Mössbauer, magnetic and microwave absorption characteristics of substituted W-type hexaferrites nanoparticles

W-type hexaferrite nanoparticles of nominal composition BaCo2−xMnxFe16−2yZryNiyO27 (x = 0–0.5; y = 0–1.0), are synthesized by using the chemical co-precipitation technique. The X-ray diffraction (XRD) data conform to the formation of single phase. Mössbauer analysis reveals that extrinsic substitution of metal ions (Mnx and Zry–Niy) takes place at 2d, fIV, 2b, and 12k sub-lattices. Doped metal substitution up to ionic contents of x = 0.3 and y = 0.6, results in enhancement of the saturation magnetization Ms and remanent magnetization Mr while these substitutions lower the coercivity Hc. The optimum values of the above mentioned three parameters, measured at room temperature, using a vibrating sample magnetometer (VSM), are 79.7 emu g−1, 36.0 emu g−1 and 1012 Oe, respectively. Microwave absorption characteristics calculated from complex permeability and complex permittivity data retrieved by a vector network analyzer (VNA) increase as the doped metal ions content increases.