sciencedirect: Flash sintering improves magnetic properties of spinel zinc ferrite

 

Scripta Materialia

Volume 236, November 2023, 115681

Flash sintering improves magnetic properties of spinel zinc ferrite

Soumyadeep Sur, Parmanand Kumar Tyagi, Shikhar Krishn Jha

Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India

Received 11 June 2023, Revised 20 July 2023, Accepted 22 July 2023, Available online 28 July 2023, Version of Record 28 July 2023.

 

Abstract

We report on a simple protocol for one step synthesis and sintering of single-phase magnetic spinel ZnFe₂O₄ zinc ferrite (ZFO) using an electric field assisted sintering. The resultant materials show improved saturation magnetization and higher coercivity compared to conventionally sintered ferrite. The changes in properties have been attributed to generation of non-thermal lattice defects when processed under electric field. Instead of using the high temperatures (>1000 °C) and extended dwell periods (> 4 h) required by the traditional sintering processes, this method permits sintering of ZFO at a furnace temperature of only 950 °C in just a minute by applying a minimal field of 25 Vcm⁻¹. This magnetic material with decreased coercivity and increased saturation magnetization will improve the efficiency of solenoids, transformer/inductor cores, microwave devices and magnetic shields.

 

https://www.sciencedirect.com/science/article/pii/S1359646223004049