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Synthesis, processing and characterization of dielectric compounds exhibiting colossal permittivity

Grant number: 15/07316-9
Support type:Scholarships abroad - Research
Effective date (Start): January 04, 2016
Effective date (End): January 03, 2017
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal researcher:Everaldo Nassar Moreira
Grantee:Everaldo Nassar Moreira
Host: Juan Claudio Nino
Home Institution: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP). Campus São João da Boa Vista. São João da Boa Vista , SP, Brazil
Research place: University of Florida, Gainesville (UF), United States  


The colossal permittivity property has been attributed to materials that present, independent of frequency over a wide range of temperatures, a dielectric permittivity on several orders of magnitude greater than the solid dielectrics and low dissipation factor too. The development of these materials is much practical interest for use in microelectronics as super capacitors, or devices to store large amounts of energy. Several models have been proposed as a strategy to obtain these materials as well as trying to describe the phenomenon. Mechanisms of surface charges, grain boundary defects, localized dipoles, among others. However, there has been no consensus in the literature between the experimental results, models and ways of preparing these materials. This post-doctoral project aims to investigate the preparation methods and models proposed to explain the origin of colossal dielectric permittivity, noting if these apply to different ferroelectric compounds. The project will be developed in the Department of Materials Science and Engineering, University of Florida (Gainesville, USA), under the supervision of Professor Juan Claudio Nino, which develops interdisciplinary research in the field of ceramic materials (AU)

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