Palavras-chave: Ferrita de chumbo; Microestrutura; Fase Líquida; Propriedades magnéticas; Efeito Jahn-Teller. ABSTRACT. This paper presents to obtain a. O efeito de borda, graças às influência de grupos polarizáveis (RR’ N-) no final da transições eletrônicas, degenerescência, efeito Jahn-Teller, entre outros. Recentemente, tem estendido seu interesse de pesquisa em aplicações do Efeito Jahn-Teller em sistemas triatômicos e compostos inorgânicos de estrutura .
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Investigation of the magnetic properties and microstructure of lead and copper ferrite. The objectives of this work were to obtain a lead and copper ferrite with spinel structure, characterizing the microstructure and the determination of their magnetic properties. The copper and lead ferrite is a material with low magnetic coercivity, high electrical resistivity and high magnetic permeability.
The structural, microstructural and magnetic characterizations were performed using the techniques of X-ray diffraction, scanning electron microscopy, vibrating egeito magnetometer, and magnetic thermal gravimetric analysis.
The results showed that samples are formed exclusively by the tetragonal spinel structure. Hysteresis loops show the characteristics of a soft magnetic material and the saturation magnetization increased with the lead concentration. The value of the Curie temperature decreased with increasing lead concentration.
O refinamento das estruturas cristalinas foram teloer utilizando o software FullProff.
Temperature dependence of the magnetization for the different samples. Segundo Torquato et al. Micrographs of sintered samples. Nikam, “Synthesis and characterization of nano-crystalline Cu and Pb”, Sens.
Transducers11 Craik, “Magnetic Materials”, Willey Interscience Heck, “Magnetic Materials and their Applications”, Butterworth Saha, “Structural and magnetic properties of Li-Cu mixed spinel ferrites”, Phys.
(Investigation of the magnetic properties and microstructure of lead and copper ferrite)
Orgel, “Eletronic proprietes of transition metal oxides: Distortions from cubic symmetry”, J. Solids 3 Ghose, “Phase Transition studies on copper ferrite”, Mater.
Liang, “Preparation, structure and catalytic properties of magnetically separable Cu-Fe catalysts for glycerol hydrogenolysis”, J. Tang, “Photocatalytic activity evaluation of tetragonal CuFe 2 O 4 nanoparticles for the H 2 evolution under visible light irradiation, J. Lei, “Mechanism of oxygen releasing of copper ferrite in the formation of the corresponding oxygen-deficient compound”, Sci.
Laboratório de Química Computacional
China Series B 52, 1 Mazen, “Tetravalent ions substitution in Cu-ferrite, structure formation and electrical properties”, Mater. Naseem, “Influence of Pb doping on structural, electrical and magnetic properties of Srhexaferrites”, J. King Saud University Eng. John, “Effect on magnetic properties of zinc doped nano ferrites synthesized by precursor or method”, Int.
Mohammadpour, “Effect of copper substitution on structural and magnetic properties of NiZn ferrite nanopowders”, J. Rehman, “Effect of Pb on structural and magnetic propertiesof Ba-hexaferrite”, Phys.
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Rezlescu, “Microstructure and magnetic and electrical properties of low-temperature sintering Ni-Zn, Li-Zn and Mg-Zn-Cu ferrites without and with addition of lead oxide”, J. Hakim, “Structural phase transformation and hysteresis behavior of Cu-Zn ferrites”, Int.
Xu, “Magnetic anisotropy and Mossbauer spectra in disordered lithium-zinc”, J. Hakim, “Magnetic ordering in Ni-Cd ferrite”, J. Hakim, “Magnetic properties of cadmium substituted lithium”, Mater.
Gajbhiye, “Mossbauer studies and magnetic properties of spinel lead ferrite”, Hyperfine Interact. Services on Demand Journal.
Abstract The objectives of this work were to obtain a lead and copper ferrite with spinel structure, characterizing the microstructure and the determination of efeigo magnetic properties. How to cite this article.