Chalk River Laboratories

About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.

Structural, magnetic, and thermal properties of Ce 1 − x Eu x CrO 3 orthochromite solid solutions

Abstract: The interplay of slight changes of the rare-earth composition and antiferromagnetic ordering of Cr in a series of high purity solid solutions of orthochromites with composition ${\mathrm{Ce}}_{1\ensuremath{-}x}\mathrm{Eu}{}_{x}{\mathrm{CrO}}_{3}\phantom{\rule{4pt}{0ex}}(1\ensuremath{\leqq}x\ensuremath{\leqq}0)$ was investigated by neutron and x-ray powder diffraction, magnetization, and heat capacity measurements. A careful study of the crystal structure by x-ray powder diffraction data across the whole range of $x$ enables us to correlate the magnetic properties of the Cr magnetic subsystem with the size of the lattice and minute changes of the bond and torsion angles within and between the ${\mathrm{CrO}}_{6}$ octahedra. We find that the sizes and the shapes of the ${\mathrm{CrO}}_{6}$ octahedra remain essentially unchanged as the size of the rare-earth cations and the cell volumes are gradually reduced by Eu substitution, whereas decreasing Cr-O-Cr bond angles and increasing inclination of neighboring octahedra compensate for the decreasing lattice size. Adverse to external hydrostatic pressure that reduces the cell volume but raises the ordering temperature, lowering the cell volume by replacing Ce by Eu decreases the N\'eel temperature linearly with the Eu concentration from 260 K for ${\mathrm{CeCrO}}_{3}$ to 178 K for ${\mathrm{EuCrO}}_{3}$.

Quantitative calibration of intense (α, α) elastic scattering resonances for 12C at 5.50–5.80 MeV and for 16O at 7.30–7.65 MeV

Abstract: Extremely strong (α, α) elastic scattering resonances — more than 100 times the Rutherford value — occur in 16O at 7.35–7.65 keV and in 12C at 5.50–5.80 MeV, thus allowing the normal RBS technique to be extended to low-Z components, such as oxygen and carbon. Both resonances have been calibrated over the appropriate 300 keV energy regime with an overall accuracy of ±4%. Some recent examples of their use in profiling oxygen and carbon in various substrates are given.

The Microstructure of Unirradiated and Neutron Irradiated Inconel X750

Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.