Abstract:
Barium sodium niobate (BNN) single crystals are studied by IR spectroscopy, time-domain THz transmission spectroscopy, HF coaxial wave-guide technique and LF dielectric spectroscopy to cover the frequency range 102-1014 Hz in a wide temperature interval. The dielectric response parallel and perpendicular to the polar c-axis is discussed. The ferroelectric transition at T c = 830 K is driven by a relaxational soft mode coupled with another central-mode type relaxation which both gradually disappear on cooling in the ferroelectric phase. Below T i the parameters of the expected IR active amplitudon were estimated. The low-temperature permittivity increase on cooling for the field direction has been explained by an incipient proper ferroelectric-ferroelastic transition driven by an IR and Raman active B2-symmetry soft mode.
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Received 24 August 2002 Published online 19 December 2002
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Buixaderas, E., Porokhonskyy, V., Paskhin, A. et al. Broad-band dielectric spectroscopy of Ba 2NaNb 5O 15 single crystal. Eur. Phys. J. B 30, 319–329 (2002). https://doi.org/10.1140/epjb/e2002-00385-4
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DOI: https://doi.org/10.1140/epjb/e2002-00385-4