Nanocrystalline magnetic alloys and ceramics

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

“…Thereby, the sample containing single-domain structure is predicted to exhibit SPM. A critical size for domains is attributed [24] in nano Ni-Zn ferrites, where and about the phenomena of SPM occurs with in the observed D range of *(6-20) nm. In an earlier report [21] of Sb 5?…”

“…A wide variety of routes of preparation for the nanophased ferrites, such as sol-gel [23], co-precipitation [24], micro emulsion technique [25] and micro induced combustion technique [26] are reported. The samples synthesized by sol-gel, co-precipitation and microwave induced combustion method [24][25][26] are generally found [27] to provide the yield in amorphous state.…”

“…The samples synthesized by sol-gel, co-precipitation and microwave induced combustion method [24][25][26] are generally found [27] to provide the yield in amorphous state. Hence, they require further heat treatment to induce crystallization.…”

Coprecipitation of nickel zinc malonate: A facile and reproducible synthesis route for Ni1−Zn O nanoparticles and Ni1−Zn O/ZnO nanocomposites via pyrolysis

“…The presence of new atoms in the crystal structure of pure metal oxide semiconductors can modify the position of the Fermi level and hence change the electrical properties of the resulting materials. For the synthesis of mixed metal oxide systems, several methods such as electrospinning [9,10], sol-gel [11][12][13], hydrothermal [14,15], plasma assisted route [16], high-temperature solid-state reaction [17], coprecipitation [18][19][20][21][22] have been employed. Among these methods, co-precipitation offers several advantages over the other methods: good dispersion of the constituent oxides, low operating temperatures, low cost and good control of stoichiometry.…”

Pursuing the Crystallization of Mono- and Polymetallic Nanosized Crystalline Inorganic Compounds by Low-Temperature Wet-Chemistry and Colloidal Routes

“…In conclusion, within the framework of nanostructures synthesis, liquid-phase synthetic routes are generally considered a more promising alternative to solid-state approaches such as the ceramic method and ball-milling (mechanosynthesis) method, − as these latter are rather crude and energy-consuming top-down approaches. Conversely, liquid-phase synthesis allows a finer and more direct control over the reaction pathways on a molecular level during the synthetic process itself.…”