A lead-free piezoelectric ceramic material with low conductance and large strain and its preparation method
A ceramic material, lead-free piezoelectric technology, applied in the field of lead-free piezoelectric ceramic material and its preparation, tungsten-doped bismuth ferrite barium titanate ceramic material and its preparation field, can solve the problem of ferroelectricity disappearance, electric strain Value reduction and other issues, to achieve the effect of large conductance
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Embodiment 1
[0040] The preparation composition is (Bi 0.67 Ba 0.33 )(Fe 0.67-x W x Ti 0.33 )O 3+δ , wherein, the lead-free piezoelectric ceramic material with low conductance and large strain of x=0.005, the preparation method is as follows:
[0041] To analyze pure Bi 2 o 3 、BaCO 3 , Fe 2 o 3 、TiO 2 , and WO 3 As a raw material, according to the chemical formula (Bi 0.67 Ba 0.33 )(Fe 0.665 W 0.005 Ti 0.33 )O 3+δ Raw materials are weighed in the proportion of each element. Deionized water and agate balls are used as the medium, mixed according to the ratio of raw materials: agate balls: deionized water = 1:1.5:1.2, and wet ball milled for 12 hours. After drying, the raw material powder is compacted, heated to 800°C at a rate of 2°C / min and held for 5 hours to synthesize, and then cooled to room temperature with the furnace; the synthesized green body is crushed, and dried after 24 hours of ball milling , add 5.5wt% polyvinyl alcohol (PVA) to granulate, mix evenly and pa...
Embodiment 2
[0044] The preparation composition is (Bi 0.67 Ba 0.33 )(Fe 0.67-x W x Ti 0.33 )O 3+δ , wherein, x=0.01 lead-free piezoelectric ceramic material with low conductance and large strain, its preparation method is the same as that of Example 1.
[0045] The hysteresis loop of the lead-free piezoelectric ceramics prepared in Example 2 is as follows figure 1 As shown, the remanent polarization strength of ceramics after quenching is changed from 4.6μC / cm 2 Increased to 22.0μC / cm 2 , the ferroelectric performance is significantly improved. The unipolar strain curve of the lead-free piezoelectric ceramics prepared in Example 2 is as follows figure 2 As shown, the ceramic unipolar strain after quenching treatment is increased from 0.065% to 0.250%, and the unipolar strain is increased by 47%. The graph of conductance versus temperature and the value of unipolar electro-induced strain are shown as image 3 and 4 shown. The prepared piezoelectric ceramics have a conductance ...
Embodiment 3
[0047] The preparation composition is (Bi 0.67 Ba 0.33 )(Fe 0.67-x W x Ti 0.33 )O 3+δ , wherein, x=0.02 lead-free piezoelectric ceramic material with low conductance and large strain, its preparation method is the same as that in Example 1.
[0048] The conductance of the prepared lead-free piezoelectric ceramics varies with temperature and the value of unipolar electric strain is as follows: image 3 and 4 shown. The prepared piezoelectric ceramics have a conductance of 1.3×10 at 300°C -6 Scm -1 , the unipolar strain is 0.19%, and undoped and unquenched (Bi 0.67 Ba 0.33 )(Fe 0.67 Ti 0.33 )O 3 Compared with piezoelectric ceramic materials, the conductance is reduced by more than one order of magnitude, the unipolar strain is increased by 12%, and the comprehensive performance is significantly improved.
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