1999 Fiscal Year Final Research Report Summary
Measurement and control of temperature in the laser-heated diamond anvil cell
| Project/Area Number |
09304053
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Okayama University |
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Principal Investigator |
WALTER Micheal Institute for Study of the Earth's Interior, Okayama University, Associate Professor, 固体地球研究センター, 助教授 (20284094)
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| Co-Investigator(Kenkyū-buntansha) |
KATSURA Tomoo Institute for Study of the Earth's Interior, Okayama University, Associate Professor, 固体地球研究センター, 助教授 (40260666)
KANZAKI Masami Institute for Study of the Earth's Interior, Okayama University, Associate Professor, 固体地球研究センター, 助教授 (90234153)
ITO Eiji Institute for Study of the Earth's Interior, Okayama University, Professor, 固体地球研究センター, 教授 (00033259)
NAKAMURA Eizo Institute for Study of the Earth's Interior, Okayama University, Professor, 固体地球研究センター, 教授 (80201672)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Diamond Anvil Cell / Laser Heating / Spectroradiometry / Temperature Control / Temperature Measurement / Melting of Pt / Melting of Fe |
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| Research Abstract |
A system for laser heating in the diamond anvil cell has been installed at the Institute for Study of the Earth's Interior. The system provides for double-sided heating by focusing radiation from a 150 watt multi-mode CW Nd : YAG laser through both diamond anvil windows. Laser power is controlled using the optical emission from the heated sample as input for a negative feedback system, and high temperatures (2000 K) can be maintained for tens of minutes at a precision of about ±30 K.
Blackbody temperatures are measured by spectroradiometry using a spectrometer equipped with an array fomat Si-CCD.At optimal conditions, the laser heated spot is uniform over an〜40 micron diameter within ±50 K.The melting points of Fe, Pt, and Mo metals in the range of 〜1800-2900 K at 1 atmosphere have been reproduced to within 30 K.The melting point of W (3680) is reproduced within 80 K when a correction for wavelength dependent emissivity is made. The melting curve of Pt from〜3-12 GPa in the DAC has been reprodused to within about 40 K of previous work. The melting curve of Fe has been determined to 30 GPa, and is consistent within ±70 K of previous determinations made in large volume appparatus and in the laser-heated DAC.
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