A laboratory-based Laue X-ray diffraction system for enhanced imaging range and surface grain mapping

Whitley, W. T.; Stock, Chris; Huxley, A.

doi:10.1107/s1600576715009097

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…DC Magnetic Susceptibility: A 7.7 mg single crystal of α-CoV 3 O 8 with dimensions of 2 × 1 × 1 mm 3 was aligned along the three principal axes. All crystal alignments were performed with polychromatic Laue backscattering diffraction employing adapted photostimulable plates using the Fujifilm FCR Capsula XL II system 66 . The temperature dependence of ZFC magnetization for all three principal axes was measured on a Quantum Design MPMS in an external DC field µ o H ext = 0.5 T applied parallel to the particular axis of interest.…”

Section: Methodsmentioning

confidence: 99%

Ordered magnetism in the intrinsically decorated jeff=12α−CoV3O8

et al. 2018

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The antiferromagnetic mixed valence ternary oxide α-CoV3O8 displays disorder on the Co 2+ site that is inherent to the Ibam space group resulting in a local selection rule requiring one Co 2+ and one V 4+ reside next to each other, thus giving rise to an intrinsically disordered magnet without the need for any external influences such as chemical dopants or porous media. The zero field structural and dynamic properties of α-CoV3O8 have been investigated using a combination of neutron and x-ray diffraction, DC susceptibility, and neutron spectroscopy. The low temperature magnetic and structural properties are consistent with a random macroscopic distribution of Co 2+ over the 16k metal sites. However, by applying the sum rules of neutron scattering we observe the collective magnetic excitations are parameterized with an ordered Co 2+ arrangement and critical scattering consistent with a three dimensional Ising universality class. The low energy spectrum is well-described by Co 2+ cations coupled via a three dimensional network composed of competing ferromagnetic and stronger antiferromagnetic superexchange within the ab plane and along c, respectively. While the extrapolated Weiss temperature is near zero, the 3D dimensionality results in long range antiferromagnetic order at T N ∼ 19 K. A crystal field analysis finds two bands of excitations separated in energy at ω ∼ 5 meV and 25 meV, consistent with a j eff = 1 2 ground state with little mixing between spin-orbit split Kramers doublets. A comparison of our results to the random 3D Ising magnets and other compounds where spin-orbit coupling is present indicate that the presence of an orbital degree of freedom, in combination with strong crystal field effects and well-separated j eff manifolds may play a key role in making the dynamics largely insensitive to disorder.

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Section: Methodsmentioning

confidence: 99%

Ordered magnetism in the intrinsically decorated jeff=12α−CoV3O8

et al. 2018

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“…Single-crystals were grown using the Czochralski method, with crystals pulled from the melt using a rotating tungsten needle 27 . The resulting growth was grain mapped using X-ray Laue diffraction 28 , and a single-crystal was iso-lated, orientated, and electrical discharge machined (EDM) using a fine, high purity, Cu wire under paraffin oil. The samples were then re-annealed to ensure full site ordering.…”

Section: Sample Preparationmentioning

confidence: 99%

High-pressure neutron diffraction study of Pd3Fe

Ridley

Bull

Funnell

et al. 2019

Journal of Applied Physics

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High-pressure neutron diffraction data from powder and single-crystal samples of atomically disordered (Fm3m) and ordered (Pm3m) Pd 3 Fe were collected up to pressures of 15 GPa, and high-pressure SQUID magnetometry data were collected up to 6 GPa. The data show a subtle decrease in the magnetic moment with applied pressure, resulting in a transition to a paramagnetic state by approximately 8 GPa at 300 K. Diffraction results have been used to determine the equation of state, resulting in a bulk modulus of 176.78(9) GPa for the disordered powder and 187.96(7) GPa for the ordered single-crystal samples respectively, approximately 20% more compressible than previously reported from X-ray measurements. High-temperature SQUID magnetometry was used to confirm the ambient pressure Curie temperature of the sample (545 K), which was further investigated using high-temperature single-crystal neutron diffraction at ambient pressure.

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“…Many methods for achieving phase contrast imaging, such as X-ray interferometry [16,21,22], diffraction-enhanced imaging [15,[23][24][25][26], and propagation-based imaging [27][28][29][30][31][32], are available, and each method has its own characteristics and advantages. Most of these methods, except propagation-based imaging, require nearly perfect optical elements and monochromatic X-rays to realize phase contrast.…”

Section: Two-dimensional Characteristic Microstructures Of Cmmsmentioning

confidence: 99%

Microscopic identification of Chinese medicinal materials based on X-ray phase contrast imaging: from qualitative to quantitative

et al. 2016

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JINST 11 C07001phase contrast micro-CT for investigating the characteristic microstructures of CMMs. During this period, a variety of typical CMMs have been investigated, from two-dimensional (2D) radiography to three-dimensional (3D) micro-CT, from qualitative to quantitative. Taken together, these results verify that quantitative X-ray phase contrast micro-CT is a practical tool for the microscopic investigation of CMMs. Additionally, further efforts are being made to find the relationship between the microstructures' quantitative factors and active chemical components. At present, experimental results have demonstrated that the quality of CMMs can be evaluated directly via the quantitative information of their characteristic microstructures. K: Computerized Tomography (CT) and Computed Radiography (CR); X-ray radiography and digital radiography (DR)

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A laboratory-based Laue X-ray diffraction system for enhanced imaging range and surface grain mapping

Cited by 6 publications

References 5 publications

Ordered magnetism in the intrinsically decorated jeff=12α−CoV3O8

Ordered magnetism in the intrinsically decorated jeff=12α−CoV3O8

High-pressure neutron diffraction study of Pd3Fe

Microscopic identification of Chinese medicinal materials based on X-ray phase contrast imaging: from qualitative to quantitative

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