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Effect of isomorphic atom substitution on the lattice parameters and the optical absorption edge of TIGaSe2-TllnSe2 mixed crystals
Date
2006-05-01
Author
Hasanlı, Nızamı
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The variation of lattice parameters of TlGaSe2-TlInSe 2 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)Se4 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.
Subject Keywords
Mixed crystals
,
Optical absorption
,
X-ray diffraction
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33745001800&origin=inward
https://hdl.handle.net/11511/79005
Journal
Journal of the Korean Physical Society
Collections
Department of Physics, Article
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Effect of isomorphic atom substitution on the lattice parameters and the optical absorption edge of TlGaSe2-TlInSe2 mixed crystals
Gasanly, N. M. (2006-05-01)
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 indir...
Effect of isomorphic atom substitution on lattice parameters of TlBX2-type mixed crystals
Özkan, Hüsnü; Hasanlı, Nızamı; Çulfaz, Ali (1996-12-01)
The variation of the lattice parameters of TlBX2-type mixed crystals with composition have been investigated by X-ray diffraction technique. The lattice anisotropy (c/a) of the mixed crystals changes linearly depending on substitution of the atoms located both at the centre and at the vertices of the BX4 tetrahedra. For some of the mixed crystals studied, structural phase transition (monoclinic ⇌ tetragonal) is observed due to atom substitution when the sum of tetrahedral covalent radii of the B and X atoms...
Influence of isomorphic atom substitution on lattice anisotropy of thallium dichalcogenide layered mixed crystals
Hasanlı, Nızamı (2006-10-01)
Compositional variation of the lattice parameters of TlBX2-type (B = Ga or In and X = S or Se) mixed crystals with monoclinic structure were studied by X-ray diffraction technique. The lattice anisotropy (c/b) of these mixed crystals changes linearly with substitution of the atoms located both at the centers and the vertices of the corresponding BX4 tetrahedra. A brief survey of the important features of the effect of isomorphic atom substitution on the lattice anisotropy and the unit cell volume of TIBX2-t...
Effect of temperature and isomorphic atom substitution on optical absorption edge of TlInS2xSe2(1-x) mixed crystals (0.25 <= x <= 1)
Hasanlı, Nızamı (Wiley, 2010-05-01)
The optical properties of the TlInS2xSe2(1-x) mixed crystals (0.25 <= x <= 1) have been investigated through the transmission and reflection measurements in the wavelength range of 400-1100 nm. The optical indirect band gap energies were determined by means of the analysis of the absorption data. It was found that the energy band gaps decrease with the increase of selenium atoms content in the TlInS2xSe2(1-x) mixed crystals. The transmission measurements carried out in the temperature range of 10-300 K reve...
Composition dependence of lattice parameters and band gap energies of thallium based layered mixed crystals
Hasanlı, Nızamı (2015-07-01)
Compositional dependence of lattice parameters and unit cell volumes of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals with monoclinic structure has been studied by X-ray diffraction technique. It is revealed that the lattice parameters of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2 and TlIn(Se1-xSx)(2) mixed crystals increase due to the substitution of gallium atoms by indium and sulfur atoms by selenium. Moreover, the absorption edges of these mixed crystals have been investigated th...
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N. Hasanlı, “Effect of isomorphic atom substitution on the lattice parameters and the optical absorption edge of TIGaSe2-TllnSe2 mixed crystals,”
Journal of the Korean Physical Society
, pp. 914–918, 2006, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33745001800&origin=inward.
