Micro-structural defects in ruby samples from Mong Hsu, Myanmar

P. Maneeratanasarn; P. Wathanakul; 김영출; 최현민; 방신영; 최봉근; 심광보

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자료유형: 학술저널

저자정보: P. Maneeratanasarn P. Wathanakul 김영출 최현민 방신영 최봉근 심광보

저널정보: 한국결정성장학회 한국결정성장학회지 한국결정성장학회지 제19권 제2호

발행연도: 2009.1

수록면: 90 - 94 (5page)

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Mong Hsu rubies from Myanmar were heat treated in oxidizing (oxygen) atmosphere at 1650oC for 1 hour. The investigations of the micro-structural defects in the samples before and after heat treatment have been carried out by the variety of analysis techniques of FTIR, UV-VIS-NIR and SEM-EDS. It was found that after heat treatment the dark blue cores region were disappeared and turned to orange red color with the presence of the dense cloudy brownish colored tiny particles in and near former blue zoning. As-received ruby samples only revealed the presence of FTIR absorption peaks of diaspore, boehmite and O-H stretching, at 1986, 2115 and 3078/3319 cm−1 , respectively. The UV-VIS-NIR absorption of asreceived and heat treated ruby samples similarly showed peaks at 405, 554 and 693 nm associated with Cr3+, but for the same samples, the absorption peak of heat-treated ruby samples at 693 nm was somewhat stronger than that of the untreated ruby samples. Especially the presence of Cr3+ peaks at 659 and 675 nm was found obviously in as-received ruby samples only. The SEM-EDS investigation disclosed the micro-porous defect structures commonly related to the core regions of the untreated ruby samples, which after heat treatment in an oxidizing environment those defect features have been dissolved into the host phase resulting in the lightening or disappearance of the dark coloration of ruby core.

#Ruby #Heat treatment #SEM-EDS

참고문헌 (8)

참고문헌 신청

A. Peretti / 1995 / Rubies from Mong Hsu / Gems & Gemology 31 (1) : 2 ~

J.L. Sanchez / 1997 / Micro-PIXE analysis of trace element concentrations of natural rubies from different locations in Myanmar / Nucl Instr and Meths. B130 : 682 ~

K. Nassau / 2001 / The physics and chemistry of color: The fifteen causes of color / John Wiley and Sons : 317 ~

R.W. Hughes / 1997 / Ruby & Sapphire / RWH Publishing : 60 ~

S. Achiwawanich / 2006 / XPS and ToF-SIMS analysis of natural rubies and sapphires heated in an inert (N2) atmosphere / Appl. Surf. Sci. 252 : 8646 ~

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