Journal
BULLETIN OF MATERIALS SCIENCE
Volume 44, Issue 2, Pages -Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12034-021-02389-3
Keywords
BNT; (Mn1 3Nb2 3)(4+); phase transition; piezoelectric; strain
Categories
Funding
- National Natural Science Foundation of China [11664006, 61965007]
- Guangxi Natural Science Foundation [2018GXNSFDA281042]
- Innovation Project of GUET Graduate Education [2018YJCX81]
- Guangxi Key Laboratory of Information Materials [191023-Z]
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Doping Mn can significantly reduce the grain size of ceramics and change their phase structure and electrical properties, transforming them from a ferroelectric phase to a relaxor phase. Moreover, with the increase of Mn content, the piezoelectric response gradually increases.
The complex ions (Mn1/3Nb2/3)(4+) doped 0.82BNT-0.18BKT (BNKT-xMN) ceramics were prepared by conventional solid-state sintering. The effects of the MN content on the structural and electrical properties of the BNKT-xMN ceramics were investigated. The grain size decreases sharply after doping MN. With the increase of the MN content, the phase structure changes from the rhombohedral and tetragonal phase to the tetragonal phase, then to the pseudo-cubic phase. The ferroelectric phase transforms to the relaxor phase. At critical phase (x = 0.03), the maximum positive bipolar strain and unipolar strain are 0.38 and 0.386%, respectively. The corresponding d33 and d(33) are 767 pm V-1 and 158 pC N-1, respectively. Meanwhile, the dielectric constant gradually decreases with the increase of the MN content, which flattens the permittivity curves. The large piezoelectric responses are closely associated with the reversible relaxor-ferroelectric phase transformation.
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