Dissimilarity of polar displacements in barium and lead based relaxors

Phelan, D.; Millican, J. N.; Gehring, P. M.
August 2010
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p072903
Academic Journal
Powder neutron diffraction experiments were performed on the relaxor compound, Ba(Zn1/3Nb2/3)0.95Ti0.05O3, which was recently shown to have stronger frequency dependence in its permittivity than many Pb-based relaxors (PBR), such as PbMg1/3Nb2/3O3 [L. Khemakhem et al., J. Alloys Compd. 452, 451 (2008)]. Several notable differences in structural properties were observed in the present measurements compared to PBR. In particular, much smaller atomic displacement parameters were found, especially on the A (Ba) site, which indicates that the local shifts of the Ba atoms are much smaller than the Pb shifts in PBR. Moreover, no signature of electrostrictive strain is apparent in the thermal expansion, and instead the thermal expansion is much larger at low temperatures than for PBR.


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