Dynamics of α-β transition in NaH3(SeO3)2: Brillouin scattering study

Autor:	B. B. Lavrenčič, S. Trost, Martin Čopič, I. Levstek
Rok vydání:	1976
Předmět:	Brillouin zone Condensed Matter::Materials Science Materials science Transition point Condensed matter physics Brillouin scattering Phase (matter) Dielectric Soft modes Condensed Matter Physics Ferroelectricity Spectral line Electronic Optical and Magnetic Materials
Zdroj:	Ferroelectrics. 14:637-639
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150197608236688
Popis:	We have measured the Brillouin spectra of NaH3(SeO3)2 in the α, β and 7 phase. According to dielectric and nmr data we suggest that the αβ transition is an improper ferroelectric one, the soft mode being at the Z (001/2) point of the Brillouin zone. The resulting thermodynamic theory explains the discontinuity of the elastic constants around α-β transition point but not the softening of the c55 elastic constant in the α phase which results from the fluctuations of the order parameter.
Databáze:	OpenAIRE
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