Raman and absorption spectroscopy of InP under high pressure
| Autor: | S J Webb, M F Whitaker, David J. Dunstan |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Phase transition
Range (particle radiation) Work (thermodynamics) Absorption spectroscopy Chemistry Band gap Analytical chemistry Condensed Matter Physics Molecular physics Condensed Matter::Materials Science symbols.namesake Transverse plane symbols General Materials Science Absorption (electromagnetic radiation) Raman spectroscopy |
| Zdroj: | Journal of Physics: Condensed Matter. 10:8611-8618 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/10/38/019 |
| Popis: | Raman and absorption measurements on three samples of InP are measured in a diamond-anvil cell at room temperature for pressures up to the phase transition. This occurs progressively between 90 and 99 kbar for all three samples, with a highest band-gap energy of 2.01 eV. The results from this work are compared with previous results in the literature. Correlation of the maximum shift of the Raman signal and of the band gap with the phase transition pressure are used to distinguish real differences from experimental error. In this way the phase transition pressure is found to range from 90 kbar to more than 105 kbar. We find consistent pressure coefficients for the band gap energy of , for the longitudinal optical (LO) phonon energy of and for the transverse optical (TO) of . The mode-specific Gruneisen parameters are and . |
| Databáze: | OpenAIRE |
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