Unleaded piezoelectric ceramic consisting of B-site composite Bi-based compound and preparation method thereof
A lead-free piezoelectric and compound technology is applied in the field of piezoelectric ceramic materials, which can solve the problems of unreported B-site composite Bi, and achieve the effects of improving composition uniformity, simple preparation process and excellent piezoelectric performance.
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Embodiment 1
[0026] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x =0.03, y =0.80, v =0.10, z =0.01, Me=Nb, M=Dy. Lead-free piezoelectric ceramics composed of B-site composite Bi-based compounds
[0027] The preparation method comprises the following steps:
[0028] To analyze pure Bi 2 o 3 、Na 2 CO 3 、BaCO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、Dy 2 o 3 and TiO 2 as raw materials, respectively according to the following chemical formula:
[0029] Bi (Li 1 / 2 Nb 1 / 2 )O 3 , BaTiO 3 , (Na 1 / 2 Bi 1 / 2 )TiO 3 , (K 1 / 2 Bi 1 / 2 )TiO 3
[0030] For batching, use absolute ethanol as a medium for high-energy ball milling for 10 hours, dry at 80°C, and then hold at 750°C for 2 hours to pre-synthesize Bi (Li 1 / 2 Nb 1 / 2 )O 3 , pre-synthesized BaTiO at 950°C for 2 hours 3 , pre-synthesized at 850°C for 2 hours (Na 1 / 2 Bi 1 / 2 )TiO 3 , pre-synthesi...
Embodiment 2
[0036] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x =0.03, y =0.08, v =0.85, z =0.01, Me=60%Nb+40%Sb, M=In. B-site composite Bi-based compound composed of lead-free piezoelectric ceramics
[0037] The preparation method is the same as in Example 1, the sintering temperature is 1100°C, and the hot pressing sintering temperature is 680°C.
[0038] The performance measurements are as follows:
[0039] d 33 (pC / N) Q m k p ε r tanδ(%) k t 114 198 0.18 755 4.43 0.16
Embodiment 3
[0041] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x=0.88, y =0.03, v =0.06, z =0.01, Me=90%Nb+10%Sb, M=Ce. B-site composite Bi-based compound composed of lead-free piezoelectric ceramics
[0042] The preparation method is the same as in Example 1, the sintering temperature is 1200°C, the holding time is 6 hours, the hot pressing sintering temperature is 750°C, and the holding time is 30 minutes.
[0043] The performance measurements are as follows:
[0044] d 33 (pC / N) Q m k p ε r tanδ(%) k t 185 206 0.26 942 1.78 0.36
PUM
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