Cathodoluminescence spectra of diamonds in UHP rocks from the Kokchetav Massif, Kazakhstan

Iancu, Ovidiu Gabriel; Cossio, Roberto; Korsakov, Andrey V.; Compagnoni, Roberto; Popa, C.

doi:10.1016/j.jlumin.2008.03.023

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…At room temperature the phonon replicas are more difficult to resolve than when measured at liquid nitrogen (LN) temperature; nevertheless, it was still possible to fit the phonon replicas and calculate ħω for the various defects. For the N-V 0 it is approximately 50 meV, which compares well to LN measured values of 45 meV (Iancu et al, 2008) and 50 meV (Rondeau et al, 2008). For the N 2 V defect we measure ħω = 35 meV [LN 40 meV (Davies, 1981; Rondeau et al, 2008) and 39 meV (Iancu et al, 2008)].…”

Section: Resultssupporting

confidence: 88%

Hyperspectral Cathodoluminescence Examination of Defects in a Carbonado Diamond

et al. 2012

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Hyperspectral cathodoluminescence mapping is used to examine a carbonado diamond. The hyperspectral dataset is examined using a data clustering algorithm to interpret the range of spectral shapes present within the dataset, which are related to defects within the structure of the diamond. The cathodoluminescence response from this particular carbonado diamond can be attributed to a small number of defect types: N-V0, N2V, N3V, a 3.188 eV line, which is attributed to radiation damage, and two broad luminescence bands. Both the N2V and 3.188 eV defects require high-temperature annealing, which has implications for interpreting the thermal history of the diamond. In addition, bright halos observed within the diamond cathodoluminescence, from alpha decay radiation damage, can be attributed to the decay of 238U.

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Section: Resultssupporting

confidence: 88%

Hyperspectral Cathodoluminescence Examination of Defects in a Carbonado Diamond

et al. 2012

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“…was the first who could polish thermochemically extracted the metamorphic diamond crystals and they found up to 12 growth zones, while only 2 growth stages were detected by CL on rough surface of diamond crystals from the Kokchetav marble . Later some CL studies of metamorphic diamond were done in situ , but in all these studies the subject material was relatively large cuboid diamond crystals similar to that presented in Fig. .…”

Section: Resultsmentioning

confidence: 95%

“…CL imaging or topography is a very powerful tool for studying the internal morphology of minerals and especially of diamonds . But CL topography does not automatically identify the elements responsible for the CL emission; nor does it give quantitative data for their concentrations .…”

Section: Resultsmentioning

confidence: 99%

“…. Study of diamond cuboids reveals concentric zones of variable luminescence using panchromatic and monochromatic diamond CL images ( see their Figs ). The inhomogeneous broadening 2.156‐eV ZPL peak suggests the presence of a higher concentration of defects in the rim compared to the core.…”

Section: Resultsmentioning

confidence: 99%

“…Since the discovery of metamorphic diamond crystals it has been little known about their internal morphology because of their small size, which precludes an application of traditional techniques . Cathodoluminescence of large diamond crystals (up to 500 µm) from the garnet–clinopyroxene rocks from the ultrahigh‐pressure metamorphic (UHPM) Kokchetav massif performed by reveals that generally habitus of diamond crystals remains the same and did not change from the nucleation time to the end of growth . found that degree of crystalline quality of these crystals is not homogeneous.…”

Section: Introductionmentioning

confidence: 99%

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Internal diamond morphology: Raman imaging of metamorphic diamonds

Korsakov

Toporski²,

Dieing³

et al. 2015

J Raman Spectroscopy

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Confocal 2‐D and 3‐D Raman imaging of the Kokchetav metamorphic diamonds from different rock types reveals that these diamonds have a rather complex internal morphology. The diamond shows a strong change in the position of the diamond Raman line as well as the width of this line, which could be found both in the XY and in the YZ scan. These features indicate variations in the crystalline quality of the diamond. The broadest lines are located in the center of the octahedral diamond inclusion whereas the material close to the diamond–garnet interface shows smaller line widths. These features were also found for thermochemically extracted diamond crystals, which are not armored by host mineral, and in situ for inter‐ and intragranular diamond. Furthermore, host–garnet display no evidence for broadening or up‐shift of main Raman bands, indicating very low (below detection limit) residual strain. Thus the broadening and upshift of main diamond band do not relate to residual strain in inclusion–host systems. A comparison of Raman imaging results with cathodoluminescence images reveals that the distribution of defects, which cause the cathodoluminescence of diamond crystals, can be traced by Raman imaging. The 2‐D and 3‐D Raman imaging is a very powerful tool for study of internal morphology and growth pattern of metamorphic diamond, even it is a small crystal less than 10 µm in size. The growth pattern for octahedral diamond crystals from garnet–clinozoisite gneisses were obtained for the first time by Raman imaging. Copyright © 2015 John Wiley & Sons, Ltd.

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