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Investigations on the influence of defects on the soft mode and the static dielectric constant of group IV-tellurides are reviewed. A stabilization of the cubic structure and a violation of the Lyddane Sachs Teller relation are found. Both effects are explained by a model, which involves coupling of the soft mode to a low frequency defect mode.
The narrow-gap semiconductors PbTe, SnTe, GeTe and their alloys exhibit a tendency for a ferroelectric displacive phase transition from a high-temperature rocksalt structure to a rhombohedral phase at low temperatures. The critical temperatures vary within an exceedingly wide range: −70 K(PbTe) up to 650 K(GeTe). Owing to the outstanding simplicity of their crystal structure and their well-known electronic...
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