Significant dielectric enhancement in 0.3BiFeO[sub 3]–0.7SrBi[sub 2]Nb[sub 2]O[sub 9]

Gu, Haoshuang; Xue, Junmin; Wang, John
September 2001
Applied Physics Letters;9/24/2001, Vol. 79 Issue 13
Academic Journal
Significant dielectric enhancement is observed in 0.3BiFeO[sub 3]–0.7SrBi[sub 2]Nb[sub 2]O[sub 9], when a single-phase layered perovskite structure was formed by sintering the mechanically activated oxide composition. The Curie point of xBiFeO[sub 3]–(1-x)SrBi[sub 2]Nb[sub 2]O[sub 9] was shifted upward with an increase in the BiFeO[sub 3] content. 0.3BiFeO[sub 3]–0.7SrBi[sub 2]Nb[sub 2]O[sub 9] exhibits a dielectric constant of 1.84×10[sup 5] at the Curie point of 750 °C. The lattice dimensions of xBiFeO[sub 3]–(1-x)SrBi[sub 2]Nb[sub 2]O[sub 9] decrease slightly with an increase in the content of BiFeO[sub 3] over the composition range of x=0–0.2, while 0.3 mol BiFeO[sub 3] in SrBi[sub 2]Nb[sub 2]O[sub 9] led to recovery in the lattice dimensions. The much enhanced dielectric properties observed in 0.3BiFeO[sub 3]–0.7SrBi[sub 2]Nb[sub 2]O[sub 9] are therefore due to the enlarged rattling space for both Nb[sup 5+] and in particular for smaller Fe[sup 3+]. © 2001 American Institute of Physics.


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