High-Pressure Phase Transformations in Hexagonal and Amorphous Selenium

• D. R. McCann

  Marquette University, Milwaukee, Wisconsin 53233

• L. Cartz

  Marquette University, Milwaukee, Wisconsin 53233

抄録

Hexagonal selenium transforms to a new phase at 140 ± 10 kbar. The c/a ratio of 1.42 at the transformation corresponds to the same c/a ratio for tellurium at its transformation at 40 kbar. It has not been possible to decide unambiguously a unit cell from the diffraction pattern of the new phase. The high-pressure phase is irreversible being retained upon releasing the pressure. Amorphous Se slowly transforms to the crystalline state under pressure and eventually develops the same unknown high-pressure structure as the hexagonal form. The pressure-cycled amorphous material retains its crystalline structure upon releasing the pressure. This structure appears to be identical to the irreversible hexagonal phase. It is thought that the high-pressure structure is superconducting.

収録刊行物

• The Journal of Chemical Physics

  The Journal of Chemical Physics 56 (6), 2552-2554, 1972-03-15

  AIP Publishing

キーワード

• Physical and Theoretical Chemistry
• General Physics and Astronomy

詳細情報

• CRID: 1362544421348979584
• NII論文ID: 30015699484
• DOI: 10.1063/1.1677579
• ISSN: 10897690
• ISSN: 00219606
• Web Site: https://pubs.aip.org/aip/jcp/article-pdf/56/6/2552/18878750/2552_1_online.pdf
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