Three historical ‘asteriated’ hydrogen-rich diamonds: growth history and sector-dependent impurity incorporation

Rondeau, B.; Fritsch, Emmanuel; Guiraud, Michel; Chalain, Jean-Pierre; Notari, Franck

doi:10.1016/j.diamond.2004.02.002

Cited by 61 publications

(70 citation statements)

References 31 publications

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“…The a-C:H peak at 2930 cm Ϫ1 occurs in the region that corresponds to absorption of C-H groups on {100}. In hydrogen-rich natural diamond, hydrogen is incorporated mostly in cuboid sectors (35). The 370 nm band is present in brown cuboid sectors while absent in gray octahedral sectors in the same diamond (35).…”

Section: Discussionmentioning

confidence: 96%

“…In hydrogen-rich natural diamond, hydrogen is incorporated mostly in cuboid sectors (35). The 370 nm band is present in brown cuboid sectors while absent in gray octahedral sectors in the same diamond (35). Hydrogen may be incorporated into NV Ϫ complexes on {100} in CVD diamond during its growth.…”

Section: Discussionmentioning

confidence: 99%

“…The 370 nm absorption feature may be associated with hydrogen-related defects (35). CVD diamond annealed above 1400°C but below 1700°C usually attains a brownish pink color, indicating that the pink hue of the annealed CVD diamond is associated with the 550 nm band, and very likely originates from the NV centers.…”

Section: Discussionmentioning

confidence: 99%

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Enhanced optical properties of chemical vapor deposited single crystal diamond by low-pressure/high-temperature annealing

Meng

Yan

Lai

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

101

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Single crystal diamond produced by chemical vapor deposition (CVD) at very high growth rates (up to 150 m/h) has been successfully annealed without graphitization at temperatures up to 2200°C and pressures <300 torr. Crystals were annealed in a hydrogen environment by using microwave plasma techniques for periods of time ranging from a fraction of minute to a few hours. This low-pressure/high-temperature (LPHT) annealing enhances the optical properties of this high-growth rate CVD single crystal diamond. Significant decreases are observed in UV, visible, and infrared absorption and photoluminescence spectra. The decrease in optical absorption after the LPHT annealing arises from the changes in defect structure associated with hydrogen incorporation during CVD growth. There is a decrease in sharp line spectral features indicating a reduction in nitrogen-vacancy-hydrogen (NVH ؊ ) defects. These measurements indicate an increase in relative concentration of nitrogen-vacancy (NV) centers in nitrogencontaining LPHT-annealed diamond as compared with as-grown CVD material. The large overall changes in optical properties and the specific types of alterations in defect structure induced by this facile LPHT processing of high-growth rate single-crystal CVD diamond will be useful in the creation of diamond for a variety of scientific and technological applications. microwave plasma ͉ hydrogen ͉ vacancy ͉ nitrogen

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced optical properties of chemical vapor deposited single crystal diamond by low-pressure/high-temperature annealing

Meng

Yan

Lai

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

101

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“…Type Ib natural diamonds commonly contain clusters of small needle-like inclusions that are usually associated with yellow color zoning and rarely occur in other diamond types (GIA staff observations; figure 9B). Finegrained, patterned clouds that form cross-like shapes are common in type Ia diamonds that contain high concentrations of hydrogen impurities (known as "asteriated" diamonds; see Wang and Mayerson, 2002;Rondeau et al, 2004, and references therein). Synthetic type Ib diamonds often show distinctive color zoning or metallic flux inclusions under magnification (Shigley et al, 2004).…”

Section: Inclusions and Strain Patterns: Gemologicalmentioning

confidence: 99%

The "Type" Classification System of Diamonds and Its Importance in Gemology

Breeding¹,

Shigley²

2009

Gems & Gemology

113

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“…The general characteristics of mixed-habit diamonds are: very high nitrogen concentrations ([900 ppm, but commonly [2,000 ppm); preferential uptake of nitrogen in the octahedral sectors; IR-active hydrogen, observed only in the cuboid sectors; platelets, commonly reported to occur only in the octahedral sectors (Welbourn et al 1989;Bulanova et al 2002;Cartigny et al 2003;Rondeau et al 2004;Zedgenizov and Harte 2004;Lang et al 2007;Howell et al 2012a). However, this final characteristic is not as consistent between studies as the others, leading some workers to question whether nitrogen aggregation and the resultant platelet formation are actually sector dependent as well.…”

Section: Introductionmentioning

confidence: 98%

Platelet development in cuboid diamonds: insights from micro-FTIR mapping

Howell

O’Neill

Grant

et al. 2012

Contrib Mineral Petrol

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Fourier transform infrared mapping of diamonds can reveal detailed information on impurities, with a spatial context. We apply this technique, combined with in situ isotopic analysis of carbon, to the study of cuboid diamond growth in a sample that exhibits some mixedhabit growth. While there has been some uncertainty in the literature regarding sectoral differences in nitrogen aggregation and subsequent platelet development, the data from this study appear far more conclusive. We show that despite nitrogen being concentrated in octahedral sectors, there is no detectable difference in the concentrationadjusted rate of nitrogen aggregation within octahedral and cuboid sectors. However, the resultant platelet development is significantly reduced in cuboid sectors compared to contemporaneously formed octahedral sectors. This finding has significant implications for the classification of diamonds using the relationship between their platelet intensity and the absorption caused by B centres. It means that cuboid diamonds naturally fall below the linear relationship that has been termed regular, which would lead to them being incorrectly interpreted as having experienced heating or deformation. The data also support earlier suggestions that large hydrogen concentrations in the diamond-forming fluid may be required for cuboid growth. We further suggest that high nitrogen and hydrogen concentrations are required for mixed-habit diamond growth, which might be the product of specific fluid chemistries that occur in reducing mantle environments.

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Three historical ‘asteriated’ hydrogen-rich diamonds: growth history and sector-dependent impurity incorporation

Cited by 61 publications

References 31 publications

Enhanced optical properties of chemical vapor deposited single crystal diamond by low-pressure/high-temperature annealing

Enhanced optical properties of chemical vapor deposited single crystal diamond by low-pressure/high-temperature annealing

The "Type" Classification System of Diamonds and Its Importance in Gemology

Platelet development in cuboid diamonds: insights from micro-FTIR mapping

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