Semiconductor diamond heater in the Kawai multianvil apparatus: An innovation to generate the lower mantle geotherm

Akira Yoneda, Longjian Xie, Noriyoshi Tsujino, Eiji Ito

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Semiconductor diamond is considered the best heater material to generate ultra-high temperatures in a Kawai cell. In two pioneering studies, a mixture of graphite and amorphous boron (or boron carbide, B4C) was converted to semiconductor diamond in the diamond stability field and was confirmed to generate 2000°C and 3500°C, respectively. Following these works, we synthesized a homemade boron-doped graphite block with fine machinability. With this technical breakthrough, we developed a semiconductor diamond heater in a smaller Kawai-type cell assembly. Here, we report the procedure for making machinable boron-doped graphite, and the performance of the material as a heater in a Kawai cell at 15GPa using tungsten carbide anvils and at ∼50GPa using sintered diamond anvils. Furthermore, we present a finite element simulation of the temperature distribution generated by a semiconductor diamond heater, which is much more homogeneous than that generated by a metal heater.

Original languageEnglish
Pages (from-to)392-403
Number of pages12
JournalHigh Pressure Research
Volume34
Issue number4
DOIs
Publication statusPublished - Oct 2 2014

Keywords

  • Kawai cell
  • boron-doped diamond
  • finite element method

ASJC Scopus subject areas

  • Condensed Matter Physics

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