Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

Crystals

Motohiro Ogino²  Yuji Noguchi²  Yuuki Kitanaka²  Masaru Miyayama²  Chikako Moriyoshi¹ 

[1] Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan; E-Mails:;Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan; E-Mails:

关键词: ferroelectric crystals;    bismuth sodium titanate;    BNT;    spontaneous polarization;    X-ray diffraction;    synchrotron radiation X-ray diffraction;    DFT;    monoclinic;    rhombohedral;   

DOI  :  10.3390/cryst4030273

来源: mdpi

【 摘 要 】

The features of the crystal structures and spontaneous polarization (P_s) under an electric field (E) have been reviewed for (1 − x)(Bi_0.5Na_0.5)TiO₃–xBaTiO₃ (BNT–BT). In-situ measurements of high-resolution synchrotron radiation X-ray diffraction (SR-XRD) under electric fields show that single crystals with x = 0 (BNT) and 5% have a monoclinic distortion in space group Cc at 25 °C. The SR-XRD study combined with density functional theory (DFT) calculations demonstrates that BNT–5%BT exhibits a rotation of P_s in the monoclinic a–c plane by 2° under an E of 70 kV/cm along the <001> pseudo-cubic direction, which is much larger than BNT.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.