scholarly journals SYNTHESIS OF ZINC SULFIDE RADIOLUMINESCENT PHOSPHORS WITH USE OF ELECTRONIC BEAM MODIFICATION AND INVESTIGATION OF THEIR PROPERTIES

2021 ◽  
Vol 58 ◽  
pp. 46-50
Author(s):  
Mikhail A. Shvindin ◽  
◽  
Vadim V. Bakhmetyev ◽  
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Electron Beam ◽  
Solid State ◽  
Zinc Sulfide ◽  
Spectral Characteristics ◽  
Light Sources ◽  
Synthesis Conditions ◽  
Radioluminescent Light Sources ◽  
First Time

Synthesized recombination-type zinc sulfide phosphors used in solid-state radioluminescent light sources (SSRLS) are the object of the research. In the course of the study, experimental data were obtained for the first time on the effect of the amount of the incorporated activator on the brightness-spectral characteristics of radioluminescence upon excitation by β-radiation of tritium. Data were obtained on the changes in the radioluminescence parameters under various synthesis conditions, phase composition and electron-beam modification of the crystal structure of the initial phosphors. The results of the work make it possible to find the best light compositions for the use in solid-state radioluminescent light sources

scholarly journals Synthesis of ZnS:Cu,Br radioluminescent phosphors using the electron-beam treatment and studying their characteristics

2021 ◽  
Vol 2056 (1) ◽  
pp. 012047
Author(s):  
V V Bakhmetyev ◽  
E V Zelenina ◽  
M A Shvindin
Keyword(s):  
Electron Beam ◽  
Solid State ◽  
Short Range ◽  
Light Sources ◽  
Electron Beam Treatment ◽  
Phase Content ◽  
Acid Base ◽  
Safety Control ◽  
Initial Charge ◽  
Radioluminescent Light Sources

Abstract ZnS:Cu radioluminescent phosphors find their applications in medicine nondestructive testing, safety control and can be used as a part of the solid-state radioluminescent light sources (SRLS). This devices are very promising technology due to their independence longevity and safety compared to the gas-filled RLS. Because of the fact that tritium (the most popular radioisotope for RLS) has a very short range in substances, the improving the operating performances of radiophosphors is a crucial task for SRLS. In our study we used the electron-beam treatment to increase the brightness of radioluminescence of ZnS:Cu phosphors. It was found that bombardment of the phosphors initial charge with electrons of 900 kEv energy improves the brightness of radioluminescence by 15 – 20%. Double modifying of the initial charge and ready phosphor cause the 80% increase of brightness. The effect of electron-beam treatment on the phase content and the surface properties was studied at varying the content of activator (Cu) in the range of 0 – 0.6 % mass. As a result the model describing structure of the acid-base sites on the ZnS:Cu phosphor surface was suggested.

Synthesis and Electron-Beam Modification of Zinc-Sulphide Phosphors for Solid-State Radioluminescent Light Sources (SRLS)

2021 ◽  
Vol 1040 ◽  
pp. 35-40
Author(s):  
Elena V. Zelenina ◽  
Vadim V. Bakhmetyev ◽  
Maxim М. Sychov ◽  
Mikhail A. Shvindin
Keyword(s):  
Electron Beam ◽  
Solid State ◽  
High Energy ◽  
Zinc Sulphide ◽  
Structural Defects ◽  
Light Sources ◽  
Electron Beam Treatment ◽  
Phase Content ◽  
Initial Batch ◽  
Radioluminescent Light Sources

Radioluminescence technologies are at the front line of the optic and electronic studies. Effective, self-contained and safe radioluminescent light sources can find their application in space industry, in medicine and in military technologies. The question of the performance improvement of the solid-state radioluminescent light sources (SRLS) without raising the included activity of working radionuclide can be solved by upgrading the phosphor crystalline structure. The electron-beam treatment for zinc-sulphide phosphors initial batch has been studied in a wide range of concentrations of the activating agent (Cu) for improving the radioluminescent performances of the phosphors, for creating the structural defects that form centers of luminescence. The changes of the phase composition were investigated under different synthesis conditions. It is revealed that electron-beam treatment of the initial batch leads to the growth of the wurtzite phase content in zinc-sulphide phosphors synthesized below the phase transition temperature. The changes of the phase content promote the spectral redistribution under the tritium beta-excitation. It is obviously the reflection of the fact of «green» luminescence centers rearrangement between the volume of the crystal and its surface. The correlations between structural configuration and performances of ionizing luminescence were found. Electron beam treatment gave the 20% increase of brightness of the radioluminescence. The achieved enhancement of luminescence performances allows the development of advanced tight-packed SRLS with minimal radioactivity and high energy-light conversion.

