Preparation of laminates based on Bi4Ti3O12 (BIT) by tape casting and lamination process - dielectric, magnetic and structural characterization

Reference Presenter Authors
08-038 Ana Paula da Silva Peres Peres, A.P.(Universidade Federal do Rio Grande do Norte); Costa, A.C.(Federal University of Rio Grande do Norte); Acchar, W.(Federal University of Rio Grande do Norte); Correa, M.A.(Federal University of Rio Grande do Norte); Paskocimas, C.A.(Universidade Federal do Rio Grande do Norte); The discovery of novel materials and the exploration of their properties has provided the development and optimization of a wide range of technological devices in the recent decades. In this context, the production of ferroelectric thin films has allowed noticeable advances to the development of miniaturized non-volatile ferroelectric memory device. Bismuth titanate, Bi4Ti3O12, known as BIT, has been widely used in a number of applications, such as high temperature piezoelectric, memory storage, among others. In recent years, the molding tape method has been gaining a lot of attention, it allows a production of thin films, plans of high specific area, in addition to enabling the thickness control. The process basically consists of forming a slurry from ceramic powders, solvents, binders, plasticizers and other additives such as antifoam, surfactant and dispersant. This process, combined with the lamination procedure, enable us to produce multilayers of ceramic materials. In turn, the multilayer geometry becomes an interesting route to tailor the structural, dielectric and magnetic properties. We produce multilayers of BIT ceramic tapes by aqueous tape casting combined with laminating process. We focus on samples laminated with 1 up to 5 layers, and investigate the structural, dielectric and magnetic properties of the green and sintered multilayers. Peaks related to the Bi4Ti3O12 phases are found in the precursor powder andin the ceramic multilayers. Modifications of the dielectric behavior are verified with increasing number of layers,as well as before and after the sintering. Ferromagnetic features are observed for the green multilayers, while a single paramagnetic behavior is found for the sintered ones. These results provide interesting insights to tailor the electrical and magnetic properties of the multilayers of BIT ceramic tapes, placing them as a promising material fulfilling the needs of different specific technological applications.
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