A systematic study of physical properties of La substituted Sr3Co2Fe24O41 Z-hexaferrites

Investigation of the Structural, Dielectric, Magnetic, and Magnetoelectric Properties of Nd-Substituted Sr3Co2Fe24O41 Z-Hexaferrite

“…17,18 In addition, no additional peaks of unreacted starting components have been observed, which implies a well mixing of all reactant materials. However, as pointed out by Singh et al 27 , here also, few peaks are found to have greater intensity than that reported for pure SCFO, which might be attributed to the presence of additional phases and the preferred orientation of some planes, notably between 30 and 36°. The crystallite size of SCFO was found to be 22.6 nm.…”

“…As stated above, in the present case, no structural change is visible from the peak positions of Nd-substituted SCFO ( x < 0.45), however, for samples with Nd substitution, the onset of the structural changes appears clearly in the XRD pattern. 27 In addition, it has also been observed from the Rietveld refinement studies that (within the constraints mentioned above) the obtained fraction of the Z-hexagonal ferrite phase in SCFO is a significant phase and prevails over an additional phase i.e., W-phase.…”

“…However, the intensity of peaks varies with Nd-substitution. The lattice parameters corresponding to the pristine sample were obtained in our previous report on Lasubstituted SCFO, 27 where only two phases, i.e., W and Zhexaferrite, were used during the Rietveld refinement of the XRD data. Hence, in the present case too, while performing the Rietveld refinement of the lightly doped sample, i.e., for x < 0.3, Z & Wphases were used (though the value of goodness of fit, χ 2 remain high, which may be due to noisy background and preferred orientation) and the variation in the lattice parameters as compared with that of pristine seems to be very small.…”

“…Given our previous studies on La-substituted Z-Hexaferrites, the maximum limit of Nd substitution has been set to 15% of a fraction of the total Sr atom in the formula unit, i.e., x = 0.45 because anything above this value may result in a significant structural change. 27 Therefore, to comprehend the consequences of Nd replacement in SCFO, x values were chosen to be within the range where the structure of Nd substituted samples seems comparable to that of the pristine sample.…”

“…21,24 In this context, it is further submitted that only a few reports have been published on the substitution of rare Earth metals (like La, Nd, Smetc) in Z-type Hexaferrites (BCFO/SCFO). 10,22,[25][26][27] For instance, Singh et al 27 and Xu 28 23 Gd-Tb, 29 Nd 30 and Dy 31 on Ba 3 Co 2 Fe 24 O 41 (as parent compound) has been reported in the available literature. However, to the best of our knowledge, the influence of rare Earth substitution on Sr 3 Co 2 Fe 24 O 41 (SCFO) has not yet been studied in detail.…”