Neutron diffraction experiments were initially performed using the BT-1 high-resolution powder diffractometer at the NIST Center for Neutron Research. Powder samples were put in cylindrical v.anadium cans and measured in transmission geometry at λ = 1.5944 Å (calibrated using Na2Ca3Al2F14 as a reference). Rietveld refinement of ex situ neutron diffractions were performed with GSAS software packages.
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