Fluoride Glasses
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. MATERIAIS VÍTREOS E LUZ: PARTE 1
2015 is the Year of Light, according to UNESCO. Chemistry has a close relationship with light and one of the materials that allows such synergy is glass. Depending on the chemical composition of the glass, it is possible to achieve technological applications for the whole range of wavelengths extending from the region of the microwave to gamma rays. This div
Quím. Nova. Publicado em: 2016-04
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2. Crystallization in Lead Tungsten Fluorophosphate Glasses
The glass forming ability was investigated in the codoped Er3+/Yb3+ ternary system NaPO3-WO3-PbF2 with increasing amounts of PbF2. It has been found that glass samples can be obtained for PbF2 contents ranging from 0 mole% to 50 mole% for the codoped samples and an undoped sample containing 60% of lead fluoride could also be vitrified. Thermal properties of
Mat. Res.. Publicado em: 2015-02
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3. NEW ALTERNATIVE FOR REUSE HAZARDOUS WASTE FROM THE PRIMARY ALUMINUM PRODUCTION PROCESS (SPL): PRODUCTION OF THE OPAL GLASS AND FRITS / Nova alternativa para reaproveitamento do resíduo perigoso gerado na produção de alumínio primário (SPL): obtenção de vidros opacos e fritas.
The solid waste from deteriorated linings of cells in the aluminum metal production is called spent pot lining or SPL. Because of the presence of leachable cyanide and fluoride compounds the SPL is classified by internationals standards and the Brazilian Association of Technical Standard (ABNT) as hazardous waste. The purpose of the present work is to evalua
Publicado em: 2008
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4. CRYSTALLINE FLUORIDE FIBER LASER AND CHARACTERIZATION OF RARE EARTH DOPED FIBERS / Laser de fibra monocristalina de fluoretos e caracterização de fibras dopadas com terras raras
Diode pumped solid state lasers have supplied a large part of the search for high power lasers, with good beam quality, in addition, these lasers are useful for generation of visible laser radiation. Fiber lasers have the capacity to reach these high powers with a good beam quality, due to its special design which confines the radiation through long fiber le
Publicado em: 2008
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5. Análise da emissão de conversão ascendente de energia do sistema vítreo ZBLAN: Er3+ em baixa temperatura
The upconversion process in rare earth elements (Er, Nd, Pr, Tm and Yb) doped fluoride glasses has received great attention from several researches. The main interest is its use in several technological applications as optical amplifiers and lasers. The fluoride glass (ZBLAN) is an amorphous glass and a good rare earth host material with low multiphonon rela
Publicado em: 2006
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6. Métodos de Preparação e Propriedades de Vidros de Fluoretos
The havy metal fluoride glasses have usually many cationic species and many intermediary reactions happen during the smelt. However the melteds cooling is very fast. Thus the proprieties of the glass depend strongly of the chemical way and of the termic history. In this work we study the effect of chemistry way (method of preparation) about the termics and o
Publicado em: 2004
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7. Aplicações da técnica de lente térmica em materiais ópticos. / Applications of the thermal lens technique in optical materials
Neste trabalho, a técnica de Lente Térmica (LT) foi usada para determinar o valor absoluto da difusividade térmica (D), da condutividade térmica (K) e do coeficiente de temperatura do caminho óptico (ds/tD) de vidros fluoretos dopados com cobalto e neodímio, calcogenetos, calcohaletos (mistura de calcogenetos com haletos), aluminate de cálcio e de um
Publicado em: 1999
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8. Propriedades ópticas de vidros de fluoretos de indio e zircônio puros e dopados com Nd ou Pr. / Optic properties of indium and zirconium fluoride glasses pure and doped with Nd or Pr.
We present a new class of heavy metals fluoride glasses (HMF) of InSrBaZnGdNa and InSrBaZnGaNa compositions. We have realized a study of the physical properties such as refraction index, characteristic temperatures, stability and optical properties such as absorption, emission, lifetime of pure, Nd or Pr doped glasses. These properties are similar to those o
Publicado em: 1992
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9. Preparation and characterization of fluorozirconate glasses. / Preparação e caracterização de vidros fluorozirconados.
Replacing BaF2 for NaF yields physical properties modifications on fluorozirconate glasses. An increase of refraction index, thermal stability and young modulus was observed with NaF concentration. Humidity affects less Vickers microhardness than polishing conditions. A simple step model proposed for microhardness does not fit microhardness vs. load behavior
Publicado em: 1992