- Full text:
- PDF (eReader) / PDF (Download) (286 kB)
Pressure-induced phase transitions of trigonal, rhombohedral, orthorhombic, and α-monoclinic selenium (Se), which consist of 3 1 helical chain, Se 6 , Se 7 , and Se 8 ring molecules, respectively, have been re-examined by an X-ray diffraction method. All allotropes transform to Se-IV (incommensurate monoclinic form) at about 30 GPa through a mixture phase of Se-II (monoclinic form, puckered layer structure) and Se-II' (tetragonal form consisting of 4 1 and 4 3 helical chain molecules). The ratio of Se-II to Se-II' in the mixture phase increases with the increase in density of starting material. Trigonal form (Se-I) transforms to Se-I', which is isostructural with Se-I, at 3 GPa, where an intramolecular covalent bond length decreases abruptly by about 0.8%.
References
- 1 P.Grosse and G.Weiser: in Landolt-Börnstein, ed. O.Madelung, M.Schulz, and H.Weiss (Springer, Berlin, 1983) Vol. 17e, p. 65. Google Scholar
- 2 Y.Ohmasa, I.Yamamoto, M.Yao, and H.Endo: J. Phys. Soc. Jpn. 64 (1995) 4766. Link, Google Scholar
- 3 C.Hejny and M. I.McMahon: Phys. Rev. B 70 (2004) 184109. Crossref, Google Scholar
- 4 M. I.McMahon, C.Hejny, J. S.Loveday, and L. F.Lundegaard: Phys. Rev. B 70 (2004) 054101. Crossref, Google Scholar
- 5 O.Degtyareva, E.Gregoryanz, M.Somayazulu, H. K.Mao, and R. J.Hemley: Phys. Rev. B 71 (2005) 214104. Crossref, Google Scholar
- 6 Y.Akahama, M.Kobayashi, and H.Kawamura: Phys. Rev. B 47 (1993) 20. Crossref, Google Scholar
- 7 H.Kawamura, N.Matsui, I.Nakahata, K.Nakano, M.Kobayashi, Y.Akahama, K.Nagata, and Y.Miyamoto: Solid State Commun. 108 (1998) 677. Crossref, Google Scholar
- 8 K.Nakano, Y.Akahama, H.Kawamura, M.Takumi, and K.Nagata: Phys. Status Solidi B 223 (2001) 397. Crossref, Google Scholar
- 9 Y.Akahama, M.Kobayashi, and H.Kawamura: Phys. Rev. B 56 (1997) 5027. Crossref, Google Scholar
- 10 H.Fujihisa, Y.Akahama, H.Kawamura, H.Yamawaki, M.Sakashita, T.Yamada, K.Honda, and T. L.Bihan: Phys. Rev. B 70 (2004) 134106. Crossref, Google Scholar
- 11 Y.Miyamoto: Jpn. J. Appl. Phys. 16 (1977) 2257. Crossref, Google Scholar
- 12 H. K.Mao, P. M.Bell, J. W.Shaner, and D. J.Steinberg: J. Appl. Phys. 49 (1978) 3276. Crossref, Google Scholar
- 13 Y.-I.Kim and F.Izumi: J. Ceram. Soc. Jpn. 102 (1994) 401. Crossref, Google Scholar
- 14 R.Keller, W. B.Holzapfel, and H.Schulz: Phys. Rev. B 16 (1977) 4404. Crossref, Google Scholar
- 15 K.Nagata, Y.Miyamoto, H.Nishimura, H.Suzuki, and S.Yamasaki: Jpn. J. Appl. Phys. 24 (1985) L858. Crossref, Google Scholar