Phase relations in boron at pressures up to 18 GPa and temperatures up to 2200 °c

Jiaqian Qin, Tetsuo Irifune, Haruhiko Dekura, Hiroaki Ohfuji, Norimasa Nishiyama, Li Lei, Toru Shinmei

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27 Citations (Scopus)


The phase relations in boron have been investigated at high pressure and high temperature using a multianvil apparatus, and the quenched sample has been analyzed by x-ray diffraction, Raman spectra, and transmission electron microscopy. We demonstrate that γ-B 28 can be synthesized over a wide pressure and temperature range, and α-tetragonal B 50 (T-B 50) is obtained at higher temperatures and similar pressures. The phase boundary of the β-B 106, γ-B 28, and T-B 50 is determined at pressures between 7.0 and 18 GPa and the temperatures of 500-2200 C. The results suggest that T-B 50 might be an intermediate phase formed for kinetic reasons (Ostwald rule) on the way from β-B 106 to β-tetragonal B 192 (T-192) and γ-B 28 to T-192.

Original languageEnglish
Article number014107
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2012 Jan 17
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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