Open AccessLarge electro-strain signal of the BNT–BT–KNN lead-free piezoelectric ceramics with CuO doping
Author(s) -
Zhihao Zhao,
Rui-Fang Ge,
Yejing Dai
Publication year - 2019
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x1950022x
Subject(s) - materials science , ceramic , piezoelectricity , doping , condensed matter physics , phase transition , state (computer science) , strain (injury) , physics , thermodynamics , mathematics , composite material , algorithm , medicine
This paper investigates a system of 0.93[Formula: see text][Formula: see text]TiO 3 –0.06BaTiO 3 –0.01[Formula: see text][Formula: see text]NbO 3 –[Formula: see text]CuO (BNT–BT–KNN–[Formula: see text]CuO, [Formula: see text][Formula: see text]mol.%) ceramics, which were fabricated by the conventional solid-state process through the granulation of vacuum freeze drier. The results show that the CuO doping made a significant enhancement on the piezoelectric properties of the BNT–BT–KNN ceramics. With the doping of CuO, the transition temperature between ferroelectric phase and ergodic relaxor state is reduced to near room temperature, resulting in pinched [Formula: see text]–[Formula: see text] loops and “sprout” shape [Formula: see text]–[Formula: see text] curves. For the composition with [Formula: see text], a high unipolar strain of 0.39% under 5[Formula: see text]kV/mm contributes a large [Formula: see text][Formula: see text]pm/V at room temperature, which is competitive with the other BNT-based ceramics.