RT info:eu-repo/semantics/bachelorThesis
T1 Composite ferroelectrics for recyclable energy harvesting and sensing applications - plastic crystal matrix and ceramic perovskite particles
A1 Pedraza de Frutos, Lucía
A2 Universidad de Valladolid. Facultad de Ciencias
K1 Material ferroeléctrico
K1 Cristal plástico
K1 Cerámica
AB Ferroelectric materials are critical components in nearly all our wireless communication technologies, used in applications such as sensors or antennas. However, state-of-the-art materials are limited to metal oxides or polymers (Polyvinylidene Fluoride (PVDF)) and are not recyclable. This work involved obtaining a composite ferroelectric from a plastic crystal (TMA FBC) matrix, synthesized in the laboratory using different evaporation and condensation methods, together with perovskite BaTiO3 particles. For this process, pressed pellets were formed at high temperatures using fixed compositions of 10, 30 and 50 % in volume for the BaTiO3. The characterization of the properties of both, the precursor materials and the final composites was carried out using analytical methods including X-ray diffraction, SEM imaging, high-voltage ferroelectric testing and dielectric impedance measurements. It was observed that the plastic crystal synthesis was challenging to obtain one single phase, as it required two crystallization processes within the process. The main interest lies in studying how the ferroelectric and dielectric properties of this new material change as a function of the composition. The results showed that the materials exhibit adequate ferroelectric behaviour, with strain values and ferroelectric and dielectric parameters changing as the composition varied, improving when the ceramic presence was higher. Tests revealed that the pellet containing 30 % of BaTiO3 in volume, had the lowest dielectric permittivity (ϵ′) and dielectric loss (tan(δ)), so it may be interesting depending on the desired applications.
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/74193
UL https://uvadoc.uva.es/handle/10324/74193
LA eng
NO Departamento de Química Física y Química Inorgánica
DS UVaDOC
RD 19-jul-2025