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“showed a trend”

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With the increase in the content of Ba 0.6 Sr 0.4 TiO 3 NPs in the middle layer, the sandwich structure composites showed a trend of first increasing and then decreasing: One reason is that after the content of Ba 0.6 Sr 0.4 TiO 3 NPs exceeds 1 vol.%, the volume fraction of nanofillers may exceed the ideal percentage content that the polymer matrix can accommodate when the inorganic fillers are uniformly distributed.