Synchrotron Radiation Research and Application at VEPP-4

Piminov, P.; Баранов, Г. Н.; Bogomyagkov, A.; Berkaev, D. E.; Borin, Vladislav; Дорохов, В. Б.; Karnaev, S. E.; Киселев, В. А.; Levichev, E.; Meshkov, O.; Mishnev, S. I.; Никитин, С. А.; Nikolaev, I. B.; Sinyatkin, S. V.; Vobly, P.D.; Zolotarev, K.V.; Журавлев, А. Н.

doi:10.1016/j.phpro.2016.11.005

Cited by 150 publications

(34 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The S K-edge NEXAFS spectra were measured in the transmission mode using a precision silicon photodiode SPD [31] at beamline Cosmos at the VEPP-4M storage ring of BINP SB RAS [32,33]. The ring current was about 5-10 mA at 1.9 GeV.…”

Section: Characterization Methodsmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

View full text Add to dashboard Cite

Filling of single-walled carbon nanotubes (SWCNTs) and extraction of the encapsulated species from their cavities are perspective treatments for tuning the functional properties of SWCNT-based materials. Here, we have investigated sulfur-modified SWCNTs synthesized by the ampoule method. The morphology and chemical states of carbon and sulfur were analyzed by transmission electron microscopy, Raman scattering, thermogravimetric analysis, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies. Successful encapsulation of sulfur inside SWCNTs cavities was demonstrated. The peculiarities of interactions of SWCNTs with encapsulated and external sulfur species were analyzed in details. In particular, the donor–acceptor interaction between encapsulated sulfur and host SWCNT is experimentally demonstrated. The sulfur-filled SWCNTs were continuously irradiated in situ with polychromatic photon beam of high intensity. Comparison of X-ray spectra of the samples before and after the treatment revealed sulfur transport from the interior to the surface of SWCNTs bundles, in particular extraction of sulfur from the SWCNT cavity. These results show that the moderate heating of filled nanotubes could be used to de-encapsulate the guest species tuning the local composition, and hence, the functional properties of SWCNT-based materials.

show abstract

Section: Characterization Methodsmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In situ X-ray diffraction experiments were conducted at the beamline #4 of the VEPP-3 storage ring of the SSTRC (Novosibirsk, Russia) (λ = 0.3685 Å) [36]. MAR345 imaging plate detector (pixel dimension 100 µm) was used for data collecting.…”

Section: Dac-sstrcmentioning

confidence: 99%

High-Pressure Phase Diagrams of Na2CO3 and K2CO3

et al. 2019

View full text Add to dashboard Cite

The phase diagrams of Na 2 CO 3 and K 2 CO 3 have been determined with multianvil (MA) and diamond anvil cell (DAC) techniques. In MA experiments with heating, γ -Na 2 CO 3 is stable up to 12 GPa and above this pressure transforms to P 6 3 /mcm-phase. At 26 GPa, Na 2 CO 3 - P 6 3 /mcm transforms to the new phase with a diffraction pattern similar to that of the theoretically predicted Na 2 CO 3 - P 2 1 /m. On cold compression in DAC experiments, γ -Na 2 CO 3 is stable up to the maximum pressure reached of 25 GPa. K 2 CO 3 shows a more complex sequence of phase transitions. Unlike γ Na 2 CO 3 , γ -K 2 CO 3 has a narrow stability field. At 3 GPa, K 2 CO 3 presents in the form of the new phase, called K 2 CO 3 -III, which transforms into another new phase, K 2 CO 3 -IV, above 9 GPa. In the pressure range of 9–15 GPa, another new phase or the mixture of phases III and IV is observed. The diffraction pattern of K 2 CO 3 -IV has similarities with that of the theoretically predicted K 2 CO 3 - P 2 1 /m and most of the diffraction peaks can be indexed with this structure. Water has a dramatic effect on the phase transitions of K 2 CO 3 . Reconstruction of the diffraction pattern of γ -K 2 CO 3 is observed at pressures of 0.5–3.1 GPa if the DAC is loaded on the air.

show abstract

“…High-temperature experiments were carried with time-resolved diffractometry at channel 5b of the Siberian Synchrotron and Therahertz Radiation Centre 17,18 . The wavelength used was 1.516 A.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Zr(Mo,W)2O8 with a larger negative thermal expansion by controlling the thermal decomposition of Zr(Mo,W)2(OH,Cl)2∙2H2O

Petrushina

Дедова

Filatov

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Solid solutions of Zr(Mo,W)2O7(OH,Cl)2∙2H2O with a preset ratio of components were prepared by a hydrothermal method. The chemical composition of the solutions was determined by energy dispersive X-ray spectroscopy (EDX). For all the samples of ZrMoxW2−xO7(OH,Cl)2∙2H2O (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0), TGA and in situ powder X-ray diffraction (PXRD) studies (300–1100 K) were conducted. For each case, the boundaries of the transformations were determined: Zr(Mo,W)2O7(OH,Cl)2∙2H2O → orthorhombic-ZrMoxW2−xO8 (425–525 K), orthorhombic-ZrMoxW2−xO8 → cubic-ZrMoxW2−xO8 (700–850 K), cubic-ZrMoxW2−xO8 → trigonal-ZrMoxW2−xO8 (800–1050 K for x > 1) and cubic-ZrMoxW2−xO8 → oxides (1000–1075 K for x ≤ 1). The cell parameters of the disordered cubic-ZrMoxW2−xO8 (space group Pa-3) were measured within 300–900 K, and the thermal expansion coefficients were calculated: −3.5∙10−6 – −4.5∙10−6 K−1. For the ordered ZrMo1.8W0.2O8 (space group P213), a negative thermal expansion (NTE) coefficient −9.6∙10−6 K−1 (300-400 K) was calculated. Orthorhombic-ZrW2O8 is formed upon the decomposition of ZrW2O7(OH,Cl)2∙2H2O within 500–800 K.

show abstract

Synchrotron Radiation Research and Application at VEPP-4

Cited by 150 publications

References 17 publications

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

High-Pressure Phase Diagrams of Na2CO3 and K2CO3

Preparation of Zr(Mo,W)2O8 with a larger negative thermal expansion by controlling the thermal decomposition of Zr(Mo,W)2(OH,Cl)2∙2H2O

Contact Info

Product

Resources

About