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Effect of milling on the structural, magnetic and catalytic properties of zinc ferrite synthesized by microwave combustion method

17th Edition of International Conference on Emerging Trends in Materials Science and Nanotechnology
April 26-27, 2018 Rome, Italy

Mohamed Housam Mahmoud

Al Jouf University, Saudi Arabia

Posters & Accepted Abstracts: Nano Res Appl

DOI: 10.21767/2471-9838-C1-009

Abstract

Zinc ferrite nano-crystals were successfully synthesized from its stoichiometric metal nitrates and glycine mixtures, using a microwave assisted combustion method. The as prepared sample was subjected to high energy ball milling for different periods of time. Structural and magnetic properties have been investigated by XRD, FTIR, VSM and Mössbauer spectroscopy. Results revealed that the as-prepared sample is a monophase zinc ferrite possesses high crystallinity. A minor of α-Fe2O3 phase is detected after milling. The average crystallite size of the as prepared (AP) ZnFe2O4 powder is about 27 nm. This value decreased with milling time reach to around 9 nm after 330 min. FTIR spectra showed two absorption bands in the zinc ferrite structure related to octahedral and tetrahedral sites in the range of 400-600 cm-1. The room temperature Mössbauer spectra of the samples are representing the coexistence of both ferrimagnetic ordering and superparamagnetic phases. The magnetic measurement at room temperature confirmed the ferrimagnetic behavior of the samples. The saturation magnetization value of the as prepared ZnFe2O4 is 47 emu/g was observed and its value decreased to 29 emu/g after 330 min of mill. The catalytic activity for the as prepared and milled samples was carried out using dehydrogenation – dehydration of isopropyl alcohol. The results revealed that the samples are active and highly selective towards the formation of acetone and propene. [email protected] [email protected]

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