Polymorphic phase transition and piezoelectric properties of (Ba1−xCax)(Ti0.9Zr0.1)O3 lead-free ceramics

Enhanced piezoelectric properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 lead-free ceramics by optimizing calcination and sintering temperature

“…13,15 The grain size is much larger than 10 m, while the grain size of other lead-free piezoelectric ceramic systems such as BNT and KNN systems is only 3 m. 23,24 That is because the sintering temperature is high enough for the grain growth of the BCTZ systems, while for BNT or KNN system, the sintering temperature is usually just adequate for densification due to the volatilization of Bi 2 O 3 , K 2 O and Na 2 O at higher temperature. Generally speaking, the calcined powders with the same composition of ceramics are used as supporting powders for ceramic pellets when being sintered.…”

“…The newly discovered lead-free BCTZ ceramics by Liu and Ren 9 have attracted great attention [10][11][12][13][14][15] due to the excellent piezoelectric properties (with d 33 = 500-600 pC/N). The highest d 33 of these literatures is only 350 pC/N, which is far inferior to that of Liu's report.…”

Structure and phase transitions in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) from −100 °C to 150 °C

“…3 The parent phase BaTiO 3 has an intermediate orthorhombic phase at temperatures between the tetragonal and rhombohedral phases, a fact which has also motivated reports that 50BZT-50BCT is mixed-phase rhombohedral and orthorhombic at room temperature. 4,5 However, no orthorhombic crystallographic model has yet been shown to describe the data. 4,5 Property measurements also suggest the possibility of extra phase transitions, in addition to the expected cubic-tetragonal and tetragonal-rhombohedral transitions for 50BZT-50BCT.…”

“…4,5 However, no orthorhombic crystallographic model has yet been shown to describe the data. 4,5 Property measurements also suggest the possibility of extra phase transitions, in addition to the expected cubic-tetragonal and tetragonal-rhombohedral transitions for 50BZT-50BCT. For example, Benabdallah et al 6 observed peaks in the pyroelectric current at 93 °C, 25 °C and -3 °C, and Damjanovic et al 7 reported anomalies in dielectric and elastic 4 properties at approximately 90 °C, 34 °C, 8 °C and -60 °C ( Fig.…”

Effects of Mn-doping on the properties of (Ba0.92Ca0.08)(Ti0.95Zr0.05)O3 lead-free ceramics

“…However, the optimal composition of this ceramic with high d 33 values exhibits low Curie temperature (T C = 93°C). At present, there have been many reports about the (Ba,Ca)(Ti,Zr)O 3 (BCTZ) ceramics, but most of these ceramics exist low mechanical quality factor (Q m : 200-400) [5][6][7][8][9]12]. Consequently, the low T C and Q m of BCTZ ceramics are not suitable for practical piezoelectric application.…”