. . . "RIV/68378271:_____/13:00394535!RIV14-AV0-68378271" . . "spinel ferrite; in-field M\u00F6ssbauer spectroscopy; sol-gel method; nanocomposite"@en . "The Co(1_x)NixFe2O4/SiO2 (x = 0.0,0.2,0.4,0.6,0.8,1.0) nanocomposites were prepared using the sol\u2013gel method and characterized by Powder X-ray Diffraction (PXRD), M\u00F6ssbauer spectroscopy and magnetic measurements. The PXRD measurements confirmed the presence of the spinel phase in all samples with particle diameters varying between 15 and 24 nm. The ZFC and FC measurements of the magnetization showed that the blocking temperature is well above the room temperature for all samples. Both the coercivity and the saturation magnetization decrease linearly with increasing content of the Ni2+ ions. The room temperature M\u00F6ssbauer spectra exhibit a sextet with asymmetric lines indicating a different crystal environment for the Fe3+ ions. By application of the external magnetic field at 4.2 K, these overlapped sextets split up allowing determination of the ratio of the Fe3+(Oh)/Fe3+(Td). The obtained results are discussed considering influence of the Ni doping." . "RIV/68378271:_____/13:00394535" . "334" . . "0304-8853" . . . "10.1016/j.jmmm.2013.01.005" . "The Co(1_x)NixFe2O4/SiO2 (x = 0.0,0.2,0.4,0.6,0.8,1.0) nanocomposites were prepared using the sol\u2013gel method and characterized by Powder X-ray Diffraction (PXRD), M\u00F6ssbauer spectroscopy and magnetic measurements. The PXRD measurements confirmed the presence of the spinel phase in all samples with particle diameters varying between 15 and 24 nm. The ZFC and FC measurements of the magnetization showed that the blocking temperature is well above the room temperature for all samples. Both the coercivity and the saturation magnetization decrease linearly with increasing content of the Ni2+ ions. The room temperature M\u00F6ssbauer spectra exhibit a sextet with asymmetric lines indicating a different crystal environment for the Fe3+ ions. By application of the external magnetic field at 4.2 K, these overlapped sextets split up allowing determination of the ratio of the Fe3+(Oh)/Fe3+(Td). The obtained results are discussed considering influence of the Ni doping."@en . . "I, P(GAP108/10/1250), P(LM2011025), Z(MSM0021620834)" . "Journal of Magnetism and Magnetic Materials" . . "67140" . "2"^^ . . "5"^^ . "Correlation of crystal structure and magnetic properties of Co(1-x)NixFe2O4/SiO2 nanocomposites" . "Kub\u00ED\u010Dkov\u00E1, Simona" . . . "Holec, Petr" . "4"^^ . "000315744100017" . "NL - Nizozemsko" . "Ni\u017E\u0148ansk\u00FD, D." . "MAY" . "Correlation of crystal structure and magnetic properties of Co(1-x)NixFe2O4/SiO2 nanocomposites"@en . . "Correlation of crystal structure and magnetic properties of Co(1-x)NixFe2O4/SiO2 nanocomposites" . . . . . . "Vejpravov\u00E1, Jana" . . "Correlation of crystal structure and magnetic properties of Co(1-x)NixFe2O4/SiO2 nanocomposites"@en . . . "[392A8F1D4667]" . .