Structural distortion and ferroelectric properties of SrBi[sub 2](Ta[sub 1-x]Nb[sub x])[sub 2]O[sub 9]

Shimakawa, Y.; Kubo, Y.; Tauchi, Y.; Kamiyama, T.; Asano, H.; Izumi, F.
October 2000
Applied Physics Letters;10/23/2000, Vol. 77 Issue 17
Academic Journal
Ferroelectric materials of the SrBi[sub 2](Ta[sub 1-x]Nb[sub x])[sub 2]O[sub 9] solid-solution system were synthesized, and their structural and ferroelectric properties were investigated. Atomic displacements of the ions in the (Ta,Nb)O[sub 6] octahedron significantly increase as x increases, which leads to more structural distortion of the perovskite-type unit. The Bi[sub 2]O[sub 2] layer, in contrast, is less distorted in SrBi[sub 2]Nb[sub 2]O[sub 9] than in SrBi[sub 2]Ta[sub 2]O[sub 9]. The contribution of the perovskite-type unit to total ferroelectric polarization is greater in the SrBi[sub 2]Nb[sub 2]O[sub 9] sample, while that of the Bi[sub 2]O[sub 2] layer is less; consequently, the total calculated polarization slightly increases. The ferroelectric Curie temperature also increases from 300 (SrBi[sub 2]Ta[sub 2]O[sub 9]) to 440 °C (SrBi[sub 2]Nb[sub 2]O[sub 9]). Three short (Ta,Nb)-O bonds in the (Ta,Nb)O[sub 6] octahedron, whose lengths are less than 2 Å, have a covalent character, and the substitution of Nb for Ta makes the bonds more covalent. The strong covalent interaction of the (Ta,Nb)-O bonds increases the structural distortion, resulting in the higher ferroelectric Curie temperature and the larger contribution of the perovskite-type unit to the total spontaneous ferroelectric polarization. © 2000 American Institute of Physics.


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