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. 2021 Sep 15;11:18342. doi: 10.1038/s41598-021-97684-8

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© The Author(s) 2021

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Graph of the ε^/ real part of permittivity (black line) and tg(α) loss tangent (grey line) vs. frequency at room temperature for the SFI-x samples with x = 0.1 (a), 0.3 (b), 0.6 (c) and 1.2 (d).