Effect of an Electrostatic Field on Self-Propagating High-Temperature Synthesis of Manganese Ferrite

Abstract

Using the synthesis of manganese ferrite as an example, it is shown that an electric field causes a significant change in the parameters of heterogeneous combustion, depending on the field strength and application direction. The possible factors determining the end burning of the starting mixture in the applied electric field are considered.

Phase composition and magnetism of combustion products in Ba–Fe–O compounds synthesized under applied DC electric field

“…The full experimental procedure for combustion reactions under conditions of an applied non-contact electric field has been described earlier [11]. All reagents were obtained from the Russian chemical market and used as supplied.…”

“…Therefore the use of non-contact (capacitor) methods of electric field application during the combustion of SHS systems are very interesting. It has been reported previously that such method of application of an electrostatic field influences the kinetic characteristics and changes the maximum combustion temperatures in ferrite systems [11].…”

Influences of NiCO3 content on the microstructure and magnetic properties of Ni0.5Zn0.5Fe2O4 powders prepared by SHS

“…Ni-Zn ferrites are usually prepared by the solid state reaction method and wetchemical method. Recently, self-propagating high-temperature synthesis (SHS) preparation of ferrites, relying upon the exothermal heat released without external energy supply, has received increasing attention due to many potential advantages such as simple preparation, low processing cost, energy efficiency, and high production rate [3][4][5][6][7][8][9][10][11][12].…”

The influence of a dc electric field on chemical interactions in “peroxide-metal” systems during combustion processes

“…An external electric field (EEF) in a combustion process is the application of an external voltage across the system without inducing any direct heating effect. It has been shown [5][6][7] that the application of an EEF, E, during the combustion synthesis of ferrites leads to changes in the combustion process characteristics and product microstructure. This allows modification of the final product properties.…”

“…Also, for comparison, the influence of the EEF on the process and products of the interaction in a MnO 2 + 2Fe system (system II) were investigated with respect to the desired spinel manganese ferrite MnFe 2 O 4 . 6,7 The combustion process in system I took place in a steady regime with the recorded maximum combustion temperature T c = 1080 K and velocity U = 8 mm s À1 . The combustion wave was accompanied by a sparking bright orange gas flame.…”