Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites

Abstract

In this study, nanocrystalline ferrite powders with the composition Ni 0.5 Zn 0.5 Fe 2 O 4 were prepared by the autocombustion method. The obtained powders were sintered at 800 o C, 900 o C and 1,000 o C for 4 h in air atmosphere. The as-prepared and the sintered powders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and magnetization studies. An increase in the crystallite size and a slight decrease in the lattice constant with sintering temperature were observed, whereas microstrain was observed to be negative for all the samples. Two significant absorption bands in the wave number range of the 400 cm −1 to 600 cm −1 have been observed in the FT-IR spectra for all samples which is the distinctive feature of the spinel ferrites. The force constants were found to vary with sintering temperature, suggesting a cation redistribution and modification in the unit cell of the spinel. The M-H loops indicate smaller coercivity, which is the typical nature of the soft ferrites. The observed variation in the saturation magnetization and coercivity with sintering temperature has been attributed to the role of surface, inhomogeneous cation distribution, and increase in the crystallite size.

The Effect of Thermal Treatment on the Characteristics of Porous Ceramic-Based Natural Clay and Chitosan Biopolymer Precursors

“…Based on the Debye-Scherrer equation, shown in Table 2, the crystallite size of specimens decreased by the increasing sintering temperature from 900 to 1000 °C but increased homogenously at 1100 °C. This finding is different from the results of several previous studies, which revealed that the crystallite size increased with increasing sintering temperature with the same sintering temperature from 800 to 1000 °C [47,[49][50]. This anomalous behavior can be explained by assuming that a high defect concentration is produced during densification at 1000 °C; it can be attributed to the low crystallinity of the specimen at a sintering temperature of 1000 °C (Fig.…”

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

“…4 shows the correlation between crystallite size and microstrain; the smaller crystallite size, the microstructure increases. This is corresponded by Venkatesh et al [39], reported that the decrease in the FWHM of the diffraction peaks with sintering temperature, indicating an improvement in the crystallization process by elimination of defects such as voids or vacancies, crystallite growth, and crystallite coalescence.…”