UDC  549.548.211

V.M. Kvasnytsya 1, http://orcid.org/0000-0002-3692-7153

I.V. Kvasnytsia 2, Researcher ID: H-1306-2019

I.V. Gurnenkо 1.

1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: vmkvas@hotmail.com

2 Kyiv Taras Shevchenko National University. Educational-scientific institute "Institute of Geology"

90, Vasylkivska Str., Kyiv, Ukraine, 03022

E-mail: ikvasnytsya@gmail.com


Language: Ukrainian

Mineralogical journal 2019, 41 (2): 18-25


Diamond microcrystals are obtained from gas (C2H2 and O2) at a temperature of 600-1000 °С and atmospheric pressure on molybdenum substrates. The crystals were produced in the area of 5 mm in diameter, the growth rate was 148-160 (μm/h). SEM observations were used to study the deposited diamonds. The size of the diamond crystals is mainly 5-30 µm. Individual polyhedrons, their simple and complex intergrowths have sizes of 30-50 µm, and some aggregates 200 µm. The crystals are characterized by a large number of crystallization centers as well as by their great variety, the latter depends on the size of individuals and on centers of their crystallization. Diamonds show various polyhedrons, intergrowths and aggregates. Large crystals are of cubic and cube-octahedral habit. These crystals are found at the center of the coatings. Small crystals are of octahedrons and cube-octahedrons; they often form cyclic twins according to the spinel law. These crystals grew on the outskirts of the coatings. The unusual complex twins of diamond are icosahedrons. Autoepitaxial diamond growth is also noticeable. The morphological signs of the difference between diamond crystals depending on crystallization on the surface of the substrate relative to the power source and time of growth are revealed. The morphological features of CVD diamond crystals (a host of crystallization centers, a variety in morphology, rough lamination, frequent formation of irregular intergrowths and twins) point to a considerable oversaturation of the medium with C and on a high diamond growth rate.

Keywords: diamond films, microcrystalline diamond, morphology, polyhedrons, simple and complex twins, aggregates, chemical vapor deposition process.


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