Grain boundaries in boron-doped CVD diamond films

Mora, A. E.; Steeds, J. W.; Butler, James E.

doi:10.1016/s0925-9635(01)00590-8

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…The band at 700 nm is very likely identical to a band which is observed in the range 700-730 nm in many deformed and impact diamonds (Plotnikova et al 1980;Galimov et al 1980) as well as in ultra-pure synthetic nanocrystalline diamonds (Ikeda and Sumiya 2016). Initial assignment of this band to dislocationrelated defects (Plotnikova et al, 1980) found some support in Mora et al (2002Mora et al ( , 2003. In a recent detailed investigation of PL spectra of deformed N-containing terrestrial diamonds (Hainschwang et al, 2020) it was suggested that the "700" nm band is a vibronic mode of a ZPL located at 620 nm, which, in turn, is clearly pronounced only at low temperatures.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 67%

Structural peculiarities, mineral inclusions, and point defects in yakutites—A variety of impact‐related diamond

Shiryaev

Pavlushin

Pakhnevich

et al. 2022

Meteorit & Planetary Scien

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An unusual variety of impact-related diamond from the Popigai impact structure -yakutites-is characterized by complementary methods including optical microscopy, X-ray diffraction, radiography and tomography, infrared, Raman, and luminescence spectroscopy providing structural information at widely different scales. It is shown that relatively large graphite aggregates may be transformed to diamond with preservation of many morphological features. Spectroscopic and X-ray diffraction data indicate that the yakutite matrix represents bulk nanocrystalline diamond. For the first time, features of twophonon IR absorption spectra of bulk nanocrystalline diamond are interpreted in the framework of phonon dispersion curves. Luminescence spectra of yakutite are dominated by dislocation-related defects. Optical microscopy supported by X-ray diffraction reveals the presence of single crystal diamonds with sizes of up to several tens of microns embedded into nanodiamond matrix. The presence of single crystal grains in impact diamond may be explained by chemical vapor deposition-like growth in a transient cavity and/or a secondslong compression stage of the impact process due to slow pressure release in a volatile-rich target. For the first time, protogenetic mineral inclusions in yakutites represented by mixed monoclinic and tetragonal ZrO 2 are observed. This implies the presence of baddeleyite in target rocks responsible for yakutite formation.

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Section: Photoluminescence Spectroscopymentioning

confidence: 67%

Structural peculiarities, mineral inclusions, and point defects in yakutites—A variety of impact‐related diamond

Shiryaev

Pavlushin

Pakhnevich

et al. 2022

Meteorit & Planetary Scien

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“…From the structural viewpoint, we considered that the mechanism for this 730 nm peak may be related to an obtuse triple junction, such as those found in CVD-grown polycrystalline diamonds. 17) This mechanism also implies crystal twinning. Mora et al reported the observation of a peak at 732 nm near the obtuse triple junctions of {111}, {221}, and {111}, which are characteristic of CVD diamonds and typically sites of local stress concentration.…”

mentioning

confidence: 99%

“…Chemically and isotopically pure NPD specimens of 3 mm diameter and 1 mm thickness were synthesized by direct conversion from high-purity graphite at pressures of [15][16][17][18] GPa and a temperature of ∼2300 °C for 20 min. The surfaces of both sides of the obtained NPD specimens were finely polished to a mirror finish using a high-speed polishing machine with a metal-bonded diamond wheel.…”

mentioning

confidence: 99%

Optical properties of ultrapure nano-polycrystalline diamond

Ikeda

Sumiya

2016

Jpn. J. Appl. Phys.

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We synthesized an ultrapure nano-polycrystalline diamond (NPD) containing very few chemical impurities (<1 ppm). The 13C concentration of the carbon source was reduced to less than 0.01% by using 12C-enriched high-purity carbon. The ultrapure NPD was synthesized by direct conversion from graphite under high-pressure and high-temperature (HPHT) conditions. We measured the optical properties of the ultrapure NPD, which appeared yellowish, attributed to the structural features of the specimen. Also, the one-phonon absorption peak at 1220 cm−1 is attributed to the broken symmetry of the diamond lattice. Moreover, a defect-related PL peak was found at 730 nm.

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“…Initial works investigating the in uence of quadrijunctions on grain growth suggested that these junctions are sessile, and consequently, freeze the evolution [19]. However, subsequent theoretical [18,13] and experimental studies [20,41] have contradicted this claim, and shown that microstructures continue to evolve despite the predominant presence of quadrijunctions. Consistent with these observations, Fig.…”

mentioning

confidence: 99%

Quadrijunctions-stunted grain growth in duplex microstructure: A multiphase-field analysis

et al. 2020

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In uence of energetically-preferred quadrijunctions on the kinetics of grain growth in textured two-dimensional duplex-microstructure is investigated in this work. A multiphase-eld approach, wherein individual grains are associated with the constituent phases of the microstructure through appropriate initialisation, is adopted for the present study. Di erent forms of anisotropy, phase-dependent and -independent, established by appropriately varying grain boundary energies are considered. While being consistent with the analytical predictions, and existing studies, the present investigation unravels that, irrespective of the nature of anisotropy, the kinetics of the microstructural evolution in duplex polycrystalline system linearly decreases with increase in the density of quadrijunctions.

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Grain boundaries in boron-doped CVD diamond films

Cited by 12 publications

References 9 publications

Structural peculiarities, mineral inclusions, and point defects in yakutites—A variety of impact‐related diamond

Structural peculiarities, mineral inclusions, and point defects in yakutites—A variety of impact‐related diamond

Optical properties of ultrapure nano-polycrystalline diamond

Quadrijunctions-stunted grain growth in duplex microstructure: A multiphase-field analysis

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