Introduction
At present, it is impossible, as a general case, to derive by means of
quantum-mechanical calculations the crystalline structure of metal in
relation to electronic structure of the atom. However, Hanzhorn and
Dellinger indicated a possible relation between the presence of a
cubical volume-centered lattice in subgroups of titanium, vanadium,
chrome and availability in these metals of valent d-orbitals. It is easy
to notice that the four hybrid orbitals are directed along the four
physical diagonals of the cube and are well adjusted to binding each
atom to its eight neighbours in the cubical volume-centered lattice, the
remaining orbitals being directed towards the edge centers of the
element cell and, possibly, participating in binding the atom to its six
second neighbours
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