Neutron diffractometer for real-time studies of transient processes at the IBR-2 pulsed reactor

Балагуров, А.М.; Beskrovnyy, A. I.; Zhuravlev, V. V.; Mironova, G. M.; Бобриков, И.А.; Neov, D.; Sheverev, S. G.

doi:10.1134/s1027451016030046

Cited by 29 publications

(9 citation statements)

References 12 publications

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“…The technical parameters of the station were reported previously. 14 The TOF-ND patterns were fitted using the GSAS-II software. 15 In order to analyze the microstructure and the elemental composition of the samples, the powders were packed in epoxy resin and polished using a set of diamond suspensions.…”

Section: Sample Characterizationmentioning

confidence: 99%

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

et al. 2021

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A variety of the ternary Hf-Ir-B phases formed via the reaction between iridium and hafnium diboride at elevated temperatures was found. The data on the phase and elemental composition, as well as crystal structure, obtained by powder and single-crystal X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray spectrometer, and time-of-flight neutron diffraction analysis unambiguously confirm that HfIr 3 B x solid solution, two known ternary borides (HfIr 3 B 4 , Hf 2 Ir 5 B 2 ), as well as two novel ternary HfIr 2.1 B 1.3 and HfIr 5.7 B 2.7 phases, are formed at elevated temperatures. This result is fundamentally different from that previously obtained by us for the Hf-Ir-C system in which only one binary intermetallic compound, HfIr 3 , was produced. The measured Vickers microhardness for all the aforementioned ternary borides (13-19 GPa) allows us to consider them hard. The coefficients of thermal expansion of ternary borides were measured by in situ high-temperature X-ray analysis.

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Section: Sample Characterizationmentioning

confidence: 99%

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

et al. 2021

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“…Neutron diffraction experiments were carried out on the diffractometer DN-2, located on a high-flux pulsed neutron reactor Fast Neutron Pulse Reactor IBR-2 (Laboratory of Neutron Physics named I.M. Frank, Joint Institute for Nuclear Research, Dubna, Russia) [ 11 ]. A powder weighing 2 g in an aluminum foil cylinder was a sample for neutronographic research.…”

Section: Methodsmentioning

confidence: 99%

Reversible Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

et al. 2022

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The present study was aimed at revealing the influence of the mechanical stress induced by water molecule adsorption on the composition of crystalline phases in the ZrO2 + 3 mol% Y2O3-nanoparticles. Three basic methods were used to determine the phase transition: neutron diffraction, Raman microspectroscopic scanning, and X-ray diffraction. The fact of reversible phase-structural β → α transformation and the simultaneous presence of two polymorphic structural modifications (β is the phase of the tetragonal syngony and α of monoclinic syngony in nanosized particles (9 nm)) under normal physical conditions was established by these methods. An assumption was made regarding the connection of the physical mechanism of transformation of the extremely nonequilibrium surface of nanoparticles with electronic exchange of the material of the near-surface layer of nanoparticles with the adsorption layer through donor–acceptor interaction. The principal possibility of creating direct-acting hydroelectric converters based on nanoscale YSZ (Yttria-Stabilized Zirconia) systems due to the reversible character of the considered effect was shown.

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“…Neutron diffraction experiments were carried out on the diffractometer DN-2, located on a high-flux pulsed neutron reactor IBR-2 (LNP named I.M. Frank, JINR, Dubna RF) [25]. The diffraction patterns were measured at a scattering angle of 2θ = 174°.…”

Section: Methodsmentioning

confidence: 99%

Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

Asgerov¹,

Beskrovnyy²,

Doroshkevich³

et al. 2021

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The present study was aimed at revealing the influence of the mechanical stress induced by water molecules adsorption on the composition of crystalline phases in the ZrO2–3mol%Y2O3-nanoparticles. Three basic methods have been used to determine the phase transition: neutron diffraction, Raman microspectroscopic scanning, and X-ray diffraction. The fact of phase-structural β → α transformation and the simultaneous presence of two polymorphic structural modifications (β is the phase of the tetragonal syngony and α of monoclinic syngony in nanosized particles (9nm)) under normal physical conditions was established by these methods. Satisfactory consistency was achieved between the results obtained using different techniques.

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Neutron diffractometer for real-time studies of transient processes at the IBR-2 pulsed reactor

Cited by 29 publications

References 12 publications

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

Reversible Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

Martensitic Phase Transition in Yttrium-Stabilized ZrO2 Nanopowders by Adsorption of Water

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