Broad-band dielectric spectroscopy of Ba2NaNb5O15 single crystal E. Buixaderas, V. Porokhonskyy, A. Paskhin, M. Savinov and J. Petzelt Eur. Phys. J. B, 30 3 (2002) 319-329 Published online: 19 December 2002 DOI: 10.1140/epjb/e2002-00385-4