期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 16, 页码 4223-4233出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.05.044
关键词
Lead-free ceramics; Relaxor ferroelectric; Polar nanoregion; Strain
资金
- Ministry of Science and Technology of Taiwan [102-2221-E-131-006, 102-2221-E-146-001, 100-2112-M-030-002-MY3]
Structure, dielectric permittivity, strain, electric (E) polarization, and piezoelectric responses of (Bi1/2Na1/2)(0.925)Ba-0.075(Ti1-xZrx)O-3 (BNT7.5BT-100xZr; x= 0-0.04) ceramics were investigated as functions of poling E field and temperature. The BNT7.5BT ceramic reveals a phase transition from P4bm nanodomains to long-range-ordered P4mm domains. The Zr-doped BNT7.5BT ceramic reveals a reversible change of unit cell with dynamically fluctuating polar nanoregions, which are responsible for the large strain. The poled BNT7.5BT ceramic displays a depolarization temperature of T-d = 90 degrees C, which correspond to a phase transition from ferroelectric to relaxor states. The Zr-doped BNT7.5BT ceramics have Burns temperatures (TB) in the region of 400-435 degrees C, below which polar nanoregions begin to develop. The Zr-doped BNT7.5BT ceramics display wide diffuse phase transitions, suggesting a transition from R + T to T phases. BNT7.5BT-2Zr ceramic shows a temperature dependent linear large strain of 0.482% at 150 degrees C and can be a potential candidate for lead-free actuator. (C) 2014 Elsevier Ltd. All rights reserved.
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