hexagonal close-packed structure

hexagonal close-packed structure

[hek′sag·ə·nəl ¦klōs ¦pakt ′strək·chər]
(crystallography)
Close-packed crystal structure characterized by the regular alternation of two layers; the atoms in each layer lie at the vertices of a series of equilateral triangles, and the atoms in one layer lie directly above the centers of the triangles in neighboring layers. Abbreviated hcp structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
At [lambda] < 2 [micro]m, compared to the pure semi-infinite tungsten slab, the absorptivity is increased from less than 50% to close 100%, as the hexagonal close-packed structure provides an impedance matching mechanism between free space and tungsten.
Because of the rotational symmetry of the hexagonal close-packed structure, the structure is repeated every 60[degrees].
The whole compound exhibits hexagonal close-packed structure with magnetic moments of cations aligned along c-axis [6,7].
The new data suggest that the core could be either one gargantuan crystal of silicon-tainted iron with a hexagonal close-packed structure or a blend of iron-rich minerals that includes body-centered cubic crystals.