| 摘要 |
PURPOSE:To enable activity of a solute element to be measured by coating an outer periphery of a solid electrolyte with a compound other than an oxide of the solute element to be measured and a sub-electrode consisting of a mixed object of an oxide of an element other than the solute element forming it. CONSTITUTION:A standard electrode 5 of a probe consists of a solid electrolyte 2, a standard pole substance 3, a standard pole lead 4, and a mixed sub-electrode 1 which is formed as a coated layer on an entire surface of the electrolyte 2. A solute element to be measured is set to Y, an element for forming a compound with Y is set to M, a compound of those is set to MYX, an oxide of M is set to MO2 (subscripts x and z indicate Y and M and a chemical stoichiometric ratio of oxygen for M) and then a layer to be coated is formed by an electrode 1 which consists of a mixture of a compound MYX other than an oxide containing an element Y to be measured and an oxide MO2 of the element M other than the element Y which constitutes this compound MYX. Then, a probe is dipped into a melted metal and oxygen divided pressure related to balanced reaction of the element Y and the electrode 1 is measured and activity of the original element Y are obtained. |
