Algebraic search for cooperative rotational rigid-unit modes
نویسندگان
چکیده
منابع مشابه
Rigid-unit modes in tetrahedral crystals.
The 'rigid-unit mode' (RUM) model requires unit blocks, in our case tetrahedra of SiO(4) groups, to be rigid within first order of the displacements of the oxygen ions. The wavevectors of the lattice vibrations, which obey this rigidity, are determined analytically. Lattices with inversion symmetry yield generically surfaces of RUMs in reciprocal space, whereas lattices without this symmetry y...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations and Advances
سال: 2018
ISSN: 2053-2733
DOI: 10.1107/s0108767318097131