High-temperature calibration of a multi-anvil high pressure apparatus |
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Authors: | Alexander G Sokol Yury M Borzdov Yury N Palyanov Alexander F Khokhryakov |
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Institution: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, ave. Koptyuga 3, Novosibirsk 630090 Russia;2. Novosibirsk State University, str. Pirogova 2, Novosibirsk, 630090 Russia |
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Abstract: | Fusion and solidification of Al and Ag samples, as well as Fe93–Al3–C4, Fe56–Co37–Al3–C4, and Fe57.5–Co38–Al1–Pb0.5–C3 alloys (in wt%), have been investigated at 6.3?GPa. Heater power jumps due to heat consumption and release on metal fusion and solidification, respectively, were used to calibrate the thermal electromotive force of the thermocouple against the melting points (mp) for Ag and Al. Thus, obtained corrections are +100°C (for sample periphery) and +65°C (center) within the 1070–1320°C range. For small samples positioned randomly in the low-gradient zone of a high pressure cell, the corrections should be +80°C and +84°C at the temperatures 1070°C and 1320°C, respectively. The temperature contrast recorded in the low-gradient cell zone gives an error about ±17°C. The method has been applied to identify the mp of the systems, which is especially important for temperature-gradient growth of large type IIa synthetic diamonds. |
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Keywords: | HPHT experiment multi-anvil apparatus high pressure diamond synthesis temperature measurements |
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