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Temperature Stability of Lead‐Free Niobate Piezoceramics with Engineered Morphotropic Phase Boundary
Author(s) -
Wang Ruiping,
Wang Ke,
Yao Fangzhou,
Li JingFeng,
Schader Florian H.,
Webber Kyle G.,
Jo Wook,
Rödel Jürgen
Publication year - 2015
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.13604
Subject(s) - phase boundary , materials science , electromechanical coupling coefficient , piezoelectricity , piezoelectric coefficient , temperature coefficient , tetragonal crystal system , analytical chemistry (journal) , phase (matter) , natural bond orbital , mineralogy , chemistry , composite material , organic chemistry , chromatography , density functional theory , computational chemistry
The temperature dependence of piezoelectric properties (direct piezoelectric coefficient d 33 , converse piezoelectric coefficient d 33 ( E = 0), strain S and electromechanical coupling coefficient k p ) for two niobate‐based lead‐free piezoceramics have been contrasted. 0.92(Na 0.5 K 0.5 )NbO 3 –0.02(Bi 1/2 Li 1/2 )TiO 3 –0.06BaZrO 3 (6 BZ /2 BLT /92 NKN ) has a morphotropic phase boundary ( MPB ) between rhombohedral and tetragonal at room temperature and 0.92(Na 0.5 K 0.5 )NbO 3 –0.03(Bi 1/2 Li 1/2 )TiO 3 –0.05BaZrO 3 (5 BZ /3 BLT /92 NKN ) features an MPB engineered to be located below room temperature. At 30°C, d 33 , d 33 ( E = 0), S (at 2 kV/mm), and k p are 252 pC/N, 230 pm/V, 0.069%, 0.51 for 5 BZ /3 BLT /92 NKN ; and 348 pC/N, 380 pm/V, 0.106%, 0.57 for 6 BZ /2 BLT /92 NKN , respectively. With increasing temperature, the piezoelectric properties decrease. At 200°C, d 33 , d 33 ( E = 0), S (at 2 kV/mm), and k p are 170 pC/N, 160 pm/V, 0.059%, 0.36 for 5 BZ /3 BLT /92 NKN ; and 181 pC/N, 190 pm/V, 0.061%, 0.39 for 6 BZ /2 BLT /92 NKN . It is found that the electromechanical coupling coefficient has a better temperature stability than the piezoelectric coefficient in the studied system due to a large temperature‐dependent compliance change. The results demonstrate that engineering an MPB is highly effective in tailoring temperature stability of piezoceramics.