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Raman scattering in single-crystal sapphire at elevated temperatures.
Applied Optics
|November 2, 2017
Summary
This study characterizes sapphire
Area of Science:
- Materials Science
- Spectroscopy
- Thermodynamics
Background:
- Sapphire is a critical high-temperature material.
- Accurate noncontact temperature measurement is essential for industrial processes.
Purpose of the Study:
- To thoroughly characterize Raman scattering modes in sapphire and their temperature dependencies.
- To establish sapphire as a reliable material for high-temperature Raman thermometry.
Main Methods:
- Raman scattering measurements were performed on bulk sapphire rods from room temperature to 1081°C.
- A 488 nm argon ion laser was used for excitation within a cylindrical furnace.
- Temperature dependencies of peak position, width, and area for specific Raman modes were analyzed.
Main Results:
- Anti-Stokes peaks were observable across the entire temperature range.
- Stokes peaks were visible until obscured by thermal emission.
- Specific Raman modes (A1g and Eg) showed reliable temperature-dependent behavior, with the 418 cm-1 peak being the most intense.
Conclusions:
- Sapphire's spectral peak positions offer precise temperature information.
- Sapphire can be utilized for high-temperature Raman thermometry with an average standard deviation of 1.38°C over a >1000°C range.
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