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2021-04-10
11:28
OpenAccess [FZJ-2021-01626] Journal Article
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Revealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons
Polarized neutron diffraction (PND) is a powerful technique to distinguish a weak magnetic contribution from the total scattering intensity. It can provide a detailed insight into the microscopic spin ordering at the unit cell level, but also into the mesoscopic magnetic ordering, like different types of domain populations. [...]
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2021-04-10
11:28
OpenAccess [FZJ-2021-01551] Journal Article
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Grazing Incidence Small-Angle Neutron Scattering: Background Determination and Optimization for Soft Matter Samples
Applied Sciences 11(7), 3085 - () [10.3390/app11073085]
Grazing incidence small-angle neutron scattering (GISANS) provides access to interfacial properties, e.g., in soft matter on polymers adsorbed at a solid substrate. Simulations in the frame of the distorted wave Born approximation using the BornAgain software allow to understand and quantify the scattering pattern above and below the sample horizon, in reflection and transmission, respectively. [...]
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2021-04-04
21:29
DBCoverage [IMPULSE-2021-00254] Journal Article
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Radiation Damage of Reactor Pressure Vessel Steels Studied by Positron Annihilation Spectroscopy—A Review
Metals 10(10), 1378 - () [10.3390/met10101378]
Safe and long term operation of nuclear reactors is one of the most discussed challenges in nuclear power engineering. The radiation degradation of nuclear design materials limits the operational lifetime of all nuclear installations or at least decreases its safety margin. [...]
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2021-04-04
21:26
[IMPULSE-2021-00253] Journal Article
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Defect accommodation in off-stoichiometric (SrTiO$_3$)$_n$SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy
Applied physics letters 117(6), 062901 - () [10.1063/5.0011136]
The low dielectric loss underlying the record performance of strained (SrTiO3)nSrO Ruddlesden–Popper films as tunable microwave dielectrics was postulated to arise from (SrO)2 faults accommodating local non-stoichiometric defects. Here, we explore the effect of non-stoichiometry on (SrTiO3)nSrO using positron annihilation lifetime spectroscopy on a composition series of 300 nm thick n = 6 (Sr1+δTiO3)nSrO thin films. [...]

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2021-04-04
21:22
[IMPULSE-2021-00252] Journal Article
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Positron Annihilation Studies of Reactor Pressure Vessel Steels Treated by Hydrogen Ion Implantation
Long term operation of nuclear reactors is one of the most discussed challenges in nuclear power engineering.Radiation degradation of nuclear materials limits the operational lifetime of all nuclear installations or at leastdecreases its safety margin. This paper is focused on experimental simulation and evaluation of materials viahydrogen ion implantation and on comparison with our previous results obtained from neutron-irradiated samples.In our case, German reactor pressure vessel (RPV) steels, originally from CARINA/CARISMA program, werestudied by positron annihilation lifetime spectroscopy (PALS) and the pulsed low energy positron system (PLEPS)with the aim to study microstructural changes in RPV steels after high level of irradiation [...]
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2021-04-04
21:19
[IMPULSE-2021-00251] Journal Article
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Vacancy cluster growth and thermal recovery in hydrogen-irradiated tungsten
The thermal evolution of vacancies and vacancy clusters in tungsten (W) has been studied. W (100) single crystals were irradiated with 200 keV hydrogen (H) ions to a low damage level ( dpa) at 290 K and then annealed at temperatures in the range of 500–1800 K. [...]

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2021-04-04
21:12
[IMPULSE-2021-00250] Journal Article
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In-Situ High-Energy X-ray Diffraction During a Linear Deposition of 308 Stainless Steel via Wire Arc Additive Manufacture
Adoption of metal additive manufacturing (AM) components in property-critical applications requires predictable performance of fabricated metal AM parts. In-situ diagnostics coupled with material models provide a pathway for qualification of AM whereby a prime objective is to capture data that inform or validate models or theory. [...]

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2021-03-31
21:31
[IMPULSE-2021-00249] Journal Article
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Stripe Discommensuration and Spin Dynamics of Half-Doped Pr$_{3/2}$Sr$_{1/2}$NiO$_4$
We present inelastic neutron scattering measurements of magnetic excitations in stripe ordered Pr3/2Sr1/2NiO4 at T∼10 K. For the observed magnetic incommensurability ε = 0.4, we have incorporated a stripe discommensuration model in our linear spin wave calculation and obtained best agreement with the measured spin wave dispersion, especially to explain the symmetrical outward shift of the magnetic peaks from Néel ordered zone center in energy range 35 to 45 meV. [...]
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2021-03-31
14:13
DBCoverage [IMPULSE-2021-00248] Journal Article
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Sequential ion irradiations on Fe-Cr and ODS Fe-Cr alloys
Oxide dispersion strengthened steels are candidate materials for nuclear reactor applications due to a powerful combination of properties, such as reduced activation, high-temperature strength and increased creep resistance. The dispersion of nanometric oxide particles in the steel matrix may also enhance radiation resistance by acting as trapping sites for irradiation induced defects. [...]
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2021-03-31
13:26
[IMPULSE-2021-00247] Journal Article
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Neurosensory and Sinus Evolution as Tyrannosauroid Dinosaurs Developed Giant Size: Insight from the Endocranial Anatomy of Bistahieversor sealeyi
The anatomical record / B 303(4), 1043 - 1059 () [10.1002/ar.24374]
Tyrannosaurus rex and other tyrannosaurid dinosaurs were apex predators during the latest Cretaceous, which combined giant size and advanced neurosensory systems. Computed tomography (CT) data have shown that tyrannosaurids had a trademark system of a large brain, large olfactory bulbs, elongate cochlear ducts, and expansive endocranial sinuses surrounding the brain and sense organs [...]
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