Acoustic properties of multiferroic BiFeO3 over the temperature range 4.2–830 K
Ioffe Physical Technical Institute, 26 Polytekhnicheskaya, St. Petersburg, 194021, Russian Federation
2 IFW Dresden (Leibniz Institute for Solid State- and Materials Research Dresden), Helmholtz Str. 20, 01069 Dresden, Germany
Corresponding author: a email@example.com
Revised: 11 July 2011
Published online: 15 September 2011
The longitudinal acoustic wave velocity and attenuation in BiFeO3 ceramics have been measured by ultrasonic pulse-echo technique at a frequency of 10 MHz in the temperature range from 4.2 K to 830 K. The anomalies observed in the sound velocity and attenuation behavior versus temperature are attributed to the assumed relaxation in the temperature range 200–500 K and antiferromagnetic phase transition at higher temperatures. Order parameter fluctuations along with magnetostriction are discussed as the factors determining the acoustic wave velocity anomaly in the vicinity of the antiferromagnetic phase transition point.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011