Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 1, Pages 35-41Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.07.014
Keywords
Lead-free; Piezoelectrics; Bismuth sodium potassium titanate ceramics; Strain; Phase transition
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012R1A1A2005922]
- Mid-career Researcher Program through NRF
- MEST [2011-0016790]
- National Research Foundation of Korea [21A20131100002, 2011-0016790, 2012R1A1A2005922] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A suite of Nb-based piezoelectric ceramics of 0.99[Bi-0.5(Na0.4K0.1)(Ti1-xNbx)]O-3-0.01(Ba0.7Sr0.3)TiO3(BNKTN-BST), with x ranging from 0 to 0.030, was prepared by a conventional solid-state reaction method. X-ray diffraction patterns confirmed a single perovskite phase and the tetragonality was found to decrease with increasing Nb ratio. The BNKTN-BST ceramic had a high field-induced normalized strain coefficient of 634 pm/V at 2 mol% Nb content with a relatively small hysteresis compared with existing lead-free Bi-perovskite ceramics. An electric-field-dependent X-ray study was conducted to identify the main source of the high strain and ascertain the effect of electric fields on the crystal structure. The temperature-dependent P - E hysteresis loops of the BNKTN-BST ceramics were measured under an electric field of 60 kV/cm at various temperatures, and the effect of temperature on the ferroelectricity is discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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