Synthesis by the modified polymeric precursor method and characterization of barium-doped bismuth ferrite

• Grant number: 16/22350-1
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): January 01, 2017
• Effective date (End): December 31, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal researcher: Ruth Herta Goldschmidt Aliaga Kiminami
• Grantee: Ariane Vilca Suarez
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

Multiferroic materials have a high potential for application in the field of electronics. Bismuth ferrite, BiFeO3, is a single-phase material that presents both ferroelectric and magnetic properties at room temperature, thus offering new possibilities for data storage devices. In addition to providing a new alternative for the manufacture of lead-free ferroelectric materials, it is environmentally friendly, thus attracting the attention of the scientific community in recent years. However, a major difficulty in BiFeO3 synthesis and processing is to prevent the formation of different Bi-Fe-O oxides, which are considered secondary phases that degrade the material's magnetoelectric behavior. Several papers in recent years have reported that the magnetoelectric properties of BiFeO3 are augmented in response to the substitution of some Bi+3 sites, as a result of the decrease in secondary phase formation. Therefore, the objective of this research is to obtain Bi(1-x)BaxFeO3 (x=0, 0.1, 0.15, 0.2, 0.25 mol) powders by the microwave-assisted polymeric precursor method. The variables inherent to the synthesis process, such as pH of the solution, type of chelating agents, radiation time (microwave) and calcining temperature will be studied. The results will be analyzed according to the synthesis conditions required to obtain the desired phase, aiming at future applications for the material's magnetoelectric properties. Therefore, the scholarship holder will become familiar with the chemical synthesis route and the various basic ceramic powder characterization techniques such as BET, XRD, DTA/TG, SEM and TEM, as well as the analysis of the effect of Ba+2 substitution on the microstructure and magnetic properties of BiFeO3. (AU)