Luminescence and a New Approach for Detecting Heat Treatment of Sapphire

IF 3.2 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Solid Earth Pub Date : 2024-09-04 DOI:10.5194/egusphere-2024-1529

Teerarat Pluthametwisute, Lutz Nasdala, Chutimun Chanmuang N., Manfred Wildner, Eugen Libowitzky, Gerald Giester, Gamini Zoysa, Chanenkant Jakkawanvibul, Waratchanok Suwanmanee, Tasnara Sripoonjan, Thanyaporn Tengchaisri, Bhuwadol Wanthanachaisaeng, Chakkaphan Sutthirat

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Abstract

Abstract. For decades, unravelling heat treatment of sapphire has been a challenging issue. The present study offers new aspects that support the detection of heat treatment of sapphire. Natural unheated sapphire is distinguishable from heated sapphire by its orange to red luminescence under long-wave ultraviolet (LWUV, 365 nm) light, whereas blue luminescence under short-wave ultraviolet (SWUV, 254 nm) light indicates their heated counterparts. UV-excited photoluminescence shows a linkage between a broad emission spectrum within the orange to red region and orange to red luminescence of natural unheated sapphire under LWUV illumination, as well as an emission spectrum around the green region and blue luminescence of heated sapphire under SWUV illumination. Furthermore, the presence of melt inclusions within dissolved silks may be used as an indicator of heat treatment of sapphire. It seems that Fourier-transform infrared (FTIR) spectroscopy alone is inadequate for distinguishing unheated and heated sapphire. The application of orange to red, and blue luminescence together with melt inclusions offer a novel and practicable procedure for more precise differentiation of unheated versus heated sapphire.

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发光和检测蓝宝石热处理的新方法

摘要几十年来，揭示蓝宝石的热处理一直是一个具有挑战性的问题。本研究为检测蓝宝石的热处理提供了新的支持。天然未加热蓝宝石在长波紫外线（LWUV，365 纳米）下发出橙色到红色的荧光，而在短波紫外线（SWUV，254 纳米）下发出蓝色荧光，这表明它们是加热过的蓝宝石。紫外激发光致发光显示，在 LWUV 光照射下，天然未加热蓝宝石的橙色至红色区域内的宽发射光谱与橙色至红色发光之间存在联系，而在 SWUV 光照射下，加热蓝宝石的绿色区域附近的发射光谱与蓝色发光之间也存在联系。此外，溶解丝中存在的熔融夹杂物也可作为蓝宝石热处理的指标。仅靠傅立叶变换红外光谱似乎不足以区分未加热和加热蓝宝石。橙色、红色和蓝色发光以及熔融夹杂物的应用为更精确地区分未加热和加热蓝宝石提供了一种新颖实用的方法。

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来源期刊

Solid Earth GEOCHEMISTRY & GEOPHYSICS-

CiteScore

6.90

自引率

8.80%

发文量

审稿时长

4.5 months

期刊介绍： Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.