靑色 사파이어의 熱處理와 分光學的 特性

• 영문명: Heat treatment and UV-spectral characteristics of blue sapphires from Shangtung, China
• 발행기관: 대한자원환경지질학회
• 저자명: 나경주(Kyung Ju Na) 김원사(Won Sa Kim) 김문영(Mun Young Kim) 배인국(In Kook Bae) 장영남(Young Nam Jang)
• 간행물 정보: 『자원환경지질』26권 1호, 107~114쪽, 전체 8쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1993.02.28

영문 초록

For the blue sapphires from Santung, China, the color change before and after has been investigated by UV-Visible spectrophotometry method. The blue sapphires from Shantung show four groups of absorption bands: the bands A (374, 386 and 450 nm) being attributed to single Fe³⁺ ion, the band B (560, 579 and 704 nm) to Fe²⁺/Ti⁴⁺ pairs, the band C (~800 nm) to Fe²⁺/Fe³⁺ pairs, and the D (528 nm) to Ti³⁺ d-d transitions. From those UV-VIS characteristics the origin of blue color of the sapphires is confirmed to be attributed by the factors such as Fe²⁺/Fe³⁺ and Ti³⁺/Ti⁴⁺. The absorption spectra of natural blue sapphires before and after heat treatment show distintive features, comparing with those of sapphires from other localities: the bands of 689 nm and of Cr³⁺ are not recorded on the spectra of sapphires from Shantung. The band (492 nm), which resulted from Ti³⁺, is not shown and the intensity of the band 528 nm decreases after the heat treatment. Decoloration of ink-blue sapphires are found to be successful by heat treatment with the control of annealing and atmosphere. During the diffusion process the excess components of impurities contained originally in the host crystal were expelled to the surface of crystals, enhancing the transparency of the crystals noticeably.

목차

ABSTRACT

서언

熱處理와 제반조건

紫外線-可視光線 分光分析

토론

결론

참고문헌