High-temperature calibration of a multi-anvil high pressure apparatus

Alexander G. Sokol, Yury M. Borzdov, Yury N. Palyanov, Alexander F. Khokhryakov

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)139-147
Number of pages9
JournalHigh Pressure Research
Volume35
Issue number2
DOIs
Publication statusPublished - 3 Apr 2015

Keywords

  • high pressure diamond synthesis
  • HPHT experiment
  • multi-anvil apparatus
  • temperature measurements

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