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- W2012342023 abstract "Nickel-Zinc ferrites of nominal composition Ni0.3Zn0.7Fe2O4 were prepared with small deviations from stoichiometry by standard ceramic powder processing. Ferritisation was carried out in the range 800–1100°C and the progress was studied by X-ray diffractograms. For the final selected material ferritisation was done at 850°C. The ground ferritised material with a particle size of about 0.1 micron was compacted into pellets for densification and microstructure studies, and toroids for magnetic studies under identical compaction pressures. Pellets and toroids were packed in fireclay saggars with Ni-Zn ferrite powder of similar composition to avoid loss of Zn at sintering temperatures. Firing was done in silicon carbide tube furnace at 1150, 1170, 1200, 1250 and 1300°C for 5, 20 and 100 hrs. Bulk density and porosity were determined and microstructure analysis was made on polished and etched specimens of fired pellets. Grain size and pore size distributions were determined from optical micrographs. Maximum fired density was 5 gm/cc (theoretical 5.345 gm/cc) and the highest temperature and times of firing resulted in reduced final density. Average sample grain sizes ranged between 7 micron and 43 micron. Exaggerated grain size of about 80 micron was also observed in high fired samples. Trapped pores resulted in almost all samples." @default.
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- W2012342023 date "1977-01-01" @default.
- W2012342023 modified "2023-09-25" @default.
- W2012342023 title "Effect of Processing Parameters on Microstructure Development and Magnetic Spectrum of Ni0.3Zn0.7Fe2O4Ferrite: I—Ferritisation and Microstructure Development" @default.
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- W2012342023 doi "https://doi.org/10.1080/0371750x.1977.10840642" @default.
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