The Thermal Analysis in a MA-8 Type Apparatus: The Melting of Gold at 12 GPa

T. Sumita; M. Kato; A. Yoneda

doi:10.4131/jshpreview.7.254

The Thermal Analysis in a MA-8 Type Apparatus: The Melting of Gold at 12 GPa

T. Sumita, M. Kato, A. Yoneda

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

High pressure thermal analysis and differential thermal analysis have been developed for detecting phase transitions in an MA-8 type apparatus. By using these methods, the melting and freezing of gold was investigated at 12 GPa. We observed the latent heat signal of gold both on melting and freezing processes, and determined the melting temperature at 1868±10 K. This temperature is lower by about 60 K than the extrapolation of the previous experiments by using the Kraut-Kennedy equation. We interpreted this discrepancy to be due to the pressure effect on the emf of the W-3%Re/W-25%Re thermocouple.

Original language	English
Pages (from-to)	254-256
Number of pages	3
Journal	Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume	7
DOIs	https://doi.org/10.4131/jshpreview.7.254
Publication status	Published - 1998

Keywords

gold
high pressure
phase transition
pressure effect on the thermocouple emf
thermal analysis

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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abstract = "High pressure thermal analysis and differential thermal analysis have been developed for detecting phase transitions in an MA-8 type apparatus. By using these methods, the melting and freezing of gold was investigated at 12 GPa. We observed the latent heat signal of gold both on melting and freezing processes, and determined the melting temperature at 1868±10 K. This temperature is lower by about 60 K than the extrapolation of the previous experiments by using the Kraut-Kennedy equation. We interpreted this discrepancy to be due to the pressure effect on the emf of the W-3%Re/W-25%Re thermocouple.",

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AU - Yoneda, A.

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AB - High pressure thermal analysis and differential thermal analysis have been developed for detecting phase transitions in an MA-8 type apparatus. By using these methods, the melting and freezing of gold was investigated at 12 GPa. We observed the latent heat signal of gold both on melting and freezing processes, and determined the melting temperature at 1868±10 K. This temperature is lower by about 60 K than the extrapolation of the previous experiments by using the Kraut-Kennedy equation. We interpreted this discrepancy to be due to the pressure effect on the emf of the W-3%Re/W-25%Re thermocouple.

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KW - pressure effect on the thermocouple emf

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