scholarly journals Becquerelite mineral phase: crystal structure and thermodynamic and mechanical stability by using periodic DFT

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24599-24616 ◽  
Author(s):  
Francisco Colmenero ◽  
Ana María Fernández ◽  
Vicente Timón ◽  
Joaquin Cobos
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Solid State ◽  
Mechanical Stability ◽  
Mineral Phase ◽  
Phase Crystal ◽  
Complete Study ◽  
First Time ◽  
Periodic Dft

The full crystal structure of becquerelite mineral phase was successfully determined using theoretical solid-state methods for the first time. Additionally, a complete study of its thermodynamic and mechanical properties and stability is reported.

Immobilization of Eu3+ Ions in Zeolite Matrices in Order to Develop Solid-State Radioluminescent Light Sources

2019 ◽  
Vol 45 (6) ◽  
pp. 537-544
Author(s):  
N. Yu. Ul’yanova ◽  
E. V. Zelenina ◽  
V. L. Ugolkov ◽  
O. Yu. Golubeva
Keyword(s):  
Solid State ◽  
Light Sources ◽  
Radioluminescent Light Sources

Prospects for the Development of Tritium-Based Solid-State Radioluminescent Light Sources

2019 ◽  
Vol 61 (1) ◽  
pp. 55-60 ◽  
Author(s):  
E. V. Zelenina ◽  
M. M. Sychov ◽  
A. I. Kostylev ◽  
K. A. Ogurtsov
Keyword(s):  
Solid State ◽  
Light Sources ◽  
Radioluminescent Light Sources

The Crystal Structure of cis-Chlorobis(triethylphosphine)-1,10-phenanthrolineplatinum(II) fluoroborate, (PtCl(PEt3)2(phen))BF4, a Complex Containing Monodentate 1,10-Phenanthroline

1974 ◽  
Vol 52 (8) ◽  
pp. 1367-1376 ◽  
Author(s):  
Gordon W. Bushnell ◽  
Keith R. Dixon ◽  
Masood A. Khan
Keyword(s):  
Crystal Structure ◽  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Interatomic Distances ◽  
Square Planar ◽  
Cell Dimensions ◽  
Tetragonal Pyramidal ◽  
R Value ◽  
First Time

The crystal structure of cis-chlorobis(triethylphosphine)-1,10-phenanthrolineplatinum(II) fluoroborate has been determined and refined to an R-value of 0.051. The space group is P21/c and the cell dimensions are a = 0.9215(2), b = 1.1991(3), c = 2.6832(6) nm, β = 99.38(3)°, with 4 molecules per unit cell. The interatomic distances to Pt are: Pt—N(1), 213.7(19); Pt—N(2), 284.3(20); Pt—P(1), 223.9(7); Pt—P(2), 224.1(6); Pt—Cl, 236.1(6) pm.The coordination number and geometry is discussed in terms of 5-coordinate tetragonal pyramidal and 4-coordinate square planar models, the latter being regarded as the more acceptable.Monodentate o-phenanthroline is thus observed for the first time in the solid state. The structure of the complex in solution is discussed with the aid of conductance and nuclear magnetic resonance results which suggest the possibility of a novel fluxional system.

scholarly journals ADVANCED TECHNOLOGY OF LUMINOPHOR SCREENS FOR SOLID RADIOLUMINESCENT LIGHT SOURCES

Doklady BGUIR ◽  
2019 ◽  
pp. 59-66
Author(s):  
E. V. Zelenina ◽  
E. A. Pechertseva ◽  
V. V. Bakhmetyev ◽  
M. M. Sychov
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Main Idea ◽  
Advanced Technology ◽  
Solid Matrix ◽  
Light Sources ◽  
Phosphor Screen ◽  
Gel Technique ◽  
Radioluminescent Light Sources ◽  
Phosphor Screens

