Inelastic neutron scattering study of lead-free relaxor ferroelectric (Na0.5Bi0.5)0.96Ba0.04TiO3 single crystal

Author： Ondrejkovic P.   Hlinka J.   Kempa M.   Kulda J.   Luo H.   Zhang Q.  

Publisher： Taylor & Francis Ltd

ISSN： 0141-1594

Source： Phase Transitions: A Multinational Journal, Vol.84, Iss.9-10, 2011-09, pp. : 829-836

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Abstract

Low frequency phonons and diffuse scattering have been investigated in a single crystal of (Na0.5Bi0.5)1−x Ba x TiO3 solid solution with composition (x = 4%) close to the morphotropic phase boundary by means of inelastic neutron scattering. Constant-energy scans for momentum transfer Q = (2, 2, q) reveal a typical waterfall-type dispersion at room temperature. The anomalous steep dispersion occurs at q wf ≍ 0.15 r.l.u., similar to lead-based relaxors. Since these measurements are done well below the temperature interval of the relaxor-like dielectric dispersion, our findings support a generic, anharmonic phonon-coupling nature of the phenomenon.

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