期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 7, 页码 2310-2317出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.02.008
关键词
BNKSTNx ceramics; Phase structures; P-E loops; Strain response; Dielectric properties
资金
- National Natural Science Foundation of China [51672311]
- Science and Technology Project of Hunan Province, China [2016WK2022]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
In this work, the crystalline phase, domain structure, and electrical properties of [Bi-0.5(Na0.84K0.16)(0.5)](0.96)Sr0.04Ti1-xNbxO3 (x = 0.010-0.030) ceramics are investigated. Increasing the Nb content induces the phase transition from coexistent rhombohedral and tetragonal phases to a single pseudo-cubic phase, and the lamellar ferroelectric domains evolve into polar nanoregions. Decreased ferroelectric-to-relaxor transition temperature and enhanced frequency dispersion are found in the temperature-dependent dielectric constant and loss, implying a transition from the non-ergodic to ergodic relaxor state. The Nb substitution significantly degrades the long-range ferroelectric order with sharply decreased piezoelectric coefficients from -140 to -1 pC/N. However, a large strain of 0.32% at 5 kV/mm (normalized strain of 640 pm/V) is obtained around the critical composition of x = 0.0225. The composition of x = 0.030 shows good temperature insensitivity of the strain response, characterized by 308 pm/V with less than 15% reduction from 25 degrees C to 125 degrees C.
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