Piezoelectric ceramic complexes
A technology of piezoelectric ceramics and composites, applied in circuits, piezoelectric/electrostrictive/magnetostrictive devices, electrical components, etc., to achieve the effect of small dielectric constant-temperature coefficient and high temperature stability
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Embodiment 1
[0026] CaCO 3 , SrCO 3 、 Bi 2 o 3 、TiO 2 (analytical pure) as raw material, according to Sr 2-x Ca x Bi 4 Ti 5 o 18 Stoichiometric weighing, according to the conventional solid-phase synthesis method for batching, ball milling and mixing for 4 hours, drying, 850 ° C heat preservation for 2 hours pre-synthesis, fine grinding, drying, adding binder, molding, plastic discharge (850 ° C, time 2 hours), sintering at 1160°C for 2 hours, and the bismuth layered ceramic composite with the above formula is formed. Its main performance parameters are listed in Table 1. It can be seen from Table 1 that the samples composed around x=1 have higher comprehensive performance.
[0027] Table 1: (Sr 2-x Ca x ) Bi 4 Ti 5 o 18 Typical properties of samples
[0028] x 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Density (g / cm 3 ) 6.50 6.53 6.51 6.42 6.4 6.31 6.35 6.33 % theoretical density 90 91 91 91 91 90 91 92 ε 33 T (100kHz) 390 280 300 ...
Embodiment 2
[0030] Take the composition of x=1, y=0.1-0.4, and add different contents of MnCO in it 3 The sintering temperature is 1150° C., and the others are the same as in Example 1, and the properties are listed in Table 2.
[0031] Table 2: Performance of samples after doping (x=1)
[0032] y 0.1 0.2 0.3 0.4 Density (g / cm 3 ) 6.53 6.50 6.49 6.40 % theoretical density 91 90 91 89 ε 33 T (100kHz) 174 240 215 190 tanδ(100kHz) 0.015 0.01 0.01 0.01 Curie temperature T C
(℃)
572
670
721
650
coercive field
E. c (kV / cm)
60
52
52
52
remanent polarization
2P r (μC / cm 2 ) 18
16
17
14
Piezoelectric constant d 33 18 17 15 15
[0033] figure 1 It is a typical X-ray diffraction (XRD) spectrum of the high-temperature, high-frequency piezoelectric ceramic compound proposed by the present invention. It can be seen from this th...
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