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Title: Raman scattering in single-crystal sapphire at elevated temperatures

Abstract

Sapphire is a widely used high-temperature material and this work presents thorough characterization of all the measurable Raman scattering modes in sapphire and their temperature dependencies. Here, Raman scattering in bulk sapphire rods is measured from room temperature to 1081 °C and is illustrated as a method of noncontact temperature measurement. A single-line argon ion laser at 488 nm was used to excite the sapphire rods inside a cylindrical furnace. All the anti-Stokes peaks (or lines) were observable through the entire temperature range of interest, while Stokes peaks were observable until they were obscured by background thermal emission. Temperature measurements were found to be most reliable for A1g and Eg modes using the peaks at ±418, ±379, +578, +645, and, +750 cm-1 (+ and – are designated for Stokes and anti-Stokes peaks respectively). The 418 cm-1 peak was found to be the most intense peak. The temperature dependence of peak position, peak width, and peak area of the ±418 and ±379 peaks is presented. For +578, +645 and +750, the temperature dependence of peak position is presented. The peaks’ spectral positions provide the most precise temperature information within the experimental temperature range. Finally, the resultant temperature calibration curves are given,more » which indicate that sapphire can be used in high-temperature Raman thermometry with an accuracy of about 1.38°C average standard deviation over the entire >1000°C temperature range.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1406891
Alternate Identifier(s):
OSTI ID: 1402536
Report Number(s):
NETL-PUB-21268
Journal ID: ISSN 1559-128X; APOPAI
Grant/Contract Number:  
FWP#1022408; FWP#1022427
Resource Type:
Accepted Manuscript
Journal Name:
Applied Optics
Additional Journal Information:
Journal Volume: 56; Journal Issue: 31; Journal ID: ISSN 1559-128X
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 47 OTHER INSTRUMENTATION; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Raman spectroscopy; temperature measurement; sapphire; aluminum oxide

Citation Formats

Thapa, Juddha, Liu, Bo, Woodruff, Steven D., Chorpening, Benjamin T., and Buric, Michael P. Raman scattering in single-crystal sapphire at elevated temperatures. United States: N. p., 2017. Web. doi:10.1364/AO.56.008598.
Thapa, Juddha, Liu, Bo, Woodruff, Steven D., Chorpening, Benjamin T., & Buric, Michael P. Raman scattering in single-crystal sapphire at elevated temperatures. United States. doi:10.1364/AO.56.008598.
Thapa, Juddha, Liu, Bo, Woodruff, Steven D., Chorpening, Benjamin T., and Buric, Michael P. Wed . "Raman scattering in single-crystal sapphire at elevated temperatures". United States. doi:10.1364/AO.56.008598. https://www.osti.gov/servlets/purl/1406891.
@article{osti_1406891,
title = {Raman scattering in single-crystal sapphire at elevated temperatures},
author = {Thapa, Juddha and Liu, Bo and Woodruff, Steven D. and Chorpening, Benjamin T. and Buric, Michael P.},
abstractNote = {Sapphire is a widely used high-temperature material and this work presents thorough characterization of all the measurable Raman scattering modes in sapphire and their temperature dependencies. Here, Raman scattering in bulk sapphire rods is measured from room temperature to 1081 °C and is illustrated as a method of noncontact temperature measurement. A single-line argon ion laser at 488 nm was used to excite the sapphire rods inside a cylindrical furnace. All the anti-Stokes peaks (or lines) were observable through the entire temperature range of interest, while Stokes peaks were observable until they were obscured by background thermal emission. Temperature measurements were found to be most reliable for A1g and Eg modes using the peaks at ±418, ±379, +578, +645, and, +750 cm-1 (+ and – are designated for Stokes and anti-Stokes peaks respectively). The 418 cm-1 peak was found to be the most intense peak. The temperature dependence of peak position, peak width, and peak area of the ±418 and ±379 peaks is presented. For +578, +645 and +750, the temperature dependence of peak position is presented. The peaks’ spectral positions provide the most precise temperature information within the experimental temperature range. Finally, the resultant temperature calibration curves are given, which indicate that sapphire can be used in high-temperature Raman thermometry with an accuracy of about 1.38°C average standard deviation over the entire >1000°C temperature range.},
doi = {10.1364/AO.56.008598},
journal = {Applied Optics},
number = 31,
volume = 56,
place = {United States},
year = {2017},
month = {10}
}

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