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Crystal Chemistry and Microwave Dielectric Properties of Ba3Mnb2-xSbxO9(M=Mg, NI, Zn)



M W. Lufaso, E Hopkins, S M. Bell, A Llobet


The effect of Sb5+ substitution on the crystal chemistry and dielectric properties of Ba3MNb2-xSbxO9 (M = Mg, Zn, Ni) was investigated using a combination of X-ray and neutron powder diffraction, and dielectric property measurements at microwave frequencies. Rietveld refinements were carried out to characterize the crystal structures of Ba3ZnSb2O9 and Ba3MgSb2O9, which have a 6H-BaTiO3-type structure. Differences in the bonding preferences between the Nb5+ (d0) and Sb5+ (d10), combined with small changes in the ionic radii influence the observed crystal chemistry. The magnitude and temperature dependence of the dielectric constant were lowest for compounds in the perovskite solid solution range with intermediate Sb5+ contents. Ba3MgNb1.75Sb0.25O9 and Ba3ZnNb1.625Sb0.375O9 display useful dielectric properties, rendering these materials suitable as lower-cost and lower-processing-temperature alternatives to perovskite tantalate ceramics.
Chemistry of Materials


2:1 cation ordering, microwave dielectric, perovskite, solid solution


Lufaso, M. , Hopkins, E. , Bell, S. and Llobet, A. (2017), Crystal Chemistry and Microwave Dielectric Properties of Ba<sub>3</sub>Mnb<sub>2-x</sub>Sb<sub>x</sub>O<sub>9</sub>(M=Mg, NI, Zn), Chemistry of Materials (Accessed April 19, 2024)
Created February 19, 2017