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Crystallographic features in the vicinity of the morphotropic phase boundary in the multiferroic material Bi1-xSmxFeO3

Published online by Cambridge University Press:  24 February 2016

Masashi Nomoto ,
Takumi Inoshita ,
Yasuhide Inoue ,
Yoichi Horibe  and
Yasumasa Koyama
Masashi Nomoto*
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Takumi Inoshita
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
Yasuhide Inoue
Affiliation:
Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
Yoichi Horibe
Affiliation:
Department of Materials Science and Engineering, Kyushu Institute of Technology, Sensui, Tobata-ku, Kitakyushu, Fukuoka, 804-8550, Japan
Yasumasa Koyama
Affiliation:
Department of Electronic and Physical System, Waseda University, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
*
*(Email: masashi.2292@ruri.waseda.jp)
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Abstract

The multiferroic material Bi1-xSmxFeO3 shows ferroelectric and antiferromagnetic properties in the ground state of the Bi-rich side. When the Sm content increases from x = 0 in BiFeO3, the (ferroelectric-R3c → paraelectric-Pnma) state change occurs around x = 0.14. According to the previous studies on Bi1-xSmxFeO3, the state boundary between the R3c and Pnma states can be identified as a morphotropic phase boundary (MPB), which is nearly parallel to the temperature axis in the state diagram. The notable feature of Bi1-xSmxFeO3 is that a remarkable piezoelectric response was also found near the MPB. However, the origin of the remarkable response has not been understood sufficiently. In this study, thus, the crystallographic features in the vicinity of the MPB have been examined by x-ray powder diffraction and transmission electron microscopy. It was confirmed that the R3c and Pnma states were present for 0 ≤ x ≤ 0.15 and for 0.16 ≤ x ≤ 0.30, respectively. In addition to these states, there also existed the PbZrO3-type state around x = 0.15, which was identified as a modulated structure. Based on the analysis of the modulated structure, furthermore, it was suggested that the PbZrO3-type state could be regarded as a 2q state, which is characterized by two transverse modulation waves with k1 = [1/2 0 0]o and k2 = [0 1/2 0]o in the orthorhombic-Pnma notation.

Keywords

transmission electron microscopy (TEM)oxidecrystallographic structure
Type
Articles
Information
MRS Advances , Volume 1 , Issue 9: Electronics and Photonics , 2016 , pp. 573 - 578
Copyright
Copyright © Materials Research Society 2016 

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References

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