Ferroelectricity
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Ba-DOPED ZnO MATERIALS: A DFT SIMULATION TO INVESTIGATE THE DOPING EFFECT ON FERROELECTRICITY
ZnO is a semiconductor material largely employed in the development of several electronic and optical devices due to its unique electronic, optical, piezo-, ferroelectric and structural properties. This study evaluates the properties of Ba-doped wurtzite-ZnO using quantum mechanical simulations based on the Density Functional Theory (DFT) allied to hybrid fu
Quím. Nova. Publicado em: 2016-04
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2. Efeito de metais de transição sobre a polarização espontânea na estrutura cristalina de nanopós da família tungstênio bronze
This work aimed the study of the effect of transition metals (Ni, Fe, Co) on the spontaneous polarization of the ferroelectric oxides of tetragonal tungsten bronze (TTB)-type structure of potassium strontium niobate (KSr2Nb5O15) and of the KSr2(FeNb4)O15-d, KSr2(NiNb4)O15-d and KSr2(CoNb4)O15-d solid solutions. All systems investigated were prepared by mecha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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3. Determination of the biaxially stretched PVDF ferroelectric polarization using constant current technique. / Determinação da polarização ferroelétrica do PVDF estirado biaxialmente utilizando a técnica de corrente constante.
Foi desenvolvido um novo método para a determinação da polarização ferroelétrica de polímeros ferroelétricos, em particular do PVDF estirado biaxialmente. A técnica consiste em manter constante a corrente através da amostra e medir a evolução da tensão (V versus t) entre os eletrodos da mesma. As medidas foram realizadas em ambiente com atmosfer
Publicado em: 1998
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4. Caracterização de propriedades fisicas de um material ceramico ferroeletrico do sistema PZT
In this work some fundamental aspects on piezoelectricity and ferroelectricity of materials are commented. Several types of characterization methods are used to study a PZT-like material which is commercially produced in Brazil. Microstructure and domain patterns are revealed by chemical etching and observed by optical microscopy and electron scanning micros
Publicado em: 1991
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5. Novo triodo corona e sua aplicação no estudo das propriedades elétricas do polímero pvdf. / New corona triode and application at the study of electrical properties of pvdf polymer.
This work describes a corona triode setup which allows charging thin dielectric films with a constant current and the simultaneous measurement of the sample surface potential. The charge current is kept constant by controlling the gride voltage, from which the sample potential is also derived. With the experimental setup we were able to obtain charging curre
Publicado em: 1990