Defect-and-impurity state of type Ib diamond single crystals of cubic habit

Suprun, E.M.; Kalenchuk, V. A.; Ивахненко, С. А.; Kutsai, A. M.; Lysakovskii, V. V.; Zanevskii, O. A.; Dufu, Van; Shenlin, Van

doi:10.3103/s1063457616060010

Cited by 5 publications

(3 citation statements)

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“…Previous research has suggested that filiform defects arise due to diamond misorientation during cubic diamond synthesis. 15,16 The conditions conducive to cubic diamond growth are similar to those required for the graphite−diamond transition curve, 24 and the growth process may have experienced a slight interruption before quickly resuming. Thus, the misorientation may have subsequently occurred in cubic diamond; however, filiform defects were also observed in cub-octahedron and octahedron diamonds.…”

Section: Resultsmentioning

confidence: 99%

“…14 Therefore, Fe-based catalysts alloy are the most promising for synthesizing high-purity diamonds, but filiform defects are often found in larger diamonds synthesized using these materials. 15,16 The origin of filiform defects in diamonds remains unclear, and there have been no reports on methods to eliminate them. Hence, it is crucial to understand the formation mechanism of filiform defects in diamonds and take effective measures to eliminate or reduce their occurrence.…”

Section: Introductionmentioning

confidence: 98%

“…Fe, Co, Ni, or their alloys are the main catalysts used to obtain high-quality diamonds via HPHT. , Among them, Ni and Co are easily incorporated into diamond lattices via substitution, , but it is much more difficult to incorporate Fe . Therefore, Fe-based catalysts alloy are the most promising for synthesizing high-purity diamonds, but filiform defects are often found in larger diamonds synthesized using these materials. , The origin of filiform defects in diamonds remains unclear, and there have been no reports on methods to eliminate them. Hence, it is crucial to understand the formation mechanism of filiform defects in diamonds and take effective measures to eliminate or reduce their occurrence.…”

Section: Introductionmentioning

confidence: 99%

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Defect and Stress Reduction in High-Pressure and High-Temperature Synthetic Diamonds Using Gradient Cooling Technology

Chen

Zhang

et al. 2020

Crystal Growth & Design

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In order to eliminate filiform defects in high-pressure and high-temperature synthetic diamonds, we have developed a gradient cooling technology and applied it during the synthesis assembly cooling process used during the later stage of diamond synthesis. Finite element simulations showed that the von Mises stress at the end of the synthesis process varied greatly inside the diamond. The rapid thermoelastic stress relief and higher thermoelastic stress generated inside the diamond during rapid cooling of synthesis assembly were the root causes of filiform defects, which were completely eliminated from the diamond interior at a gradient cooling time of 300 min. Raman measurements indicated that the crystalline quality was higher and the compressive stress was lower in the diamond obtained using gradient cooling technology than in the diamond obtained using the traditional rapid cooling technology. This work improves the understanding of the origin of filiform defects in diamond and also provides an effective method for obtaining high-quality diamonds.

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Section: Resultsmentioning

confidence: 99%