Ion Doping Effects on the Lattice Distortion and Interlayer Mismatch of Aurivillius-Type Bismuth Titanate Compounds

Materials
Yu ChenJianguo Zhu

Abstract

Taking Bismuth Titanate (Bi₄Ti₃O12) as a Aurivillius-type compound with m = 3 for example, the ion (W6+/Cr3+) doping effect on the lattice distortion and interlayer mismatch of Bi₄Ti₃O12 structure were investigated by stress analysis, based on an elastic model. Since oxygen-octahedron rotates in the ab-plane, and inclines away from the c-axis, a lattice model for describing the status change of oxygen-octahedron was built according to the substituting mechanism of W6+/Cr3+ for Ti4+, which was used to investigate the variation of orthorhombic distortion degree (a/b) of Bi₄Ti₃O12 with the doping content. The analysis shows that the incorporation of W6+/Cr3+ into Bi₄Ti₃O12 tends to relieve the distortion of pseudo-perovskite layer, which also helps it to become more stiff. Since the bismuth-oxide layer expands while the pseudo-perovskite layer tightens, an analytic model for the plane stress distribution in the crystal lattice of Bi₄Ti₃O12 was developed from the constitutive relationship of alternating layer structure. The calculations reveal that the structural mismatch of Bi₄Ti₃O12 is constrained in the ab-plane of a unit cell, since both the interlayer mismatch degree and the total strain energy vary with the doping content in ...Continue Reading

References

Nov 2, 2004·Nature·Yasuyoshi SaitoMasaya Nakamura

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Citations

Aug 14, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mohamed FaisalR Jothiramalingam
Nov 16, 2021·The Journal of Physical Chemistry Letters·Jingjing YangYi Xie

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