Acoustic properties of multiferroic BiFeO3 over the temperature range 4.2–830 K E. P. Smirnova, A. Sotnikov, S. Ktitorov, N. Zaitseva, H. Schmidt and M. Weihnacht Eur. Phys. J. B, 83 1 (2011) 39-45 Published online: 15 September 2011 DOI: 10.1140/epjb/e2011-20418-1