Preparation of composites of topaz embedded in glass matrix for applications in solid state thermoluminescence dosimetry

Magalhães, C. M. S. de; Macedo, Zélia Soares; Valério, Mário E.G.; Hernandes, Antônio Carlos; Souza, Divanízia do Nascimento

doi:10.1016/j.nimb.2003.12.064

Cited by 19 publications

(15 citation statements)

References 10 publications

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“…Using the solid precursor sodium hexafluorosilicate (Na 2 SiF 6 ) and aluminum hydroxide (Al(OH) 3 ) substrate compacts, the aim of this investigation is to study the effect of temperature, time, atmosphere, position angle of the solid reactant substrate, interaction of atmosphere with position angle (A x P) and the interaction of temperature with position angle (T x P) on the formation, amount and crystalline lattice parameters of topaz synthesized by CVD. Likewise, the investigation aims at putting forward an insight into the pathway or possible reactions that take place during the synthesis of CVD-topaz.…”

Section: Tablementioning

confidence: 99%

“…In the first stage, thermodynamic feasibility calculations of possible reactions between Al(OH) 3 and SiF 4 were performed.…”

Section: -Experimental Proceduresmentioning

confidence: 99%

“…Due to the fact that SiF 4 (g) is obtained from the dissociation of the solid precursor Na 2 SiF 6 , thermodynamic feasibility calculations for two possible reactions between Al(OH) 3 and SiF 4 (g) were performed and presented in Figure 2 as graphs of Gibbs free energy change vs. temperature. Figure 2 shows that although both reactions are thermodynamically viable, formation of fluoro-topaz is not only thermodynamically more feasible than formation of hydroxyl-topaz but also the feasibility temperature range is larger than that for hydroxyltopaz.…”

Section: Thermodynamic Feasibility For Formation Of Fluoro-topaz (Al mentioning

confidence: 99%

“…It has a hardness of 8 in the Mohs scale and is highly resistant to a number of chemicals including hydrofluoric acid [1][2][3][4]. The mineral is formed naturally in pneumatolytic (400 -500 °C) or hydrothermal stages (100-400 °C) of igneous activity in acid igneous rocks (>65% SiO 2 ), such as granites, granite pegmatites and rhyolits [5,6].…”

Section: -Introductionmentioning

confidence: 99%

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Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

Trujillo-Vázquez

Pech-Canul

2015

Journal of Solid State Chemistry

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Section: Tablementioning

confidence: 99%

“…In the first stage, thermodynamic feasibility calculations of possible reactions between Al(OH) 3 and SiF 4 were performed.…”

Section: -Experimental Proceduresmentioning

confidence: 99%

Section: Thermodynamic Feasibility For Formation Of Fluoro-topaz (Al mentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

Trujillo-Vázquez

Pech-Canul

2015

Journal of Solid State Chemistry

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“…-are used not only as gemstones but also used in practice. For example, topaz crystals are suitable material for dosimetric applications [1,2]. In turn, beryl crystals doped with transition metal ions find applications as laser materials [3].…”

Section: Introductionmentioning

confidence: 99%

Optical absorption and luminescence studies of fast neutron-irradiated complex oxides for jewellery applications

Миронова-Улмане

Skvortsova

Попов

2016

Low Temperature Physics

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We studied the optical absorption and luminescence of agate (SiO 2 ), topaz (Al 2 [SiO 4 ](F,OH) 2 ), beryl (Be 3 Al 2 Si 6 O 18 ), and prehnite (Ca 2 Al(AlSi 3 O 10 )(OH) 2 ) doped with different concentrations of transition metal ions and exposed to fast neutron irradiation. The exchange interaction between the impurity ions and the defects arising under neutron irradiation causes additional absorption as well as bands' broadening in the crystals. These experimental results allow us to suggest the method for obtaining new radiation-defect induced jewellery colors of minerals due to neutron irradiation.

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Glass Matrix Composite

Bernardo

2011

Wiley Encyclopedia of Composites

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Glass and glass–ceramic matrix composites represent a very particular type of composite materials. As in most ceramic matrix composites, the reinforcements are mainly intended to increase the resistance to crack propagation, that is, the most significant weakness of the matrices, due to several toughening mechanisms. Unlike polycrystalline ceramic matrices, however, glasses offer the distinctive feature of viscous flow, being readily deformed and flowed in their low viscosity state, with the possibility of incorporating secondary phases at moderately high temperatures. Fibrous reinforcements (mainly C and SiC fibers) are at the basis of materials with impressive properties, for example, strength above 1 GPa, fracture toughness up to 35 MPa m 0.5 , almost zero thermal expansion, and service temperature up to 1500°C, but still facing high costs, although known for many years. Recent applications, such as that of “optomechanical materials,” that is, transparent materials with improved crack resistance, may stimulate research investments and production. As an alternative, dispersion‐reinforced composites, first seen as lower value category, owing to the limited improvements in fracture toughness, are currently the candidates for extensive industrial production, since the low cost treatments applied may be combined with complex combinations of different functionalities.

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Preparation of composites of topaz embedded in glass matrix for applications in solid state thermoluminescence dosimetry

Cited by 19 publications

References 10 publications

Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

Optical absorption and luminescence studies of fast neutron-irradiated complex oxides for jewellery applications

Glass Matrix Composite

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