Borate Glasses
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. JUDD-OFELT ANALYSIS OF Tb3+ AND UPCONVERSION STUDY IN Yb3+-Tb3+ CO-DOPED CALIBO GLASSES
We report on the study of the spectroscopic properties in Ytterbium-Terbium (Yb3+-Tb3+) co-doped calcium lithium borate (CaLiBO) glasses, with the study’s focus being on the upconversion process. Intensity parameters Ωλ for CaLiBO:Tb3+ are determined by the Judd-Ofelt method to be Ω2 = 15.5 × 10-20 cm2, Ω4 = 1.90 × 10-20 cm2 and Ω6 = 3.69 × 10-20 c
Quím. Nova. Publicado em: 2020-02
-
2. Gamma Ray and FTIR Studies in Zinc Doped Lead Borate Glasses for Radiation Shielding Application
Gamma ray shielding properties of borate glass samples containing oxides of lead and zinc are prepared by melt and quench technique and evaluated theoretically using XCOM computer software for gamma ray shielding properties. However, gamma ray shielding properties are discussed in terms of various calculated parameters such as half value layer, mean free pat
Mat. Res.. Publicado em: 14/11/2018
-
3. Preparation and Characterization of the Structural, Optical, Spectroscopic and Electrical Properties of Pr2O5 doped Borate Glass
Abstract We have successfully synthesized Pr2O5 doped borate glasses by conventional rapid melt quench method. The XRD pattern indicates the amorphous nature of Pr2O5 doped borate glass. An optical property of prepared borate glass was studied using the Photoluminescence spectrum. Determination and differentiation of the various vibrational modes were done u
Mat. Res.. Publicado em: 18/07/2016
-
4. Comparative Study of Radiation Shielding Parameters for Bismuth Borate Glasses
Melt and quench technique was used for the preparation of glassy samples of the composition x Bi2O3-(1-x) B2O3 where x= .05 to .040. XCOM computer program is used for the evaluation of gamma-ray shielding parameters of the prepared glass samples. Further the values of mass attenuation coefficients, effective atomic number and half value layer for the glassy
Mat. Res.. Publicado em: 31/05/2016
-
5. Femtosecond lasers for processing glassy and polymeric materials
Novel materials have been developed to meet the increasing mechanical, electrical and optical properties required for technological applications in different fields of sciences. Among the methods available for modifying and improving materials properties, femtosecond laser processing is a potential approach. Owing to its precise ablation and modification cap
Mat. Res.. Publicado em: 27/09/2013
-
6. Preparação de vidros boratos dos sistemas 50B2O315PbO(35-x)Li2OxNa2O e 50B2O315PbO(35-x)LiFxNaF e determinação do efeito dos alcalinos mistos / Preparation of borate glasses from 50B2O315PbO(35-x)Li2OxNa2O and 50B2O315PbO(35-x)LiFxNaF systems and the evaluation of the mixed alkali effect
Different alkali glasses have been developed because exhibit a high ionic conductivity and can be used as solid electrolytes in the fabrication of devices such as batteries and chemical sensors. However, a deleterious effect emerges when two alkali ions are present in the same glassy matrix. The phenomenon, named of the mixed alkali effect (MAE), causes a no
Publicado em: 2010
-
7. Electrical transport phenomenon in the lead bismuth borate glasses
Ternary system of lead-bismuth-borate glasses has been fabricated in three different compositions (PbO)x% - (Bi2O3)(50-x)% - (B2O3)50% with x = 5, 15 and 25 using the melt quench technique. The D.C. electrical transport mechanism has been discussed both in the low and high field regions. The coefficients of barrier lowering are calculated based on the Schott
Brazilian Journal of Physics. Publicado em: 2009-06
-
8. DETERMINAÇÃO DE ELEMENTOS MENORES E TRAÇO EM ROCHAS POR LA-ICPMS: PROGRESSOS NA UTILIZAÇÃO DE VIDROS BORATOS COMO ALVOS / DETERMINATION OF MINOR AND TRACE ELEMENTS IN ROCK SAMPLES BY LA-ICPMS: PROGRESS IN THE UTILIZATION OF BORATE GLASSES AS TARGETS
The present master dissertation is a continuation of a research study developed by Leite (2006) aiming at the multielemental analysis of rock samples (basalts, obsidians and shale) by inductively coupled plasma mass spectrometry (ICPMS), in combination with laser ablation (LA) and using borate glass as analytical targets. As in the former work, the experimen
Publicado em: 2009
-
9. Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses
The effect of increasing the rare earth ion concentration on the physical and spectroscopic properties of Nd3 + doped sodium-lead-borate glasses have been studied for the compositions (10-x) Na2O-30PbO-60B2O3-xNd2O3, where x = 1.00, 1.25, 1.50, 1.75 and 2.00 mol %. Optical band gaps, cut-off wavelengths and various spectroscopic parameters (E¹, E², E³, F2
Brazilian Journal of Physics. Publicado em: 2007-12
-
10. Modificação e cristalização do sistema vítreo BaO-B2O3-RO2 (R=Ti, Si) utilizando a radiação de um laser de CO2 / Modification and crystallization of BaOB2O3RO2(R=Ti, Si) glassy system using a CO2 laser radiation source
Este trabalho apresenta um estudo sobre a modificação e cristalização superficial dos sistemas vítreos 40BaO-45B2O3-15TiO2 (BBT) e 42BaO-42B2O3-16SiO2 (BBS) utilizando a radiação proveniente de um laser modulado de CO2. Três diferentes parâmetros experimentais foram avaliados: a potência do laser, o tempo de exposição à radiação e a presença
Publicado em: 2006
-
11. Thermal and sctructural properties of the CaB4O7-CaB2O4 system viewing the development of thermoluminescent dosimeter / Propriedades térmicas e estruturais do sistema CaB4O7-CaB2O4 visando o desenvolvimento de dosímetro termoluminescente
Borate glasses containing modified oxides have been studied on account of their effective atomic number close to that of the human tissue, what makes them interesting materials for the development of the thermoluminescent dosimeters. The purpose of this work was to study the thermal and structure properties of the xCaB4O7-(100-x)CaB2O4 system with x ranging
Publicado em: 2005
-
12. Análises espectroscópicas em vidros aluminoboratos de bário dopados com íons de Mn / Spectroscopical analyses in barium aluminoborate glasses doped with Mn
As amostras de vidro aluminoborato de bário (BABAL), obtido a partir da estrutura 20 Al2O3. 50 B2O3. 30 BaO mol% dopadas com manganês foram preparadas e caracterizadas pelas técnicas de absorção óptica (AO), ressonância paramagnética eletrônica (RPE) e termoluminescência (TL). O presente estudo está centrado nos íons manganês e nas suas interaç
Publicado em: 2005