supplement

See the supplementary material for the XRD patterns, the strain constant and particle size, the Mӧssbauer spectra, the permittivity, the permeability, the 1st FMR frequency versus the sintering time, the magnetic and dielectric tangent loss, the attenuation factor, RL of the other samples, and the table of the (Zn2+, Sn4+) ions' occupation.