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Ziegler F.,Institute For Physikalische Chemiegeorg August University Gottingentammannstr 6D 37077 Gottingengermany | Murshed M.M.,Solid State Chemical CrystallographyInstitute of Inorganic Chemistry and Crystallography Center for Materials and ProcessesUniversity BremenLeobener Strasse 2D 28359 BremenGermany | Gibhardt H.,Institute For Physikalische Chemiegeorg August University Gottingentammannstr 6D 37077 Gottingengermany | Sobolev O.,Institute For Physikalische Chemiegeorg August University Gottingentammannstr 6D 37077 Gottingengermany | And 2 more authors.
Physica Status Solidi (B) Basic Research | Year: 2016

The full matrix of elastic constants of multiferroic Bi2Mn4O10 has been determined at ambient conditions using phonon spectroscopy. The dispersion of acoustic phonons in a single crystal was measured at the three axes neutron spectrometer PUMA at FRM II for different propagation directions. The magnitudes of the independent nine elastic constants show that the mechanical behavior is strongly anisotropic with a soft direction which almost coincides with the magnetization vector in the low-temperature multiferroic phase. The anisotropy can be related to the different types of links between the building blocks of the mullite structure. Three dimensional representation of the sound velocities (in ms-1) for a transverse acoustic phonon-mode. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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