Back to Search Start Over

Automated FTIR mapping of boron distribution in diamond.

Authors :
Howell, D.
Collins, A.T.
Loudin, L.C.
Diggle, P.L.
D'Haenens-Johansson, U.F.S.
Smit, K.V.
Katrusha, A.N.
Butler, J.E.
Nestola, F.
Source :
Diamond & Related Materials. Jun2019, Vol. 96, p207-215. 9p.
Publication Year :
2019

Abstract

Type IIb diamonds are those that contain more boron than nitrogen. The presence of this uncompensated boron gives rise to absorption in the infrared part of the electromagnetic spectrum, extending into the visible region and often resulting in blue colouration. Here we report on the expansion of the DiaMap freeware (for the automated spectral deconvolution of Type I [nitrogen containing] diamonds) to work on Type IIb diamonds, returning concentrations from three boron-related absorption bands, and determining which band provides the most reliable value. The program uses the calibration coefficients of Collins (2010), which show good relative agreement between the three bands, but might require some further study to confirm their absolute accuracy to the uncompensated boron concentration. The methodology of DiaMap_IIb is applicable to all Type IIb diamonds, both natural and synthetic. Analysis of high-resolution Fourier-transform infrared (FTIR) maps of two high-pressure high-temperature (HPHT) synthetic diamonds using DiaMap_IIb, confirm the growth sector dependence of the boron incorporation. Partitioning of boron strongly favours the octahedral {111} sectors. Unlabelled Image • The causes of the three main Boron-related IR absorption bands are reported. • Detailed methodology for processing IR spectra from Type IIb diamonds is provided. • DiaMap_IIb is an automated script for processing batches of spectra from IR mapping. • Boron partitioning strongly favours incorporation into octahedral growth sectors. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09259635
Volume :
96
Database :
Academic Search Index
Journal :
Diamond & Related Materials
Publication Type :
Academic Journal
Accession number :
136911317
Full Text :
https://doi.org/10.1016/j.diamond.2019.02.029