Rigid-unit phonon modes and structural phase transitions in framework silicates
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...One may argue that the remarkable “rigidity” of the polarization vectors of the distortion modes is due to the fact that they correspond to rigid unit modes (RUMs) ((Giddy et al., 1993), (Hammonds et al., 1996)) of the tetrahedral framework in the leucite structure....
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...For these simple structures with rather rigid BX6 octahedra, a mode description is quite simple; many normal modes are fully determined by symmetry and can be identified with tilts or RUMs (Giddy et al. (1993), Hammonds et al. (1996)) of the framework of octahedra....
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"Rigid-unit phonon modes and structu..." refers background in this paper
...The theory of coherent domain packets (Sapriel 1975) shows that the strain energy is minimized if the boundaries lie perpendicular to the [,+1,0] axes....
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...Sapriel, J. (1975) Domain wall orientations in ferroelastics....
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