Síntese e propriedades ferróicas do composto LuFe2O4

Abstract

In recent years, single-phased multiferroic magnetoelectric materials have attracted great interest from the scientific community because they present In recent years, single-phased multiferroic magnetoelectric materials have attracted great interest from the scientific community because they present more than one ferroic property. The LuFe2O4 is a very promising material because it has very attractive physical properties, including the giant dielectric tunability and the magnetodielectric effects at room temperature. In this study, we used the high-energy ball milling for processing polycrystalline LuFe2O4 samples, aiming to enhance the electrical and magnetic properties of the compound. The procedure to obtain ceramics was characterized by two distinct paths, where one starts from the calcined powders and the other uses the reactive sintering protocol. The structural and microstructural characterizations revealed the formation of single-phased materials in calcined powders. For ceramics, the results showed the presence of two spurious phases in small amounts. The electrical and magnetic properties of the samples had proved to be similar to those found in the literature for single crystals and polycrystals. However, some differences were observed in this study, such as a remnant magnetization and a coercive field smaller than those observed for single crystals. The ceramic sample showed a high electrical conductivity at temperatures above approximately 210 K due to the presence of spurious phases conductive.