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Structural stability of layered n-LaFeO3–Bi4Ti3O12, BiFeO3–Bi4Ti3O12, and SrTiO3–Bi4Ti3O12 thin films

Published online by Cambridge University Press:  29 October 2012

Jian Zhou ,
Fei-Xiang Wu ,
Y.B. Chen ,
Shan-Tao Zhang  and
Yan-Feng Chen
Jian Zhou
Affiliation:
Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Fei-Xiang Wu
Affiliation:
Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Y.B. Chen*
Affiliation:
Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Shan-Tao Zhang
Affiliation:
Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Yan-Feng Chen
Affiliation:
Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
*
a)Address all correspondence to this author. e-mail: ybchen@nju.edu.cn
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Abstract

A series of layered n-ABO3-doped Aurivillius structures Bi4Ti3O12 (BTO) thin films are synthesized on (001) SrTiO3 (STO) substrates by pulsed laser deposition, where n represents the number of ABO3 perovskite. X-ray diffraction substantiates that these films have expected layered Aurivillius structures. Furthermore, the microstructure of these samples is “systematically” characterized by transmission electron microscopy. It is found that the structure of n-STO-doped BTO becomes unstable when n is equal to 3, as revealed by the occurrence of intergrowth. Similar phenomenon is observed in n-LaFeO3-doped BTO; the layered Aurivillius structure is totally collapsed in the case of n as high as 2.5. In contrast, 3-BiFeO3-doped BTO still keeps perfect Aurivillius structure. The above-observed structural stabilities of these materials are explained by the theoretical formation enthalpy calculated by the density functional theory. This work provides the necessary information to explore the multifunctionality based on Aurivillius n-ABO3–BTO oxides.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 23 , 14 December 2012 , pp. 2956 - 2964
Copyright
Copyright © Materials Research Society 2012

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References

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