Condensed Matter Physics, 2007, vol. 10, No. 1 (49), p. 39-43, English
DOI:10.5488/CMP.10.1.39

Title: The band energy structure of RbKSO4 crystals
Author(s):
  O.V.Bovgyra (Franko Lviv National University, Kyrylo and Mefodij, 8str., Lviv, 79005 Ukraine) ,
  V.Yo.Stadnyk (Franko Lviv National University, Kyrylo and Mefodij, 8str., Lviv, 79005 Ukraine) ,
  A.V.Franiv (Franko Lviv National University, Kyrylo and Mefodij, 8str., Lviv, 79005 Ukraine) ,
  M.R.Tuzyak (Franko Lviv National University, Kyrylo and Mefodij, 8str., Lviv, 79005 Ukraine) ,
  O.Z.Chyzh (Franko Lviv National University, Kyrylo and Mefodij, 8str., Lviv, 79005 Ukraine)

The energy band structure of mechanically free and compressed RbKSO4 single crystals is investigated. It is established that the top of the valence band is located at the D point of the Brillouin zone [k = (0.5, 0.5, 0)], the bottom of the conduction band lies at the Γ point, and the minimum direct band gap Eg is equal to 5.80 eV. The bottom of the conduction band is predominantly formed by the K s, Li p, Rb s, and Rb p states hybridized with the S p and O p antibonding states. The pressure coefficients of the energy position of the valence and conduction band states and the band gap Eg are determined.

Key words: uniaxial pressure, energy band, structure, valence band, conduction band
PACS: 71.20.Ps, 78.20.Ci


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