Magnetically Driven Dielectric and Structural Behavior in Bi0.5La0.5FeO3
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- 作者：Christopher M. Kavanagh ; Richard J. Goff ; Aziz Daoud-Aladine ; Philip Lightfoot ; Finlay D. Morrison
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：December 11, 2012
- 年：2012
- 卷：24
- 期：23
- 页码：4563-4571
- 全文大小：535K
- 年卷期：v.24,no.23(December 11, 2012)
- ISSN：1520-5002
文摘
A detailed structural analysis of the antiferromagnetic (Gz-type) lanthanum doped bismuth ferrite - Bi0.5La0.5FeO3 (Pn鈥瞞a鈥?/i>) 鈥?using variable-temperature powder neutron diffraction is reported. The analysis highlights a structural link between changes in the relative dielectric permittivity and changes in the FeO6 octahedral tilt magnitudes, accompanied by a structural distortion of the octahedra with corresponding A-site displacement along the c-axis; this behavior is unusual due to an increasing in-phase tilt mode with increasing temperature. The anomalous orthorhombic distortion is driven by magnetostriction at the onset of antiferromagnetic ordering resulting in an Invar effect along the magnetic c-axis and anisotropic displacement of the A-site Bi3+ and La3+ along the a-axis.