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Structural and Optical Properties of Cd1-xCoxGa₂Se₄ (0.0 ≤ x ≤ 1.0) Mixed Crystals

Vol.28 No.2, 2019.3, 24-29 (6 pages)
DOI :10.5757/ASCT.2019.28.2.24
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Abstract
The structural and optical properties of Cd1-xCoxGa₂Se₄ mixed crystals were investigated in the range 0.0 ≤ x ≤ 1.0 by measuring the X-ray diffraction and optical absorption. The X-ray diffraction analysis demonstrated that Cd1-xCoxGa₂Se₄ crystalized into a tetragonal structure for 0.0 ≤ x ≤ 1.0. The tetragonal lattice constants were a = 5.744 Å and c = 10.784 Å for CdGa₂Se₄ (x = 0.0), and a = 5.611 Å and c = 10.913 Å for CoGa₂Se₄ (x = 1.0), which are the end members of the Cd1-xCoxGa₂Se₄ system, exhibiting a composition dependence that varied linearly with composition x. The tetragonal structural properties of Cd1-xCoxGa₂Se₄ were investigated by taking into account the compositional dependence of the tetragonal distortion, 2-(c/a), and bonding distances RCd(Co)-Se and RGa-Se. The optical absorption spectra exhibited triplet absorption bands in the range 650 - 900 nm corresponding to the ⁴A2(⁴F) → ⁴ T₁(⁴P) transition of the Co2+ ions with Td symmetry sites, and a broad band in the range 1100 - 2200 nm corresponding to the ⁴A₂(⁴F) → ⁴T₁(⁴F) transition, for all investigated compositions. The composition dependencies of the crystal-field parameter, Dq, and Racah parameter, B, are discussed on the basis of a tetrahedral crystal-field approximation and composition dependent tetragonal structure.

TOC
Abstract
I. Introduction
II. Experimental details
III. Results and discussion
IV. Conclusions
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