The article observes different methods of coating the phosphor screens on the tritiated titanium matrices for creating the solid-state radioluminescent light sources (SRLS). Technology of SRLS is alternative to the existing technology of the gas-filled radioluminescent light sources. The main idea of SRLS is in bonding the working isotope (tritium) in the solid matrix and combining it with the phosphor. The key problem of SRLS is to provide the closest contact between the tritiated carrier matrix and phosphor screen. The basic requirements for the phosphor screens for SRLS would be the strength of fixation on the plate, uniformity and radiological and thermal stability. There have been made a comparison of various techniques of coating and fixing the phosphor screens by their effect on spectral and brightness characteristics of SRLS. The improved sol-gel technique of suspended sedimentation of phosphor screen from the potassium water glass binder solution was developed. The composition of the solution was established experimentally and we get the strong and uniform experimental prototypes of the glass coated phosphor screens of various thickness. The developed technology allows to deposit the strong and uniform phosphor coatings without using any additional dispersing agents. Screen thickness regulates by the amount of phosphor in the suspension. Also the optimal thickness of the phosphor screen, giving the maximum luminescence intensity was determined. The two laboratory prototypes of solid-state radioluminescent light sources were manufactured by coating the phosphor directly on the tritium β-source.

Darstellung und Kristallstrukturanalyse von K3BiO3 und Rb3BiO3 / Synthesis and Crystal Structure Determination of K3BiO3 and Rb3BiO3

1997 ◽  
Vol 52 (9) ◽  
pp. 1031-1036 ◽  
Author(s):  
Nicola Zoche ◽  
Martin Jansen
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystal ◽  
Structure Determination ◽  
Solid State Reactions ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Binary Compounds ◽  
First Time

K3BiO3 and Rb3BiO3 have been synthesized for the first time by solid state reactions of the respective binary compounds. K3BiO3 was obtained from Bi2O3 and K2O at 550 °C, Rb3BiO3 from Bi2O3 and Rb2O at 650 °C. The compounds were structurally examined by single-crystal X -ray investigations (K3BiO3: I 4̅ 3 m, a = 1070.15(2) pm, Z = 8; Rb3BiO3: P 21 3, a = 875.48(2) pm, Z = 4). The structures reveal “isolated” BiO33- groups. While K3BiO3 is isostructural to Na3BiO3, Rb3BiO3 has the same crystal structure as Cs3BiO3.

Diastereotopic group recognition in the solid state — A unique intramolecular β-cyclodextrin inclusion complex

2001 ◽  
Vol 79 (11) ◽  
pp. 1806-1811
Author(s):  
Manfred T Reetz ◽  
Joachim Rudolph ◽  
Richard Goddard
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Inclusion Complex ◽  
Supramolecular Chemistry ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Close Vicinity ◽  
Cyclodextrin Inclusion ◽  
Cyclodextrin Inclusion Complex ◽  
First Time

The phenomenon of diastereotopic group recognition has been structurally documented for the first time. A diphenylphosphine-modified β-cyclodextrin having two diastereotopic phenyl groups in close vicinity to the inner cavity of this host was prepared. The crystal structure analysis reveals selective intramolecular complexation of one of the two diastereotopic phenyl groups.Key words: supramolecular chemistry, stereotopic group recognition, cyclodextrins, intramolecular complexation.

Structure determination of the theophylline–nicotinamide cocrystal: a combined powder XRD, 1D solid-state NMR, and theoretical calculation study

CrystEngComm ◽  
2014 ◽  
Vol 16 (15) ◽  
pp. 3141-3147 ◽  
Author(s):  
Ping Li ◽  
Yueying Chu ◽  
Lin Wang ◽  
Robert M. Wenslow ◽  
Kaichao Yu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Theoretical Calculation ◽  
Structure Determination ◽  
Solid State Nmr ◽  
Powder Xrd ◽  
First Time

The crystal structure of the theophylline–nicotinamide cocrystal is determined for the first time by using a combined multi-technique approach.

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