Crystal Field Parameters
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Synthesis and Characterization of Non-Linear Optical Crystal of Manganese Mercury Thiocyanate Glycol Monomethyl Ether
The design and synthesis of organic nonlinear optical (NLO) crystals are a promising area of current research in materials science. Organic materials are found to possess better non linear optical properties when compared to inorganic materials. Recently, there has been a widespread interest in the metal-organic coordination compounds, which are a combinatio
Mat. Res.. Publicado em: 30/11/2017
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2. Sodium Chloride Crystallization by Electric Discharge in Brine
Electrical discharges in liquids are currently used to synthesize nanoparticles. The plasma-liquid interaction is complex, where parameters such as electric field, ion charges and other species present are important. In order to understand the mechanism of crystallization, mother liquor (saturated solution of NaCl, MgCl2 and KCl) was used to study the effect
Mat. Res.. Publicado em: 06/07/2017
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3. SYSTEMATIC STUDY OF CRYSTAL FIELD PARAMETERS IN COMPLEX ION EU3 +. / ESTUDO SISTEMÁTICO DE PARÂMETROS DE CAMPO CRISTALINO EM COMPLEXOS DE ÍONS EU3+.
Neste trabalho foram utilizados e comparados dois modelos e um método, a fim de estipular a melhor maneira de descrever as propriedades espectroscópicas dos complexos contendo íons Ln3+, a saber, o modelo eletrostático de cargas pontuais (PCEM), o modelo de recobrimento simples (SOM) e o método dos vizinhos equivalentes (MENN). Foram previstos parâmetr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2012
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4. Spectroscopies of photoluminescence and excitation of MgGa2O4 samples doped with Mn2+. / Espectroscopia de fotoluminescência e excitação de amostras MgGa2O4 dopadas com Mn2+
This work presents the room temperature photoluminescence and excitation spectroscopes data of MgGa2O4 samples doped with 0.5% and 10.0% Mn2+. The polycrystalline samples were produced by solid-state reaction at high temperature and characterized with X ray Diffraction and SEM. The photoluminescence spectra showed emission at green and red spectral regions,
Publicado em: 2009
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5. Doping phase diagrams of the heavy fermions Ce2MIn8 (M = Rh, IR) / Efeitos da substituição quimica nos diagramas de fases dos fermions pesados Ce2MIn8 (M = Rh e Ir)
This thesis describes the investigation of the physical properties of the (Cd, Sn, Ga)-doped Ce2MIn8 (M = Rh, Ir) intermetallic compounds. Temperature dependent magnetic susceptibility, heat capacity and electrical resistivity measurements were performed to characterize the macroscopic properties of the synthesized compounds. X-ray powder diffraction were us
Publicado em: 2009
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6. Desenvolvimento de um sistema de aquisiÃÃo e armazenamento de dados microcontrolado
The data acquisition systems are present in many studies, cooperating on collection, storage and analyses of data. On farming field, these systems are used in experiments of agricultural machines, soil characteristics study, as well as in other applications where data collection by sensors is needed. In the present study, a data acquisition system was develo
Publicado em: 2009
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7. Nanofibras de carbono verticalmente alinhadas:: estudo do crescimento por microscopia eletrônica de transmissão
This work is about the growth of vertically aligned Carbon Nanofibers - CNFs - grown by Plasma Enhanced Chemical Vapour Deposition - PECVD. Being so, a detailed study of catalyst particle is necessary and Transmission Electron Microscopy - TEM - is fundamental for this knowledge. Some analytical techniques associated to TEM were used: Bright and Dark Field I
Publicado em: 2008
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8. Optical properties of tetrahedal Fe3+ in ceramic sample / Propriedades ópticas do Fe3+ tetraédrico em matriz cerâmica
The aim of this work was the production and investigation of a Fe3+- doped sample. The experimental methods were X-ray diffraction, photoluminescence and photoacoustic spectroscopies. From X-ray results, the formed phases in the sample were identified. By using optical data, the excited and fundamental energy levels, the energy crystal field and Racah parame
Publicado em: 2007
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9. Fluid insertion related processes for sensing using photonic crystal fibers / Processos relacionados a inserção de fluidos para sensoriamento com fibras de cristal fotonico
This work presents studies of how to insert fluids (liquid and gas) into microstructured optical fibers, especially photonic crystal fibers, also known as PCF?s. These optical fibers possess air holes that run along its entire length. They can be divided into two major groups: solid core fibers that guide light by total internal reflection and hollow core fi
Publicado em: 2007
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10. Caracteristicas da poeira do processo de fabricação de materiais ceramicos para revestimento : estudo no polo de Santa Gertrudes / Characteristics of dust from the manufacturing process of ceramic materials for tiles : study in the Santa Gertrudes complex
Dust generated in the process of manufacturing ceramic materials may be a hazardous agent to the health of workers, especially when silica polymorphs in crystal forms of ?-quartz and cristobalite are present in its composition. Occupational exposure to respirable dust of such polymorphs may lead to the onset of lung disease named silicosis and other associat
Publicado em: 2007
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11. Characterization of Cs2NaAIF6:Cr3+ and Cs2NaGaF6:Fe3+ single crystals by electron paramagnetic resonance / Caracterização dos monocristais Cs2NaAIF6:Cr3+ e Cs2NaGaF6:Fe3+ por meio de ressonancia paramagnetica eletronica
The interest in materials with large bands of absorption and luminescence is due to the possibility of their applications as tunable solid state lasers. The crystals Cs2NaAlF6:Cr3+ and Cs2NaGaF6:Fe3+ present these properties and , naturally, some of their physical characteristics, such as the crystal field , are decisive for their optical activity and should
Publicado em: 2006
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12. Adenylosuccinate Lyase from Leishmania major Friedlin and its role in the purine nucleotides salvage pathway / Adenylosuccinato lyase (ADSL) de leishmania major friedlin: sua relevância na via de recuperação de purino-nucleotídeos
Many species of Leishmania are responsible for serious visceral or skin diseases that exhibit high incidence in tropical and subtropical regions. The drugs currently employed in the treatment of parasitic diseases are potentially carcinogenic, often require prolonged treatment and patient hospitalization. An effective program of drug design requires the vali
Publicado em: 2006