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- W2020238368 abstract "A new intermetallic deuteride Ce2Ni7D4.7 with an anomalous volume expansion has been studied. Its structure was solved on the basis of in situ neutron diffraction data. Expansion proceeds along the c-axis and within the CeNi2 slabs only. All D atoms are located inside these slabs and on the border between CeNi2 and CeNi5. Ordering of D atoms in the bulk of CeNi2 is accompanied by substantial deformation of these slabs thus lowering the hexagonal symmetry to orthorhombic [space group Pmcn (No. 62); a=4.9251(3) Å, b=8.4933(4) Å, c=29.773(1) Å]. Inside the CeNi2 layer the hydrogen sublattice is completely ordered; all D–D distances exceed 2.0 Å. Local coordination of Ni by D inside the CeNi2 blocks is of “open”, saddle-like type. Hydrogen ordering is mainly determined by Ce–H and H–H interactions. The pressure–composition–temperature measurements yielded the following thermodynamic parameters of the formation of the hydride: ΔH=−22.4 kJ/molH, ΔS=−59.9 J/(K molH)." @default.
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- W2020238368 date "2007-09-01" @default.
- W2020238368 modified "2023-10-12" @default.
- W2020238368 title "Crystal chemistry and thermodynamic properties of anisotropic Ce2Ni7H4.7 hydride" @default.
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- W2020238368 doi "https://doi.org/10.1016/j.jssc.2007.07.002" @default.
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