Grain size induced monoclinic (Cm) to rhombohedral (R3c) transformation in sodium potassium bismuth titanate ceramics

SCRIPTA MATERIALIA

卷:141

Article

Babu, M. Veera Gajendra¹  Bagyalakshmi, B.¹  Padiyan, D. Pathinettam¹  Ren, Y.²  Sundarakannan, B.¹ 

[1] Manonmaniam Sundaranar Univ, Dept Phys, Tirunelveli 627012, India

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Sintering;    Synchrotron radiation;    Piezoelectric ceramics;    Piezoelectricity;   

DOI  :  10.1016/j.scriptamat.2017.07.022

来源: Elsevier

【 摘 要 】

Grain size effect on structure, remnant polarization and piezoelectric constant of lead-free Na0.4K0.1Bi0.5 TiO3 ceramics with grain sizes of 0.58, 0.85, 1.19 and 1.83 pm was investigated. Synchrotron X-ray diffraction in combination with Rietveld refinement was used to examine the structural changes. We have reported an existence of monoclinic (Cm) phase at room temperature and discussed the grain size (1.83 -> 0.58 mu m) induced structural transformation (Cm -> R3c) through both intrinsic polarization rotation and adaptive phase theory. Polarization vector in the (1 (1) over bar0)(pc) monoclinic plane rotates towards [111](pc) with the reduction of grain size. Better domain alignment and large polar variants results enhanced remnant polarization and piezoelectric constant in 1.83 mu m sample. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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