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Crystallographic features in the vicinity of the morphotropic phaseboundary in the multiferroic material Bi1-x SmxFeO3

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: [email protected])
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Abstract

The multiferroic material Bi1-x SmxFeO3 shows ferroelectric and antiferromagnetic properties inthe ground state of the Bi-rich side. When the Sm content increases fromx = 0 in BiFeO3, the (ferroelectric-R3c→ paraelectric-Pnma) state change occurs around x= 0.14. According to the previous studies onBi1-x SmxFeO3, the state boundary between the R3c and Pnma states can beidentified as a morphotropic phase boundary (MPB), which is nearly parallel tothe temperature axis in the state diagram. The notable feature ofBi1-x SmxFeO3 is that a remarkable piezoelectric response was also foundnear the MPB. However, the origin of the remarkable response has not beenunderstood sufficiently. In this study, thus, the crystallographic features inthe vicinity of the MPB have been examined by x-ray powder diffraction andtransmission electron microscopy. It was confirmed that the R3c and Pnma stateswere present for 0 ≤ x ≤ 0.15 and for0.16 ≤ x ≤ 0.30, respectively. Inaddition to these states, there also existed the PbZrO3-type statearound x = 0.15, which was identified as a modulatedstructure. Based on the analysis of the modulated structure, furthermore, it wassuggested 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 1/20]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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