The Color Change of Natural Blue Sapphires by Heat Treatment

Authors

  • Treedej Kittiauchawal Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand.
  • Pichet Limsuwan Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand.

Keywords:

blue sapphires, heat treatment

Abstract

This research aimed to investigate the effects of heat treatment on color and clarity of blue sapphires. The blue sapphires were heated at sequentilly increasing temperature of 1300, 1400, 1500 and 1600 °C in nitrogen atmosphere. Each temperature, the samples were treated for 12 hours, before and after heat treatment at each temperatures, the color and clarity were measured by spectrophotometer. It was found that, when blue sapphires were heated at high temperatures, the color of the untreated sapphire crystal changed to darker blue at higher temperatures. Whereas, the clarity of all samples were not significantly found in the temperature range of 1300 -1600°C .

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Published

2007-12-31

How to Cite

Treedej Kittiauchawal, and Pichet Limsuwan. 2007. “The Color Change of Natural Blue Sapphires by Heat Treatment”. Agriculture and Natural Resources 41 (5). Bangkok, Thailand:262-66. https://li01.tci-thaijo.org/index.php/anres/article/view/244378.

Issue

Vol. 41 No. 5 (2007): January-December

Section

Research Article

License

online 2452-316X print 2468-1458/Copyright © 2022. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/),
production and hosting by Kasetsart University of Research and Development Institute on behalf of Kasetsart University.