Low-temperature plasticity and lattice dynamics of solid parahydrogen with an isotopic impurity

Алексеева, Л. А.; Syrkin, E. S.; Vashchenko, L. A.

doi:10.1134/1.1583792

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Other experiments have concentrated on the mechanical properties of hydrogen crystals. Anomalous plasticity and creep of solid hydrogen samples have been observed below ∼5 K, and found to be quite sensitive to crystal quality and purity [20,21,22,23]. However, these very interesting investigations have been limited to stresses amplitudes (σ > 500 Pa) much higher than in TO measurements (between 20 and 400 mPa in this work) and T > 1 K, where quantum diffusion of o-H 2 impurities does not lead to clustering.…”

Section: Introductionmentioning

confidence: 94%

Influence of Ortho-H2 Clusters on the Mechanical Properties of Solid Para-H2

et al. 2009

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The quantum diffusion of ortho-H 2 impurities in solid para-H 2 has been investigated with a torsional oscillator technique. The unclustering dynamics of agglomerated impurities with increasing temperature are found to greatly affect the resonant period of oscillation. Based on the observed trends in both experimental data and complementary finite element calculations, we find that the oscillation period predominantly reflects changes in the solid's elastic response to the minute inertial stresses imposed on it. It is likely that the small but abrupt increase in the resonant period observed above 100 mK in high purity H 2 samples is due to the interplay between remnant ortho-H 2 impurities and dislocations, and not a signature of a supersolid to normal solid transition.

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Section: Introductionmentioning

confidence: 94%

Influence of Ortho-H2 Clusters on the Mechanical Properties of Solid Para-H2

et al. 2009

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“…его пластичность существенно увеличивается [33,34]. Наличие в водороде даже небольших изотопических добавок (HD или D 2 ) может привести к охрупчиванию и разрушению образца [35,36]. Любые примеси, особенно азот, де-лают дейтерий хрупким, и экструзия оказывается невозможной [18].…”

Section: проблемы изготовления цилиндрической криогенной топливной миunclassified

Cryogenic Hydrogen Fuel for Controlled Inertial Confinement Fusion (Cylindrical Targets for the Laplas Experiments)

Александрова¹,

Koresheva²,

Koshelev³

et al. 2016

PAST-TF

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Для проведения экспериментов по программе инерциального термоядерного синтеза (ИТС) в схеме LAPLAS на установке FAIR с тяжелоионным драйвером требуются цилиндрические мишени с криогенным топливным ядром. В данной статье представлен подробный анализ проблемы производства и доставки таких мишеней в центр экспериментальной камеры. Предложена кон-цепция специализированного устройства на основе бесподвесного подхода для частотного пополнения экспериментов LAPLAS цилиндрическими криогенными мишенями.Ключевые слова: инерциальный термоядерный синтез (ИТС), бесподвесный подход (FST), криогенное водородное топливо. In inertial confinement fusion (ICF) research, cylindrical cryogenic targets are required to carry out the experiments according to LAPLAS scheme on FAIR facility. In this paper, a thorough analysis of the problem of such targets fabrication, delivery and positioning in the center of the experimental chamber has been made. Based on free-standing target approach, particular attention is paid to the issue of a specialized cryogenic system development intended for rep-rate supply of the LAPLAS experiments with the cylindrical cryogenic targets. CRYOGENIC HYDROGEN FUEL FOR CONTROLLED INERTIAL CONFINEMENT FUSION (CYLINDRICAL TARGETS FOR THE LAPLAS EXPERIMENTS)

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“…Isotopic impurities affect considerably the quantum nature of hydrogen crystal flow. Unlike the soft pure material, p-H 2 doped with its stable deuterium isotope exhibit a considerable strengthening and a much lower plasticity [4,5,8]. Some other intriguing findings [6,9] on very pure p-H 2 were tentatively interpreted as being related with large-scale planar defects**, viz., pseudotwins [9,10].…”

Section: Introductionmentioning

confidence: 99%

Plasticity of parahydrogen with reduced deuterium contents

Алексеева

2007

Low Temperature Physics

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The plasticity of solid parahydrogen with lowered deuterium contents under step-wise uniaxial extension at liquid helium temperatures 1.8-4.2 K has been investigated. Work hardening curves for single crystals have been measured. Maximum possible values of sample's elongation without their fracture at minimum stress values have been reached. Features of super-plastic irreversible deformation of samples were observed. Anomalous temperature dependence of deformation parameters has been found. The character of this anomaly exhibits evidence of the coherent motion of dislocation kinks in Pierls relief, modified by residual ortho-and deuterium impurities.

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Low-temperature plasticity and lattice dynamics of solid parahydrogen with an isotopic impurity

Cited by 4 publications

References 7 publications

Influence of Ortho-H2 Clusters on the Mechanical Properties of Solid Para-H2

Influence of Ortho-H2 Clusters on the Mechanical Properties of Solid Para-H2

Cryogenic Hydrogen Fuel for Controlled Inertial Confinement Fusion (Cylindrical Targets for the Laplas Experiments)

Plasticity of parahydrogen with reduced deuterium contents

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