Journal
JOURNAL OF APPLIED PHYSICS
Volume 123, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5023726
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- Department of Science and Technology (DST)
- Government of India
- Japan Society for Promotion of Science (JSPS) of Japan
- Science and Engineering Research Board of India
- Department of Science and Technology (DST), India [DST/INSPIRE/04/2014/002442]
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We report here the relaxor ferroelectric (RFE) behaviour in a multiferroic solid solution system, (Bi1-xBax)(Fe1-xTix)O-3, at a critical disorder level of x(C) similar to 0.35 in BiFeO3 and 0.65 (i.e., 1-x(C) = 0.35) in BaTiO3 similar to the 1:2 ratio of Mg2+ and Nb5+ in the canonical RFE Pb(Mg1/3Nb2/3)O-3. This Pb-free system, like canonical Pb-based RFEs, does not exhibit macroscopic symmetry breaking and shows only the signatures of ergodicity breaking at Vogel-Fulcher freezing temperature (T-VF). The atomic displacement parameters (ADPs) of Fe3+/Ti4+ and O2-, obtained using high wave vector (Q) and high-resolution synchrotron x-ray diffraction data as a function of temperature, show anomalous diffuse peaks in the Curie range. It is shown that the diffuse peak in ADPs is due to softening of the vibrational frequencies of the B-O chain (B = Fe3+/Ti4+ and O = O2-) below the Burns temperature (T-B) followed by hardening below the characteristic temperature (T'(m)), which corresponds to a peak in the dielectric permittivity (epsilon'). Published by AIP Publishing.
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