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Multiferroic Bi4Ti3O12-nBiFeO3 (n= 1-5) crystals by pulling down technique

Hideo Kimura 1,  Hongyang Zhao 1,2,  Rumi Tanahashi 1,  Lei Guo 1,  Qiwen Yao 3,  Zhenxiang Cheng 3,  Xiaolin Wang 3,  Zengmei Wang 4

1. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
3. University of Wollongong, Wollongong NSW, Australia
4. Southeast University (SEU), Nanjing 210000, China

Abstract

Aurivillius phase bismuth layer-structured materials with the formula of (Bi2O2)2+ (Am-1BmO3m+1)2- are expected an amazing variety of both structural and physical properties by changing the A and B cations as well as the number of perovskite-like units (m). In recent years, number of paper is increased on those Aurivillius compounds with m=4, 5 or more complicated one.

In this paper, we report the crystal growth of these oxides compound; Bi5Ti3FeO15 (BTFO) (m=4); i.e., Bi4Ti3O12-nBiFeO3 (n= 1-5). BTFO crystallizes in the polar space group A21am at room temperature. However, the structure of Bi4Ti3O12- nBiFeO3 (n= 2-5) compound are not so clear. In these cases, smaller Fe ions are also incorporated into B (Ti) sites, which may cause new magnetically ordered structures.

BTFO starting ceramics were synthesized by conventional solid state method. The crystals were grown by our original floating-zone pulling down (Fz-PD) method. 

In the past papers, we succeeded to grow long single crystals using modified pulling down method on Rb (Cs), Na: KNbO3 series single crystals [1, 2]. This system is installed conventional double ellipsoidal mirror halogen lamps and Pt tube in 4 mm diameter. At least single-phase crystals could be grown in the present. At past time, no rotation of Pt wire is necessary to grow on single crystals on Rb (Cs), Na: KNbO3 series. On the other hand in the present, the rotation of Pt wire is necessary to grow single crystals in long size due to keeping good temperature conditions. We believe the difference on the rotation is up to molten zone properties. But in this paper, we don’t treat the molten zone properties. We focus on crystal properties only. Thus Characterizations were carried out for electric properties, such as dielectric constant and impedance etc. 

Part of this work was supported by GRENE (Green Network of Excellence) project from Ministry of Education, Culture, Sports, Science and Technology- Japan. 

[1] H.Kimura, R.Tanahashi, H.Y.Zhao, K.Maiwa, Cryst.Res.Technol. 46(1) (2011) 37.

[2] H.Kimura, R.Tanahashi, H.Y.Zhao, Q.W.Yao, Z.X.Cheng, X.L.Wang, Ceram. Int. 38S, (2012) S109.

 

 

 

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Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, Topical Session 2, by Hideo Kimura
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-03-29 00:15
Revised:   2013-03-29 00:52