Raman scattering in liquid K-Te.
Raman-scattering measurements from crystalline and liquid K{sub 0.12}Te{sub 0.88} and K{sub 0.50}Te{sub 0.50} semiconducting alloys are reported. The spectra of liquid K{sub 0.12}Te{sub 0.88} are characterized by a single, weakly polarized band, markedly different from those obtained from pure liquid Te and bearing a greater similarity to the spectra reported for amorphous Te. The spectra of K{sub 0.50}Te{sub 0.50} in the crystalline and liquid phases show remarkable similarities, confirming the presence of the Te{sub 2}{sup 2-} Zintl ion in both phases. Substantial softening of the symmetric stretching mode occurs relative to the equivalent mode in vapor and matrix-isolated Te{sub 2}. This is most likely due to the charge transfer interaction with the K{sup +} matrix. A comparison of structural data available for liquid and amorphous Te with those for liquid K{sub 0.12}Te{sub 0.88} and K{sub 0.50}Te{sub 0.50} indicates a transition to true 2-fold chainlike covalent bonding of Te in the liquid on addition of potassium. The importance of 2-fold bonding for the semiconducting behavior of Te-rich alloy systems in the liquid and solid states is discussed.
- Research Organization:
- Argonne National Laboratory (ANL)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937663
- Report Number(s):
- ANL/MSD/JA-7901
- Journal Information:
- Europhy. Lett., Journal Name: Europhy. Lett. Journal Issue: 5 ; 1993 Vol. 22; ISSN 0295-5075; ISSN EULEEJ
- Country of Publication:
- United States
- Language:
- ENGLISH
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