Comportamento elétrico e magnético da cerâmica Ni-Zn
Electric and magnetic behavior of Ni-Zn ceramic
Valesca Donizeti de Oliveira, Claudiney de Sales Pereira Mendonça, Manuel Ribeiro da Silva, Rero Marques Rubinger, Adhimar Flávio Oliveira, Vander Alkmin dos Santos Ribeiro
Resumo
As ferritas receberam um renovado interesse tecnológico e científico nos últimos anos, devido ao seu baixo custo de produção e à diversidade de aplicações. As ferritas de níquel-zinco são bem conhecidas como materiais magnéticos moles com boas propriedades, tais como alta resistividade elétrica, baixa perda de corrente parasita em altas frequências e propriedades de aquecimento por indução em um campo magnético alternado (a.c.). Elas são amplamente utilizadas em diversos produtos industriais, como transformadores de potência, micro-ondas e equipamentos de telecomunicações. Amostras de ferritas de níquel-zinco (Nix Zn1-xFe2 O4 , com x = 0,00, 0,25, 0,50, 0,75, 1,00) foram sinterizadas a 1250 °C por 20h usando o método de reação de estado-sólido. A estrutura cúbica de espinélio foi a microestrutura encontrada na série de ferritas Ni-Zn. A estrutura do sistema espinélio misto foi investigada com difração de raios X. As propriedades magnéticas foram caracterizadas com um magnetômetro de amostra vibrante, pelo qual foi obtida a curva de magnetização em função do campo magnético aplicado. A condutividade elétrica DC das pastilhas cilíndricas foi caracterizada com variação da temperatura de 30 °C a 550 °C. Os resultados da caracterização elétrica mostram que as ferritas de níquel-zinco produzidas apresentam características semicondutoras.
Palavras-chave
Abstract
Ferrites have received a renewed technological and scientific interest in recent years, due to their low cost of production and the diversity of applications. Nickel-zinc ferrites are well known as soft magnetic materials with good properties, such as high electrical resistivity, low loss of eddy current at high frequencies and induction heating properties in an alternating magnetic field (a.c.). They are widely used in various industrial products, such as power transformers, microwaves and telecommunications equipment. Samples of nickel-zinc ferrites (Nix Zn1-xFe2 O4 , with x = 0.00, 0.25, 0.50, 0.75, 1.00) were sintered at 1250 °C for 20h using the state reaction method -solid. The spinel cubic structure was the microstructure found in the Ni-Zn ferrite series. The structure of the mixed spinel system was investigated with X-ray diffraction. The magnetic properties were characterized with a vibrating sample magnetometer, by which the magnetization curve was obtained as a function of the applied magnetic field. The DC electrical conductivity of cylindrical pallets was characterized with temperature variation from 30 °C to 550 °C. The results of the electrical characterization show that the nickel-zinc ferrites produced have semiconductor characteristics.
Keywords
References
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Submitted date:
10/10/2019
Accepted date:
07/21/2021
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