Oxidization Characteristics of Standard Platinum Resistance Thermometers

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概要

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• The oxidization characteristics of a standard platinum resistance thermometer are discussed. A platinum sensing wire is oxidized by oxygen in a thermometer sheath, such as PtO2 or PtO, depending on temperature below 500 °C. The platinum oxide PtO2 is confirmed to be formed spontaneously in the sensing wire in a temperature range below 300 °C. In this temperature range, the area of the platinum oxide below the surface of the sensing wire is divided into two parts, i.e., the PtO2 area near the surface and the PtO area below it, the boundary of which depends on the diffusion depth of oxygen. The platinum oxide PtO is also confirmed to be spontaneously formed from Pt above 300 °C, after a certain amount of PtO is formed in the sensing wire with the help of PtO2.

• 2011-03-25

著者

• Sakurai Hirohisa

  National Metrology Institute of Japan, AIST, Tsukuba, Ibaraki 305-8563, Japan

関連論文

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