Title :
Acoustic properties of multiferroics PbFe1/2Ta1/2O3 and BiFeO3 at Néel temperature
Author :
Weihnacht, M. ; Sotnikov, A. ; Schmidt, H. ; Smirnova, E. ; Ktitorov, S.
Author_Institution :
IFW Dresden (Leibniz Inst. for Solid State & Mater. Res.), Dresden, Germany
Abstract :
The longitudinal acoustic wave velocity and attenuation in PbFe1/2Ta1/2O3 and BiFeO3 ceramics have been measured by ultrasonic pulse-echo technique in the temperature range from 50 K to 530 K and from 250 K to 830K, respectively. The anomalies observed in the sound velocity behavior versus temperature in the case of PbFe1/2Ta1/2O3 were correlated with Burns temperature and temperature range of relaxor ferroelectric and antiferromagnetic states coexistence. BiFeO3 demonstrates wide minimum of acoustic wave velocity at Neél temperature. Magnetostriction along with order parameter fluctuations are discussed as the factors determining the acoustic wave velocity anomaly in the vicinity of the antiferromagnetic phase transition point.
Keywords :
Neel temperature; acoustic wave absorption; acoustic wave velocity; antiferromagnetic materials; bismuth compounds; ferroelectric ceramics; iron compounds; lead compounds; magnetostriction; multiferroics; relaxor ferroelectrics; ultrasonic measurement; BiFeO3; Burns temperature; Neel temperature; PbFe0.5Ta0.5O3; acoustic properties; acoustic wave velocity anomaly; antiferromagnetic phase transition point; antiferromagnetic state; ceramics; longitudinal acoustic wave attenuation; longitudinal acoustic wave velocity; magnetostriction; multiferroics; order parameter fluctuations; relaxor ferroelectric state; sound velocity behavior; temperature 50 K to 830 K; ultrasonic pulse-echo technique; Acoustics; Heating; Magnetoacoustic effects; Temperature dependence; Temperature distribution; Temperature measurement; acoustic properties; magnetic ferroelectrics; multiferroics; relaxor ferroelectrics;
Conference_Titel :
Applications of Ferroelectrics (ISAF/PFM), 2011 International Symposium on and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1162-6
Electronic_ISBN :
978-1-4577-1161-9
DOI :
10.1109/ISAF.2011.6014160
