A new thermal analysis technique for detecting the melting of silicates under high pressure: Application to the melting of pyrope up to 9 GPa

Tatsuya Sumita, Akira Yoneda

Research output: Contribution to journalArticlepeer-review

Abstract

A new thermal analysis for the Kawai-type high-pressure apparatus has been developed for determining the melting temperatures of silicates. The thermal analysis system consists of a heating system and a temperature measurement system: the former enables us to control heating and cooling accurately through a personal computer, and the latter measures the highest and lowest temperatures of the sample precisely with two independent thermocouples. The signal of melting is detected by monitoring dΔT/dt, where ΔT is the temperature difference across the sample, and t is time. The performance of this thermal analysis method has been tested by re-determining the melting curve of pyrope up to 9 GPa. The resulting melting curve agrees well with previous results determined by quenching experiments. Further, the proposed method improves the efficiency of determining the melting curve-it has taken only three runs to construct the curve, while previous quenching experiments required thirty runs to yield similar results.

Original languageEnglish
Pages (from-to)473-481
Number of pages9
JournalHigh Temperatures - High Pressures
Volume34
Issue number4
DOIs
Publication statusPublished - Dec 4 2002

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry

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