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Holt, M, Zschack P, Hong H, Chou MY, Chiang TC.  2001.  X-ray studies of phonon softening in TiSe2, Apr. Physical Review Letters. 86:3799-3802., Number 17 AbstractWebsite

The charge-density-wave transition in TiSe2, which results in a commensurate (2 X 2 X 2) superlattice at temperatures below similar to 200 K, presumably involves softening of a zone-boundary phonon mode. For the first time, this phonon-softening behavior has been examined over a wide temperature range by synchroton x-ray thermal diffuse scattering.