In-situ time-of-flight neutron diffraction of ErD2 (beta phase) formation during D2 loading.

Browning, James Frederick (Oak Ridge National Laboratory, Oak Ridge, TN) ; Llobet, Anna (Los Alamos National Laboratory, Los Alamos, NM) ; Snow, Clark Sheldon ; Rodriguez, Mark Andrew ; Wixom, Ryan R.

关键词: DEUTERIDES;    DEUTERIUM;    ERBIUM;    FLUORITE;    HYDROGEN;    NEUTRON DIFFRACTION;    OCCUPATIONS;    PUMPING;    TARGETS Diffraction;    Neutrons-Diffraction.;    Erbium tritides.;   

DOI  :  10.2172/974400
RP-ID  :  SAND2008-3737
PID  :  OSTI ID: 974400
Others  :  TRN: US201009%%65

学科分类：再生能源与代替技术

美国|英语

来源: SciTech Connect

【 摘 要 】

In an effort to better understand the structural changes occurring during hydrogen loading of erbium target materials, we have performed D{sub 2} loading of erbium metal (powder) with simultaneous neutron diffraction analysis. This experiment tracked the conversion of Er metal to the {alpha} erbium deuteride (solid-solution) phase and then on to the {beta} (fluorite) phase. Complete conversion to ErD{sub 2.0} was accomplished at 10 Torr D{sub 2} pressure with deuterium fully occupying the tetrahedral sites in the fluorite lattice. Increased D{sub 2} pressure (up to 500 Torr at 450 C) revealed {approx}10 % deuterium occupation of the octahedral sites. Subsequent vacuum pumping of the sample at 450 C removed octahedral site occupancy while maintaining tetrahedral deuterium occupancy, thereby yielding stoichiometric ErD{sub 2.0} {beta} phase.