Raman scattering in liquid k-te

J. Fortner; M. L. Saboungi

doi:10.1209/0295-5075/22/5/007

Raman scattering in liquid k-te

J. Fortner, M. L. Saboungi

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Abstract

Raman-scattering measurements from crystalline and liquid K_0.12Te_0.88and Ko_0.50Te_0.50semiconducting alloys are reported. The spectra of liquid K_0.12Te_0.88are characterized by a single, weakly polarized band, markedly different from those obtained from pure liquid Te and bearing agreater similarity to the spectra reported for amorphous Te. The spectra of K_0.50Te_0.50in thecrystalline and liquid phases show remarkable similarities, confirming the presence of the Te₂²Zintl ion in both phases. Substantial softening of the symmetric stretching mode occurs relativeto the equivalent mode in vapor and matrix-isolated Te₂. This is most likely due to the chargetransfer interaction with the matrix. A comparison of structimal data available for liquid andamorphous Te with those for liquid K_0.12Te_0.88and K_0.50Te_0.50indicates a transition to true 2-foldchainlike covalent bonding of Te in the liquid on addition of potassium. The importance of 2-foldbonding for the semiconducting behavior of Te-rich alloy systems in the liquid and solid states isdiscussed.

Original language	English
Pages (from-to)	359-364
Number of pages	6
Journal	EPL
Volume	22
Issue number	5
DOIs	https://doi.org/10.1209/0295-5075/22/5/007
State	Published - May 10 1993
Externally published	Yes

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title = "Raman scattering in liquid k-te",

abstract = "Raman-scattering measurements from crystalline and liquid K0.12Te0.88and Ko0.50Te0.50semiconducting alloys are reported. The spectra of liquid K0.12Te0.88are characterized by a single, weakly polarized band, markedly different from those obtained from pure liquid Te and bearing agreater similarity to the spectra reported for amorphous Te. The spectra of K0.50Te0.50in thecrystalline and liquid phases show remarkable similarities, confirming the presence of the Te22Zintl ion in both phases. Substantial softening of the symmetric stretching mode occurs relativeto the equivalent mode in vapor and matrix-isolated Te2. This is most likely due to the chargetransfer interaction with the matrix. A comparison of structimal data available for liquid andamorphous Te with those for liquid K0.12Te0.88and K0.50Te0.50indicates a transition to true 2-foldchainlike covalent bonding of Te in the liquid on addition of potassium. The importance of 2-foldbonding for the semiconducting behavior of Te-rich alloy systems in the liquid and solid states isdiscussed.",

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T1 - Raman scattering in liquid k-te

AU - Fortner, J.

AU - Saboungi, M. L.

PY - 1993/5/10

Y1 - 1993/5/10

N2 - Raman-scattering measurements from crystalline and liquid K0.12Te0.88and Ko0.50Te0.50semiconducting alloys are reported. The spectra of liquid K0.12Te0.88are characterized by a single, weakly polarized band, markedly different from those obtained from pure liquid Te and bearing agreater similarity to the spectra reported for amorphous Te. The spectra of K0.50Te0.50in thecrystalline and liquid phases show remarkable similarities, confirming the presence of the Te22Zintl ion in both phases. Substantial softening of the symmetric stretching mode occurs relativeto the equivalent mode in vapor and matrix-isolated Te2. This is most likely due to the chargetransfer interaction with the matrix. A comparison of structimal data available for liquid andamorphous Te with those for liquid K0.12Te0.88and K0.50Te0.50indicates a transition to true 2-foldchainlike covalent bonding of Te in the liquid on addition of potassium. The importance of 2-foldbonding for the semiconducting behavior of Te-rich alloy systems in the liquid and solid states isdiscussed.

AB - Raman-scattering measurements from crystalline and liquid K0.12Te0.88and Ko0.50Te0.50semiconducting alloys are reported. The spectra of liquid K0.12Te0.88are characterized by a single, weakly polarized band, markedly different from those obtained from pure liquid Te and bearing agreater similarity to the spectra reported for amorphous Te. The spectra of K0.50Te0.50in thecrystalline and liquid phases show remarkable similarities, confirming the presence of the Te22Zintl ion in both phases. Substantial softening of the symmetric stretching mode occurs relativeto the equivalent mode in vapor and matrix-isolated Te2. This is most likely due to the chargetransfer interaction with the matrix. A comparison of structimal data available for liquid andamorphous Te with those for liquid K0.12Te0.88and K0.50Te0.50indicates a transition to true 2-foldchainlike covalent bonding of Te in the liquid on addition of potassium. The importance of 2-foldbonding for the semiconducting behavior of Te-rich alloy systems in the liquid and solid states isdiscussed.

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Raman scattering in liquid k-te

Abstract

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