What is it about?
We find that in the IC phase, because static displacements of chemically unlike atoms n a modulated state differ in amplitude while having the same wavelength. As a result, the bond tilts in the direction perpedicular to the polarization plane increase. From this standpoint, it appears natural to expect observation of the invar properties in the direction perpendicular to the polarization plane, as this indeed occurs in the many cases.
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Why is it important?
It would apparently be useful to proceed the TEC measurements to find exact modulation region.
Perspectives
The results of the work show that standard d (T) measurements using Bragg reflections can be used to advantage in determination of the atomic displacement plane in a modulation wave. It would apparently be useful to proceed with TEC measurements for zone planes with the same wavevector direction.
Dr Bagautdin Bagautdinov
Read the Original
This page is a summary of: The invar effect and phase transitions in Cs2ZnI4 crystals, Physics of the Solid State, January 1999, Pleiades Publishing Ltd,
DOI: 10.1134/1.1130742.
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