Challenge to the absolute temperature determination and improvement to the accuracy of the radiation thermometer measurement under ultra-high-temperatures

2015 Fiscal Year Final Research Report

• Project/Area Number: 25610159
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Kumamoto University
• Principal Investigator: Yoshiasa Akira 熊本大学, 自然科学研究科, 教授 (00191536)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 超高温域温度測定 / 高融点物質 / ガス浮上法 / 熱膨張特性 / 放射光X線回折実験 / 融点・相転移点

Outline of Final Research Achievements

Precise X-ray diffraction experiments were performed under ultra-high-temperature up to 4000 K using a laser heating, gas flotation atmosphere control, angle dispersive X-ray diffraction apparatus and high-energy synchrotron X-ray with the high penetrating power. We have developed a system to reduce the effect of grain growth by two-dimensional IP device detector. The diffraction data is obtained without contamination of impurities. We tried to improve the measurement accuracy of the radiation thermometers. Precise measurements were carried out for HfO2, ZrO2 baddeleyite and ZrSiO4 zircon which belong to the high-melting-point materials. Temperature measurements of radiation thermometers and X-ray depth variable diffraction experiments were performed simultaneously. ZrSiO4 zircon and ZrO2 baddeleyite are the Earth's oldest-known minerals. The phase diagram in the ZrO2-SiO2 system was proposed by re-examination of phase relationship and chemical analyses.

Free Research Field

鉱物結晶学、無機化学、凝縮系物理学