Thermoluminescence and defect centres in Tb doped lithium magnesium borate phosphor

2015 ◽  
Vol 167 ◽  
pp. 140-145 ◽  
Author(s):  
S.N. Menon ◽  
Sonal Kadam ◽  
S. Watanabe ◽  
T.K. Gundu Rao ◽  
M.S. Kulkarni ◽  
...  
Keyword(s):  
Magnesium Borate ◽  
Defect Centres

EPR spectra and defect states in glasses of the GexS100-x system

1982 ◽  
Vol 47 (7) ◽  
pp. 1787-1793 ◽  
Author(s):  
Miloslav Frumar ◽  
Gustáv Plesch ◽  
Eva Černošková ◽  
Václav Černý ◽  
Ladislav Tichý ◽  
...  
Keyword(s):  
Experimental Data ◽  
Epr Spectra ◽  
Defect States ◽  
Composition Region ◽  
Active Defect ◽  
Temperature Conditions ◽  
Defect Centres

Glasses of the GexS100-x system were studied in the region of 30 ⪬ x ⪬ 45. The concept of magnetically active defect centres was employed to account for the EPR spectra of pure samples as well as those doped with silver or iodine, prepared in different temperature conditions. In terms of this concept a consistent interpretation of the experimental data could be given for the composition region applied.

Performance of two Magnesium borate compounds, with thermoluminescent properties, to γ-rays and neutrons

2021 ◽  
pp. 109418
Author(s):  
Carina Oliva Torres-Cortes ◽  
Hector Rene Vega-Carrillo ◽  
Luis Hernandez-Adame ◽  
Antonio Baltazar-Raigosa ◽  
Angel Garcia-Duran ◽  
...  
Keyword(s):  
Magnesium Borate ◽  
Γ Rays

A low-temperature, environment-friendly approach to the synthesis of magnesium borates using magnesium waste scraps

2015 ◽  
Vol 0 (0) ◽  
Author(s):  
Aycin Kaplan ◽  
Azmi Seyhun Kipcak ◽  
Fatma Tugce Senberber ◽  
Emek Moroydor Derun ◽  
Sabriye Piskin
Keyword(s):  
Low Temperature ◽  
Boric Acid ◽  
Boron Oxide ◽  
X Ray Diffraction ◽  
Magnesium Borate ◽  
Environment Friendly ◽  
X Ray ◽  
Temperature Environment ◽  
Mixing Method ◽  
Boron Source

AbstractIn the present study, magnesium borate synthesis was performed by a hydrothermal mixing method, with the use of magnesium waste scraps (W) as the magnesium source, along with boric acid (H) or boron oxide (B) as the boron source. For an environment-friendly approach, a solid waste of magnesium was used at low reaction temperatures. Results of X-ray diffraction analyses showed that admontite [MgO(B

Identification of defect centres using TSL, PL, OSL and ESR studies in LiAlO2based phosphors

2008 ◽  
Vol 41 (11) ◽  
pp. 115414 ◽  
Author(s):  
Bhushan Dhabekar ◽  
E Alagu Raja ◽  
Sanjeev Menon ◽  
T K Gundu Rao ◽  
R K Kher ◽  
...  
Keyword(s):  
Defect Centres

Magneto-optical properties of defect centres in alkali halide crystals

1967 ◽  
Vol 300 (1460) ◽  
pp. 78-93 ◽  
Keyword(s):  
Optical Absorption ◽  
Silver Atom ◽  
Alkali Halides ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Coupling Constant ◽  
Absorption Bands ◽  
Optical Effects ◽  
Alkali Halide Crystals ◽  
Defect Centres

Zeeman spectroscopy is not practicable for the investigation of the structure of electronic conventional states which give rise to broad optical absorption bands in solids. We have investigated the application of Faraday rotation and circular dichroism techniques to absorption bands of neutral silver atoms and F centres in alkali halides. These centres give rise to optical absorption bands due to transitions of the type 2 S → 2 P which are 2000 to 6000 cm -1 in width because, in part, of strong coupling to lattice phonons. A discussion is given of information which may be obtained concerning the electonic states involved in the 2 S → 2 P transition by analysis of the magneto-optical effects by the method of moments. It is shown, for example, that the spin-orbit coupling constant of the 2 P state of the silver atom is reduced from 613 cm -1 in the free state to 365 cm -1 in KCl, to 102 cm -1 in KBr and to an unmeasurably small value in KI. This cancellation of spin-orbit interaction of the silver atom is assigned to symmetry allowed admixtures of lattice ion wavefunctions into the 2 P state.

scholarly journals Synthesis, Structure and Growth Mechanism of Magnesium Borate Nanobelts

2006 ◽  
Vol 22 (01) ◽  
pp. 110-113
Author(s):  
ZHANG Jiang ◽  
◽  
ZHAO Yan-ming
Keyword(s):  
Growth Mechanism ◽  
Magnesium Borate

Infrared absorption by the single nitrogen and A defect centres in diamond

1994 ◽  
Vol 69 (6) ◽  
pp. 1141-1147 ◽  
Author(s):  
I. Kiflawi ◽  
A. E. Mayer ◽  
P. M. Spear ◽  
J. A. Van Wyk ◽  
G. S. Woods
Keyword(s):  
Infrared Absorption ◽  
Defect Centres

scholarly journals Sonochemical-assisted magnesium borate synthesis from different boron sources

2017 ◽  
Vol 19 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Meral Yildirim ◽  
Azmi Seyhun Kipcak ◽  
Emek Moroydor Derun
Keyword(s):  
High Efficiency ◽  
Synthesis Method ◽  
Spectroscopic Studies ◽  
X Ray Diffraction ◽  
Magnesium Borate ◽  
Ir And Raman Spectroscopies ◽  
Ft Ir ◽  
Surface Morphologies ◽  
Ir And Raman ◽  
Good Agreement

Abstract In this study, sonochemical-assisted magnesium borate synthesis is studied from different boron sources. Various reaction parameters are successfully applied by a simple and green method. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and Raman spectroscopies are used to characterize the synthesized magnesium borates on the other hand surface morphologies are investigated by using scanning electron microscope (SEM). The XRD analyses showed that the products were admontite [MgO(B2O3)3 · 7(H2O)] with JCPDS (Joint Committee on Powder Diffraction Standards) no. of 01-076-0540 and mcallisterite [Mg2(B6O7(OH)6)2 · 9(H2O)] with JCPDS no. of 01-070-1902. The results that found in the spectroscopic studies were in a good agreement with characteristic magnesium borate bands in both regions of infra-red and visible. According to SEM results, obtained borates were in micro and sub-micro scales. By the use of ultrasonication, reaction yields were found between 84.2 and 97.9%. As a result, it is concluded that the sonochemical approach is a practicable synthesis method to get high efficiency and high crystallinity in the synthesis magnesium borate compounds.

Sign in / Sign up

Export Citation Format

Share Document