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The advantages of ultra-small manganese-zinc ferrite nanoparticles are manifold and can be exploited in a wide range of applications. Here we show that ultra-small, highly crystalline Mn-Zn ferrite nanoparticles with variable composition can be obtained by non-aqueous sol-gel synthesis in a facile, scalable process. The growth of Mn 0.6 Zn 0.4 Fe 2 O 4 nanoparticles has been investigated exemplarily for a series of Mn-Zn ferrites. It is thereby shown that the initially formed ultra-small 2 nm sized particles grow via oriented attachment into shamrock-like shaped particles, and clusters with an ordered structure are formed during synthesis. Throughout the synthesis the crystallinity of the particles improves until after 24 h of synthesis highly crystalline, monodisperse nanostructures with a size of around 6 nm are obtained. Further on the influence of the chemical as well as physical properties of the ultra-small Mn (1-x) Zn x Fe 2 O 4 nanoparticles with 0 ≤ x ≤ 1 on their Curie temperature was evaluated. It is shown that by variation of the Mn/Zn ratio the Curie temperature of the particles can be tailored in a broad range from 200 to 400 • C.

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