and moreover, the oxides are so regulated that the average value of half-value width of each specific two faces of Cr, Zr oxides is in a specific range, and the average value of the half-value width of X-ray diffraction of 2, 0, 0 and 2, 2, 2 faces of magnesium oxide is 0.30-0.50 deg.. A pair of platinum electrodes is embedded in a mixture of said three oxides and high pressure molding is carried out. Then, a molded product is calcined in the range of 1,000-1,400 deg.C and the detecting element highly sensitive and stable only for gaseous alcohol is obtained.