Micromorphology and internal structure of apographitic impact diamonds: SEM and TEM study

Diamond synthesis in aluminum matrix in molten alkali-halide at ambient pressure

“…Therefore, carbon atoms' flow we can consider as a carbon fluid in aluminum cells' emptiness. During natural endogenous diamond crystallization of the fluid takes place in a relatively free space (mostly microscopic cavities and cracks) which can explain idiomorphism most of its crystals [34]. We observe nanodiamond formation through the crack too (Fig.…”

“…8). So it is obvious that the part of diamond cubes formed by the growth of fibers and subparallel microblocks along the (100) direction, i.e., they tend to normal (fibrous) and microblock (adhesive) growth mechanisms as it takes place in natural endogenic diamonds growth [34].…”

Structure and properties of impact diamonds from the Popigai Deposit and polycrystals based on them

“…Grains of the Popigai diamond are largely of a plate like habit [8], in which the layer structure is traced, i.e., the inheritance of the layer structure of initial graphite takes place. This is indicative of the martensitic type of the lattice rearrangement.…”

“…Numerous studies of impact diamonds point to unique physical prop erties of them [2][3][4]. Therefore, the interest in investigation of this type of diamond, especially once the Pop igai deposit became known, does not become weaker up to now [5][6][7][8][9]. Much attention is given to studies of optical properties, phase composition and crystal genesis [10][11][12][13].…”

Surface morphology and structural types of natural impact apographitic diamonds

“…In principle, the crystallographic characteristics including symmetry relationships and anisotropic surface reactivity, and surface energy are expected to result in distinct growth and etch figures dependent on the crystallographic orientation of the surface, e.g., [7,8]. For example, it has been demonstrated that the growth and etch figures on the (0001) surfaces of the paramorphoses allow us to qualitatively assess the phase composition and to establish the orientation relationship between the original and newly formed phases [9]. This data allows the establishing of a mechanism of the active phase transitions.…”