Evolution of Free Volumes in Polycrystalline BaGa2O4 Ceramics Doped with Eu3+ Ions

Klym, Halyna; Karbovnyk, Ivan; Luchechko, A.; Kostiv, Yuriy; Pankratova, Viktorija; Попов, А. И.

doi:10.3390/cryst11121515

Cited by 19 publications

(5 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are two primary viewpoints regarding this: one holds that the orange RPL is related to Ag 2+ defect center luminescence [15,33,34], the other holds that it is related to the co-luminescence of Ag 2+ and Ag 2 + [1,32,35]. Unlike chalcogenide glasses [36,37], phosphate glasses have short chemical bonds and compact structures. Consequently, the effect of holes on radiation performance is not considered for the time being.…”

Section: The Fluorescence Spectra Of the Ag-doped And Ag-nd-codoped P...mentioning

confidence: 99%

Silver-Neodymium Codoped Lithium Aluminum Metaphosphate Glasses for Radio-Photoluminescence Dosimeter

Cheng

Song

et al. 2022

Materials

View full text Add to dashboard Cite

Commercial radio-photoluminescence (RPL) glass dosimeters generally use Ag single-doped phosphate glass as a single-wavelength sensor. Now, a novel type of Ag–Nd-codoped phosphate glass has been developed, which can be applied to dual-wavelength or multi-wavelength RPL sensors, and can thus improve the accuracy and stability of RPL dosimeters. An anhydrous 99.5 (0.7LiPO3–0.3Al (PO3)3) −0.25Ag2O–0.25Nd2O3 glass was prepared and irradiated at different doses, and then the absorption, fluorescence, infrared transmission spectra, as well as fluorescence lifetimes were tested and analyzed. The results show that there is an energy transfer between the Ag defect center and Nd3+ ions, and the transfer efficiency using 380 nm excitation is greater than that using 310 nm excitation. Aside from the 650 nm fluorescence of the Ag defect center, strong 882 nm and 1054 nm fluorescences of Nd ions are exhibited. It is possible that these fluorescences would allow the developed Ag–Nd-codoped phosphate glass to be applied to new RPL glass sensors and dosimeters.

show abstract

Section: The Fluorescence Spectra Of the Ag-doped And Ag-nd-codoped P...mentioning

confidence: 99%

Silver-Neodymium Codoped Lithium Aluminum Metaphosphate Glasses for Radio-Photoluminescence Dosimeter

Cheng

Song

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Recently, it has been customary to study such porous materials and free volumes using the positron annihilation method. 27,28 However, there are a number of disadvantages of chemical and electrochemical treatment methods; the key disadvantage is poor reproducibility of results.…”

Section: Introductionmentioning

confidence: 99%

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Suchikova

Ковачов

Bohdanov

2022

Nanomaterials and Nanotechnology

View full text Add to dashboard Cite

We demonstrate how the formation of octahedral microcrystals of arsenic oxide As2O3 in the form of arsenolite with a size of 200 nm to 10 μm can be initiated by the electrochemical etching method with simultaneous deposition on the surface of substrates with n-GaAs (111). Crystallites were formed on a previously synthesized porous layer of GaAs. To explain the behavior of formation on the surface of the monocrystalline GaAs porous layer and As2O3 crystallites in the electrochemical reaction, we propose a qualitative model based on the decomposition of binary semiconductors in contact with electrolytes. Under this model, the crystallization of precipitated oxides occurs as a result of the transfer of ions to the crystal surface as a result of the electrolysis process. The formation of the composite structure takes place on the surface of the semiconductor and is characterized by the minimization of elastic energy. XRD analysis showed the formation of a complex compound of As2O3 and As0.172Sb0.570O1.113. The appearance of antimony is explained in terms of the formation of new centers when the As atom is replaced by an Sb doping atom in the crystal. Directed controlled oxidation technologies make it possible to synthesize a reliable passivating layer consisting of one type of oxide, namely As2O3 in the cubic phase of arsenolite. In addition, such structures can be used in photonics devices and as photocatalysts.

show abstract

“…Spinel-type cobalt ferrite is a kind of spinel-type ferrite with excellent performance, which has medium saturation magnetization strength, excellent chemical stability, high coercivity, strong wear anisotropy, high mechanical strength, and large magnet crystal anisotropy constant, so it has a wide range of applications in rechargeable batteries, high-density magnetic recording, biomedicine and other fields [28]. At the same time, cobalt ferrate is also a good electromagnetic wave-absorbing material, which enhances the effect on electromagnetic waves due to its many pores, and has received wide attention from scholars in the field of microwave absorption [29,30]. Fu et al [31] prepared a new CoFe 2 O 4 hollow sphere/graphene composite using a facile vapor diffusion method in combination with calcination at 550 • C. The composite achieved a minimum reflection loss value of −18.58 dB at 12.9 GHz and effective absorption bandwidth of 3.7 GHz when the thickness is 2 mm.…”

Section: Introductionmentioning

confidence: 99%

Micro-Structural Design of CoFe2O4/SWCNTs Composites for Enhanced Electromagnetic Properties

et al. 2022

View full text Add to dashboard Cite

In order to prepare microwave-absorbing materials with low density and high wave absorption performance, CoFe2O4/SWCNTs composites with well-designed necklace-like structures were successfully prepared in this paper by a simple solvothermal method. CoFe2O4/SWCNTs composites with different cobalt salt contents were synthesized by adjusting the experimental parameters. The results of the relative complex permeability and relative permittivity of the samples, which were investigated by vector network analysis in the frequency range of 2 to 18 GHz, are collected to support the study of the microwave absorption characteristics of the samples. Different microsphere densities and different cobalt salt contents have obvious differences in the electromagnetic absorption properties of the composites. When the additions of FeCl3·6H2O, Co(Ac)2·4H2O, and NH4Ac were 0.432, 0.200, and 0.400 g, respectively, the best reflection loss reached −42.07 dB, and the effective absorption frequency (RL < −10 dB) ranges from 3.2 to 18 GHz. Therefore, this is a preparation strategy of CoFe2O4/SWCNTs composites with necklace structure, which has the advantages of simple process, environmental friendliness, low cost, and high stability. The unique necklace-like structure design makes the carbon nanotubes partially exposed, which is more beneficial to achieve good impedance matching and giving the CoFe2O4/SWCNTs composite excellent electromagnetic loss capability.

show abstract

Evolution of Free Volumes in Polycrystalline BaGa2O4 Ceramics Doped with Eu3+ Ions

Cited by 19 publications

References 63 publications

Silver-Neodymium Codoped Lithium Aluminum Metaphosphate Glasses for Radio-Photoluminescence Dosimeter

Silver-Neodymium Codoped Lithium Aluminum Metaphosphate Glasses for Radio-Photoluminescence Dosimeter

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Micro-Structural Design of CoFe2O4/SWCNTs Composites for Enhanced Electromagnetic Properties

Contact Info

Product

Resources

About