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Morphological features of synthetic diamond microcrystals subjected to oxidative etching.

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Title: Morphological features of synthetic diamond microcrystals subjected to oxidative etching.
Authors: Bokhonov, Boris B.1 (AUTHOR) bokhonov@solid.nsc.ru, Gerasimov, Konstantin B.1 (AUTHOR), Mikhailenko, Mikhail A.1 (AUTHOR)
Source: Diamond & Related Materials. Jun2023, Vol. 136, pN.PAG-N.PAG. 1p.
Subjects: Artificial diamonds, Crystal etching, Diamond crystals, Etching, Diamonds, Crystal morphology, High temperatures, Atmospheric temperature
Abstract: In the present work, the morphological changes of synthetic diamond microcrystals of cuboctahedral shape upon oxidative etching in oxygen or synthetic air at elevated temperatures were studied. It was found that, at the early stages, selective etching of the {111} facets occurs, resulting in the formation of triangular etch pits. Crystals etched at 600–700 °C up to high transformation degrees are of skeletal type: in these crystals, the {111} facets are severely etched. At temperatures above 700 °C, the {100} facets start demonstrating etch pits. These pits are of square shape and have a stepped morphology. Oxidative etching at 900 °C leads to the formation of diamond crystals of antiskeletal type at high transformation degrees (30–50 %). It is suggested that the observed change in the morphology of the diamond crystals with temperature of the oxidative etching is related to the change in the ratio of the etching rates of the {111} and {100} facets. [Display omitted] • Below 700°С, oxidative etching of {111} facets of diamond occurs. • Oxidative etching below 700°С results in the formation of skeletal diamond crystals. • Above 700°С, both {111} and {100} facets experience etching. • Oxidative etching at 900°С results in formation of antiskeletal diamond crystals. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In the present work, the morphological changes of synthetic diamond microcrystals of cuboctahedral shape upon oxidative etching in oxygen or synthetic air at elevated temperatures were studied. It was found that, at the early stages, selective etching of the {111} facets occurs, resulting in the formation of triangular etch pits. Crystals etched at 600–700 °C up to high transformation degrees are of skeletal type: in these crystals, the {111} facets are severely etched. At temperatures above 700 °C, the {100} facets start demonstrating etch pits. These pits are of square shape and have a stepped morphology. Oxidative etching at 900 °C leads to the formation of diamond crystals of antiskeletal type at high transformation degrees (30–50 %). It is suggested that the observed change in the morphology of the diamond crystals with temperature of the oxidative etching is related to the change in the ratio of the etching rates of the {111} and {100} facets. [Display omitted] • Below 700°С, oxidative etching of {111} facets of diamond occurs. • Oxidative etching below 700°С results in the formation of skeletal diamond crystals. • Above 700°С, both {111} and {100} facets experience etching. • Oxidative etching at 900°С results in formation of antiskeletal diamond crystals. [ABSTRACT FROM AUTHOR]
ISSN:09259635
DOI:10.1016/j.diamond.2023.109934