Study of the temperature and organic bindings effects in the dielectric and structural properties of the lithium ferrite ceramic matrix (LiFe 5O 8)

• Published in: Journal of alloys and compounds Vol. 509; no. 39; pp. 9466 - 9471
• Main Authors: Costa, M.M., Sohn, R.S.T.M., Macêdo, A.A.M., Mazzetto, S.E., Graça, M.P.F., Sombra, A.S.B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 29.09.2011; Elsevier
• Subjects: Ceramic; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric loss and relaxation; Dielectric properties of solids and liquids; Dielectric spectroscopy; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Lithium ferrite; Magnetic material; Magnetic properties and materials; Permittivity (dielectric function); Physics; Studies of specific magnetic materials; Ceramic; Dielectric spectroscopy; Magnetic material; Lithium ferrite; Differential scanning calorimetry; Temperature dependence; Iron Lithium Oxides Mixed; Electrical properties; Dielectric properties; Thermogravimetry; Moessbauer spectroscopy; Vinyl alcohol copolymer; Calcination; XRD; Dielectric losses; Magnetic materials; PVA; Permittivity
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.07.038

► Organic bindings show that the bindings significantly alter the dielectric properties. In this study, the effects of the calcination temperature and of the organic bindings in the structural and dielectric properties of lithium ferrite (LiFe 5O 8) were investigated. The organic bindings used were glycerol, PVA (polyvinyl alcohol) and Galactomannan ( Adenanthera pavonina). The investigated calcination temperature range was from 773 K to 1073 K. The structural properties were analyzed using differential scanning calorimetry, thermogravimetry, X-ray diffraction and infra-red spectroscopy. The electrical and magnetical properties were investigated using impedance dielectric spectroscopy and Mössbauer spectroscopy. The study of the structural and electrical properties of the lithium ferrites is an important issue in view to their attractive technological properties and low cost of fabrication. This work shows that the binding type, affects significantly the dielectric constant and loss of the LiFe 5O 8 ceramics.