Effect of Calcination Temperature on Microstructure and Microwave Absorbing Property of Ni_0.5Zn_0.5Fe₂O₄ Micro/Nanofibers

Abstract:

The Ni_0.5Zn_0.5Fe₂O₄/PVP composite micro/nanofibers with average diameters of around 300~500nm were prepared by sol-gel method combined with electrospinning technology. The influences of the calcination temperatures (800°C, 900°C, 1100°C) on the crystal structure, micromorphology and microwave absorbing property of the calcined products were characterized by means of XRD, FT-IR, SEM and vector network analyzer. The results showed that the pure spinel structure of Ni_0.5Zn_0.5Fe₂O₄ were all formed when the composite micro/nanofibers were calcined at above 800°C. With the increase of calcination temperature, the Ni_0.5Zn_0.5Fe₂O₄ grains gradually grown up which contained in the micro/nanofibers, and the micro/nanofiber morphology changed toward the bamboo-like structure, and eventually lost the fiber morphology and presented the irregular granlar forms. In the band of 2~18GHz, the minimum reflectivity of the products moved to high frequency gradually. The microwave absorbing property of the products after being calcinated at 800°Cwas better than being calcinated at 900°C and 1100°C.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 742-747
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.742
• Online since: March 2014
• Authors: Fang Zhao*, Jun Shou Li, Su Li, Ming Yuan Wang
• Keywords: Electro-Spinning, Micro/Nanofibers, Microwave Absorbing Property, Ni_0.5Zn_0.5Fe₂O₄

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