Oxidization Characteristics of Some Standard Platinum Resistance Thermometers

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概要

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• The oxidization characteristics of some standard platinum resistance thermometers are discussed on the basis of the Gibbs free energy diagram of the platinum-oxygen ensemble. The oxidization characteristics are estimated from the measurement of the resistance changes at the triple point of water. The resistance changes of thermometers are caused by pure chemical reactions of Pt to PtO2, PtO2 to PtO, and the deoxidization. The oxidized platinum of PtO on the platinum sensing wire does not grow directly from Pt but through PtO2. This hysteresis in the formation of PtO makes the resistance characteristics of the thermometers complicated, particularly in the range above 300 °C.

• 2008-10-25

著者

• SAKURAI Hirohisa

  National Research Laboratory of Metrology

• Tamura Osamu

  National Metrology Institute Of Japan Aist Central 3

• Tamura Osamu

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

• Yamaguchi Toru

  Yamatake Co., Fujisawa, Kanagawa 251-8522, Japan

• Hiura Nobuo

  Yamari Industries Ltd., Takatsuki, Osaka 569-0835, Japan

• Yoneshita Kazuya

  Yamari Industries Ltd., Takatsuki, Osaka 569-0835, Japan

• Kimura Hideo

  Yamari Industries Ltd., Takatsuki, Osaka 569-0835, Japan

• Sakurai Hirohisa

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

関連論文

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• Realization of the Triple Points of Equilibrium Hydrogen : and Equilibrium Deuterium
• Comparison of Triple Point Temperatures Realized in Two Different Types of Sealed Cells
• Oxidization Characteristics of Some Standard Platinum Resistance Thermometers

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