期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 4, 页码 1379-1386出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.11.023
关键词
BNT-ST bulk; Structure refinement; Weighted off-center; Rietveld method; X-ray and neutron diffraction
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0030058, 2011-0013876, 2013M2B2A4041506]
- Changwon National University
- National Research Foundation of Korea [2013M2B2A4041506, 2011-0013876, 2011-0030058] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The structure of lead-free (1-x)(Bi0.5Na0.5)TiO3-xSrTiO(3) (BNT-STx) ceramics was analyzed by the Rietveld method, using X-ray diffraction and neutron scattering data. The structural refinement results suggest that the crystal structure successively changes with SrTiO3 concentration, x, from the rhombohedral phase (x = 0.00) to rhombohedral and tetragonal (x = 0.10-0.30), tetragonal and cubic (x= 0.40-0.60), and finally cubic (x = 0.80-1.00) phases. Correlation between the charge sensor constant (d(33)) and the weighted off center value (d(w)) was observed, which may be attributed to the increased dipole motion in the unit cell due to an increased tendency to respond to external stimulation. Furthermore, an improved charge sensor constant (d(33)) of 140 pC/N was observed for BNT-ST0.20, and a large strain of 0.25% and a d(33)* value of 443 pm/V were observed from x = 0.30. (C) 2016 Published by Elsevier Ltd.
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