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Phase Coexistence in Cs3Bi2I9 Ferroelastics: Optical,
Dilatation and Ultrasonic Velocity Studies
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I.Girnyk, O.Krupych, I.Martunyuk-Lototska, F.Motsnyi and R.Vlokh
The results for dilatometric, ultrasonic velocity and the domain struct-ure
studies of Cs3Bi2I9 crystals in the course of ferroelastic phase trans-ition
are presented. It is shown that the phase transition in Cs3Bi2I9 is of
the first order. Basing on the thermal expansion results and the data obtained
for the elastic stiffness of Cs3Bi2I9 crystals, the latent heat Q=79J/kg
at Tc is calculated. The region between 183K and 221K (at cooling) is identified
as a heterostructure region, where ferroelastic and paraelastic phases
coexist.
Key words: ferroelastics, domain structure, heterophase structure,
ultrasonic velocity, latent heat, Cs3Bi2I9 crystals
PACS 42.25.Ja, 64.70.Kb, 77.80.Dj
doi 10.3116/16091833/4/4/165/2003 |
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