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Feasibility for non-destructive discrimination of natural and beryllium-diffused sapphires using Raman spectroscopy

Title
Feasibility for non-destructive discrimination of natural and beryllium-diffused sapphires using Raman spectroscopy
Author
정회일
Keywords
Natural sapphire; Be-diffused sapphire; Representative Raman sampling; Multivariate discrimination
Issue Date
2016-01
Publisher
ELSEVIER SCIENCE BV
Citation
TALANTA, v. 149, Page. 335-340
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. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0039914015305166?via%3Dihubhttp://hdl.handle.net/20.500.11754/30368
ISSN
0039-9140; 1873-3573
DOI
10.1016/j.talanta.2015.11.064
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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