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NaNbO 3 ‐BaTiO 3 ‐NaSbO 3 lead and potassium‐free ceramics with thermally stable small‐signal piezoelectric properties
Author(s) -
Qi He,
Zhang Haibo,
Zuo Ruzhong
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14944
Subject(s) - materials science , phase boundary , ceramic , piezoelectricity , tetragonal crystal system , ferroelectricity , microstructure , dielectric , phase (matter) , perovskite (structure) , mineralogy , potassium niobate , atmospheric temperature range , analytical chemistry (journal) , solid solution , grain boundary , crystal structure , crystallography , composite material , thermodynamics , metallurgy , optoelectronics , chemistry , physics , organic chemistry , chromatography
A new lead‐potassium‐free ceramic of (0.9‐ x )NaNbO 3 ‐0.1BaTiO 3 ‐ xNaSbO 3 ( NN ‐ BT ‐ xNS ) was successfully prepared via a solid‐state reaction method. The microstructure, phase structure, dielectric, ferroelectric, and piezoelectric properties were investigated as a function of NS content. The substitution of NS for NN was found to dramatically change the grain morphology from cube‐like grains typical for alkaline niobate‐based ceramics to conventional sphere‐like grains especially for Pb‐based perovskite ceramics. A normal to relaxor ferroelectric phase transformation was accompanied by a tetragonal ( T ) to rhombohedral ( R ) phase transition. A composition‐temperature phase diagram demonstrated a vertical morphotropic phase boundary between T and R phases in the composition range of x =0.03‐0.04, where optimum electrical properties of d 33 =252 pC/N, k p =36%, Q m =168,ϵ 33 T / ϵ 0 =2063, and T c =109°C were obtained in the x =0.035 ceramic sintered at 1260°C. Particularly, excellent temperature insensitivity of small‐signal piezoelectric properties suggested large application potentials in various actuators and sensors in comparison with other typical lead‐free materials.