With the gradual increase in the BaTiO 3 volume fraction, the d 33 value of the composite materials showed a gradual increase first and then a decreasing trend.
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A Study on the Effect of Conductive Particles on the Performance of Road-Suitable Barium Titanate/Polyvinylidene Fluoride Composite Materials.
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The sentences
With the increase in the BaTiO 3 volume fraction in the composite materials, the ε r value of BaTiO 3 /PVDF composite materials showed a trend of rapid increase followed by a sharp decrease.