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a Location of adjacent introducing element in periodic table of the elements. b Average ε′ and ε′′ value of CoNi@C and CoNiM@C. c Real and d imaginary part of permittivity, e tan δe, and f attenuation constant of CoNiM@C microspheres. g, h HRTEM image and i, j strain distribution images along the Exx and Eyy directions. k Holography image, l reconstructed phase image and m profile of charge density along the direction of white arrow in i
