Dielectric Anomalies
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Analysis of dielectric and electrical transport properties of NdFeAsO ceramic
Abstract The iron-based ceramic NdFeAsO was synthesized by the solid-state reaction method. The tetragonal crystal structure was confirmed at room temperature through the X-ray diffraction technique. The dielectric characteristics i.e. dielectric constant (εr) and loss tangent (tanδ) of the sample were studied at a wide range of temperature and frequencies
Cerâmica. Publicado em: 2022
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2. Dielectric study at microwave frequencies of phase transitions in multiferroic ceramics
Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and "normal" ferroelectric PbTiO3 (PT) - PFW-PT have been synthesized by a modified B-site precursor method and characterized by microwave dielectric measurements. A dielectric dispersion occurring in the frequency range of 100MHz-3GHz and in a broad range of tempera
Mat. Res.. Publicado em: 16/07/2013
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3. The density effect on grain boundaries in dielectric properties and dielectric anomalies of ferroelectric ceramics of BaTiO3. / Efeito da densidade dos contornos de grãos nas propriedades e anomalias dielétricas de cerâmicas ferroelétricas de BaTiO3
Neste trabalho, cerâmicas de BaTiO3 foram preparadas pelo método de Pechini com o propósito de estudar as suas propriedades dielétricas, incluindo as anomalias dielétricas de origem interfacial nestes ferroelétricos. Após calcinação das soluções precursoras a 600 oC por 2h, os pós compactados foram sinterizados a várias temperaturas entre 1150 e
Publicado em: 2009
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4. UM SISTEMA DE DIAGNÓSTICO DE EQUIPAMENTOS ELÉTRICOS DE ALTA TENSÃO COM BASE NA OCORRÊNCIA DE DESCARGAS PARCIAIS / A DIAGNOSTICS SYSTEM OF HIGH VOLTAGE POWER APPARATUS BASED IN PARTIAL DISCHARGES OCURRENCE
High voltage (HV) power apparatus are fundamental parts in the industrial process. It is also well Known that electrical insulation systems are the parts that present more problems through the life cycle of an HV apparatus. The dielectric properties of materials are altered during operation time and for this reason they should be monitored. Among the main an
Publicado em: 2001