Piezoelectric properties of high Curie temperature barium titanate–bismuth perovskite-type oxide system ceramics

Abstract

Barium titanate ͑BaTiO 3 , BT͒-bismuth magnesium titanium oxide ͓Bi͑Mg 0.5 Ti 0.5 ͒O 3 , BMT͔ system ceramics were prepared in an ambient atmosphere in order to increase the Curie temperature ͑T c ͒ of BT above 132°C. A single perovskite phase was observed for BT-BMT ceramics with BMT compositions less than 50 mol %, and their relative densities were greater than 94%. Synchrotron measured x-ray diffraction patterns revealed that all the cations in the ceramics were homogeneously distributed. The temperature dependence of the dielectric properties revealed that the BT-BMT system ceramics exhibited relaxorlike characteristics with a dielectric maximum temperature as high as 360°C for the 0.5BT-0.5BMT ceramic. The apparent piezoelectric constant ͑d ‫ء‬ ͒ was 60 pC/N for the 0.4BT-0.6BMT ceramic. Based upon these results, the BT-BMT system shows potential as a new type of lead-free material for high T c piezoelectric applications.

Structural phase boundary of BiFeO3–Bi(Zn1/2Ti1/2)O3–BaTiO3 lead-free ceramics and their piezoelectric properties

“…As the state-of-art review discussed, [2][3][4] compositional and structural engineering approaches to achieve enhanced piezoelectric properties in lead-free materials are being focused on K 1-x Na x NbO 3 , (1-x) (Bi 0.5 (Na,K) 0.5 )TiO 3 -xBaTiO 3 3 have been intensively studied and exhibit good piezoelectricity, these leadfree ceramics exhibit a poor temperature stability of piezoelectric properties due to low Curie temperature (T C ) [2][3][4][5][6][7][8][9]. To improve temperature stability of piezoelectric performance, novel piezoceramics with higher T C and no ferroelectric-ferroelectric (FE-FE) phase transition below T C are required [10][11][12][13][14][15].…”

Structure, piezoelectric, and ferroelectric properties of BaZrO3 substituted Bi(Mg1/2Ti1/2)O3-PbTiO3 perovskite

“…The addition of BaZrO 3 could reduce the tetragonality that will improve the domain mobility to raise the piezoelectric properties. Furthermore, the dielectric spectrum of Ba-based piezoelectric ceramics [11][12][13] exhibits that the ceramics possess relaxor character at the MPB compositions, and the dielectric loss is lower at high temperature, which could improve the resistance of piezoelectric ceramics at high temperature.…”

Effect of sintering condition and V-doping on the piezoelectric properties of BaTiO₃–Bi(Mg_1/2Ti_1/2)O₃–BiFeO₃ ceramics

“…Microstructure and electric properties have been studied for lead-free piezoelectric solid-solutions of relaxor-like (1 ¹ x)-BaTiO 3 xBi(Mg 1/2 Ti 1/2 )O 3 (BTBMT) with the dielectric maximum temperature maximized to 360°C at x = 0.5 19), 20) and ferroelectric BiFeO 3 (BF) with the Curie temperature of ³830°C.…”