Abstract
Strontium hexaferrite nanoparticles are prepared by the chemical sol–gel route. Specific saturation magnetization σ s and coercive field strength H c are determined depending on the heat treatment of the gel and iron/strontium ratio in the starting solution. These ultrafine powders with single-domain behavior have specific saturation magnetization σ s=74 emu/g and coercive field strength H c=6.4 kOe. Experimental results show that it is necessary to preheat the gel between 400 and 500°C for several hours . It can prevent the formation of intermediate γ-Fe 2O 3 and help to obtain ultrafine strontium ferrite single phase with narrow size distribution at a low annealing temperature. Additionally, the magnetic properties of sol–gel derived strontium ferrite with iron substituted by Zn 2+, Ti 4+ and Ir 4+ are discussed. For an amount of substitution 0< x⩽0.6, the (Zn, Ti) x substituted strontium ferrite shows higher values of both coercive field strength and saturation magnetization than the (Zn, Ir) x substituted phase.
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