Magnetic transition and spin rotation in a new multiferroic Ba3TaFe3Si2O14 observed by the Mössbauer spectroscopyI. S. Lyubutin, P. G. Naumov and B. V. Mill’EPL, 90 6 (2010) 67005DOI: https://doi.org/10.1209/0295-5075/90/67005