Effect of isomorphic atom substitution on the lattice parameters and the optical absorption edge of TlGaSe2-TlInSe2 mixed crystals


Gasanly N. M.

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, cilt.48, sa.5, ss.914-918, 2006 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 48 Konu: 5
  • Basım Tarihi: 2006
  • Dergi Adı: JOURNAL OF THE KOREAN PHYSICAL SOCIETY
  • Sayfa Sayıları: ss.914-918

Özet

The variation of lattice parameters of TlGaSe2-TlInSe2 mixed crystals with composition have been investigated by using of X-ray diffraction technique. For the mixed crystals studied, a structural phase transition (monoclinic to tetragonal) due to atom substitution is observed when the sum of the tetrahedral covalent radii of the Ga(In) and the Se atoms in Ga(In)Se-4 tetrahedra reaches a critical value of about 0.254 nm. From transmission and reflection measurements, the compositional dependence of the indirect energy band gap was revealed.