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The color enhancement of natural ruby produced from Mong Hsu
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Mong Hsu산 천연루비의 색상 개선

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Type
Academic journal
Author
Journal
한국결정성장학회 한국결정성장학회지 한국결정성장학회지 제14권 제6호 KCI Accredited Journals
Published
2004.1
Pages
290 - 297 (8page)

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The color enhancement of natural ruby produced from Mong Hsu
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The color enhancement of natural ruby produced from Mong Hsu were carried out by the heat treatment using gas diffusion. The natural ruby in this paper has a colored patch of which the color ranges from blue to a color close to black. The most favorable heat treatment conditions were as follows; range of temperature 1400~1600oC, duration 12 hrs, O2 atmosphere . The color tone of ruby obtained under the optimum conditions was overall clear red by partial removal of colored patch. From EPMA results, part of blue or black colored patch within ruby were found to occur by charge transfer between Fe2+ and Ti4+. These results are consistent with the XRF that contents of Fe(Fe2+ or Fe3+) and Ti4+ ion to cause a blue or black colored patch after heat treatment became slightly less than with non-treated ruby. The silk formed on the surface of ruby heat treated for 12 hrs at 1700oC were found to be generated by re-crystallization of rutile TiO2 by XPS analysis.
#Mong Hsu #Natural ruby #Colored patch #Color enhancement #Silk

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References (6)

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E. Fritsch / 1998 / Separating natural and synthetic rubies on the basis of trade-element chemistry 34 : 80 ~ google schola P. Winotai, / 2001 / Optimization of heat treatments of African green sapphires : 873 ~ google schola [ 3 ]R.C. Linares / 19651817. / ？Properties and growth of flux ruby google schola [ 5 ]K. Nassau / 1990 / ？Synthetic gem materials in the 1980s : 64 ~ google schola [ 8 ]J. Ferguson / 1971 / ？The origin of the colors of yellow : 262 ~ google schola

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