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자료유형
학술저널
저자정보
Chang-Dae Kim (Mokpo National University)
저널정보
한국진공학회(ASCT) Applied Science and Convergence Technology Applied Science and Convergence Technology Vol.28 No.2
발행연도
2019.3
수록면
24 - 29 (6page)
DOI
10.5757/ASCT.2019.28.2.24

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초록· 키워드

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The structural and optical properties of Cd<SUB>1-x</SUB>Co<SUB>x</SUB>Ga₂Se₄ 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 Cd<SUB>1-x</SUB>Co<SUB>x</SUB>Ga₂Se₄ 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 Cd<SUB>1-x</SUB>CoxGa₂Se₄ system, exhibiting a composition dependence that varied linearly with composition x. The tetragonal structural properties of Cd<SUB>1-x</SUB>CoxGa₂Se₄ were investigated by taking into account the compositional dependence of the tetragonal distortion, 2-(c/a), and bonding distances R<SUB>Cd(Co)-Se</SUB> and R<SUB>Ga-Se</SUB>. 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 Co<SUP>2+</SUP> ions with T<SUB>d</SUB> 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.

목차

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

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UCI(KEPA) : I410-ECN-0101-2019-420-001277384