Acoustic studies of the ferroelastic phase transition in the K3Na(CrO4)2 crystal

Autor:	Z. Tylczynski, E. V. Charnaya, A. K. Radzhabov, C. S. Wur, B. Mroz, Cheng Tien
Rok vydání:	2003
Předmět:	Phase transition Condensed matter physics Chemistry Attenuation Attenuation coefficient Mineralogy Transverse wave Acoustic wave Atmospheric temperature range Condensed Matter Physics Landau theory Longitudinal wave Electronic Optical and Magnetic Materials
Zdroj:	physica status solidi (b). 240:240-245
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.200301853
Popis:	Ultrasonic studies of the K 3 Na(CrO 4 ) 2 crystal were carried out within a temperature range of 185 to 295K. Temperature dependences of the velocity and attenuation coefficient for the xx and zz longitudinal acoustic waves and the yx and zx transverse waves were measured. Noticeable anomalies in velocity and attenuation for transverse as well as for longitudinal waves were found near the ferroelastic phase transition which temperature was 235.5K. The anomalies in the c 44 and c 66 elastic moduli were treated on the base of the Landau theory assuming the component e 4 as the primary order parameter and (e 2 -e 1 )/2 as the secondary one. Six elastic moduli, c 11 , c 33 , c 44 , c 66 , c 12 , and c 14 were evaluated at room temperature.
Databáze:	OpenAIRE
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