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Inne
Brillouin scattering study of elastic properties in ferroelectric (CH3NH3)5Bi2Br11 crystal.
Autorzy
Rok wydania
1993
Czasopismo
Numer woluminu
146
Strony
37-43
DOI
10.1080/00150199308008524
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Elastic properties of (CH3NH3)5Bi2Br11 (MAPBB) orthorhombic (mm2) molecular-ionic crystal have been studied employing Brillouin scattering technique. The values of all elastic stiffness constants c ij were measured at room temperature. Dispersions of refractive indices in the visible region were determined at room temperature too. No anomaly of the longitudinal c 22− and the transverse c 44-mode frequency around the temperature of second order phase transition T c = 311.5 K was observed whereas the longitudinal c 33-mode frequency exhibits a step of 1.5% near 306 K. Results were analyzed in framework of Landau free energy expansion and with Landau-Khalatnikov approximation.
Słowa kluczowe
Brillouin scattering, elastic stiffness, acoustic phonons, ferroelectrics, (CH3NH3)5Bi2Br11
Adres publiczny
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