Maestría en Física Aplicada (tesis)
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Examinando Maestría en Física Aplicada (tesis) por Autor "Gallo Castrillón, Wilson Henry"
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Ítem Caracterización de Materiales Ferroeléctricos en Frecuencias de Microondas(Universidad EAFIT, 2019) Gallo Castrillón, Wilson Henry; Marulanda Bernal, José Ignacio;71696211This dissertation aims at the implementation of a technique of dielectric characterization of ferroelectric ceramic materials at microwave frequencies, to measure dielectric constant and loss tangent associated with the propagation of electromagnetic waves (Tan δ) with frequencies up to 8.5 GHz. For the characterization of the ferroelectric materials, the coatings were synthesized by spin-coating technique and then a gradual heat treatment was avoid cracking during the drying process. For this, sputtering techniques (RF magnetron sputtering) were explored using Barium Titanate targets (BaTiO3) and Strontium Titanate (SrTiO3) at 99.99% (manufacturer); Chemical solution (Sol-Gel) techniques of ferroelectric materials deposited on a metallized alumina substrates. The films obtained were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDS). The technique of dielectric characterization implemented as part of this work consists of depositing the material to be analyzed on a coplanar waveguide resonator circuit (CPW). The dielectric constant and its loss tangent can be determined from the frequency response of the resonator coated with the sample material. The obtained results confirm the synthesis of Barium Titanate with cubic structure, with homogeneous distribution on surfaces and few surface defects on metallized alumina substrates. The dielectric characterization shows a relative dielectric constant 𝜀𝑟≈20, a very promising result. However, the tangent of losses despite not reporting optimal levels (Tan δ ≈0.001), these adjust to results reported in studies of similar characteristics.