Feasibility for non-destructive discrimination of natural and beryllium-diffused sapphires using Raman spectroscopy
- Authors
- Chang, Kyeol; Lee, Sanguk; Park, Jimin; Chung, Hoeil
- Issue Date
- Mar-2016
- Publisher
- ELSEVIER
- Keywords
- Natural sapphire; Be-diffused sapphire; Representative Raman sampling; Multivariate discrimination
- Citation
- TALANTA, v.149, pp.335 - 340
- Indexed
- SCIE
SCOPUS
- Journal Title
- TALANTA
- Volume
- 149
- Start Page
- 335
- End Page
- 340
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/154994
- DOI
- 10.1016/j.talanta.2015.11.064
- ISSN
- 0039-9140
- Abstract
- Raman spectroscopy based non-destructive discrimination between natural and beryllium-diffused (Be diffused) sapphires has been attempted. The initial examination of Raman image acquired on a sapphire revealed that microscopic structural and compositional heterogeneity was apparent in the sample, so acquisition of spectra able to represent a whole body of sapphire rather than a localized area was necessary for a reliable discrimination. For this purpose, a wide area illumination (WAI) scheme (illumination area: 28.3 mm(2)) providing a large sampling volume was employed to collect representative Raman spectra of sapphires. Upon the diffusion of Be into a sapphire, the band shift originated from varied lattice structure by substitution of Be at cation sites was observed and utilized as a valuable spectral signature for the discrimination. In the domain of principal component (PC) scores, the groups of natural and Be-diffused sapphires were identifiable with minor overlapping and the cross validated discrimination error was 7.3% when k-Nearest Neighbor (k-NN) was used as a classifier.
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