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- W1675049163 startingPage "10672" @default.
- W1675049163 abstract "Single crystals of ${mathrm{Zn}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Cd}}_{mathit{x}}$${mathrm{Ga}}_{2}$${mathrm{Se}}_{4}$ and ${mathrm{Zn}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Cd}}_{mathit{x}}$${mathrm{Ga}}_{2}$${mathrm{Se}}_{4}$:${mathrm{Co}}^{2+}$ were grown by a chemical-transport reaction method using the ingots synthesized with 3 at. % excess of selenium as starting materials. It has been found that these single crystals have a defect chalcopyrite structure, and the tetragonal distortion factor (2-c/a) decreases due to the introduction of an excess of selenium. It has also been shown that these compounds have a direct optical-energy gap, and the direct optical-energy gap decreases when a composition X increases and when a cobalt impurity is introduced. The temperature dependence of the optical-energy gap is well given by the Varshni equation. Impurity optical absorption of the ${mathrm{Zn}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Cd}}_{mathit{x}}$${mathrm{Ga}}_{2}$${mathrm{Se}}_{4}$:${mathrm{Co}}^{2+}$ single crystals has been investigated in the temperatures 289 and 80 K and in the wavelength region 250--2500 nm. It is concluded that a cobalt atom in the ${mathrm{Zn}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Cd}}_{mathit{x}}$${mathrm{Ga}}_{2}$${mathrm{Se}}_{4}$:${mathrm{Co}}^{2+}$ single crystals with a small tetragonal distortion occupies nearly a cubic ${mathit{T}}_{mathit{d}}$ symmetry site of the host lattice as a ${mathrm{Co}}^{2+}$ ion; then the observed impurity optical-absorption peaks are attributed to the electronic transition between the energy levels of a ${mathrm{Co}}^{2+}$ ion in a crystal field of a cubic ${mathit{T}}_{mathit{d}}$ symmetry." @default.
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- W1675049163 date "1994-10-15" @default.
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- W1675049163 title "Structural and optical properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Zn</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cd</mml:mi></mml:mrow><…" @default.
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- W1675049163 doi "https://doi.org/10.1103/physrevb.50.10672" @default.
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