Ferrite Materials: Introduction, Synthesis Techniques, and Applications as Sensors

TLDR

Ferrites possess porosity that provides humidity or gas adsorption sites, and sensor sensitivity depends on pore size. The review summarizes synthesis techniques, structures, classifications, uses, properties, and applications of ferrite materials in sensor fields. The authors performed morphological and structural studies of ferrite materials. The review discusses how sensitivity of CuFe₂O₄, CdFe₂O₄, and ZnFe₂O₄ sensors varies with temperature and gas concentration, and how resistivity–humidity characteristics of MgFe₂O₄ and Mg₀.₉Sn₀.₁Fe₂O₄ change with relative humidity. Keywords: spinel ferrites, magnetism, sensitivity, surface morphology, synthesis techniques, sensor; acknowledgments: Dr.

Abstract

ABSTRACT The present review summarizes, in a detailed introduction, the synthesis techniques, structures, classifications, uses, properties, and applications of ferrite materials in the fields of sensors. Morphological and structural studies of ferrite materials were performed. A great advantage of ferrites is their porosity, which is necessary for a sensor. These pores serve as humidity or gas adsorption sites and the sensitivity of sensor depends on the size of these pores. The variation in sensitivity with operating temperature at different concentrations of gas for sensing elements CuFe2O4, CdFe2O4, and ZnFe2O4 is discussed. In addition, resistivity–humidity a characteristic and sensitivity for the MgFe2O4 and Mg0.9Sn0.1Fe2O4 corresponding to different values of percentage of relative humidity is discussed. KEYWORDS: spinelferritesmagneticsensitivitysurface morphologysynthesis techniquessensor Acknowledgments Dr. Richa Srivastava is grateful to the University Grants Commission Delhi for a Post Doctoral Fellowship for Women, No. F.15-79/11 (SA-II).