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Quaternary Germanide Arsenides ZrCuGeAs and HfCuGeAs
Author(s) -
Baergen Alyson M.,
Blanchard Peter E. R.,
Stoyko Stanislav S.,
Mar Arthur
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100238
Subject(s) - germanide , tetragonal crystal system , crystallography , diffraction , powder diffraction , paramagnetism , x ray photoelectron spectroscopy , crystal structure , materials science , covalent bond , chemistry , x ray crystallography , nuclear magnetic resonance , physics , condensed matter physics , metallurgy , germanium , silicon , optics , organic chemistry
The quaternary germanide arsenides ZrCuGeAs and HfCuGeAs were prepared by reaction of “ZrCuGe” or “HfCuGe” precursor materials with As at 800 °C. They are new representatives of the ZrCuSiAs‐type structure (tetragonal, space group P 4/ nmm , Z = 2, Pearson symbol tP 8), as determined by single‐crystal X‐ray diffraction on ZrCuGeAs ( a = 3.7155(2) Å, c = 9.5644(6) Å) and powder X‐ray diffraction on HfCuGeAs ( a = 3.6935(3) Å, c = 9.5557(9) Å). They belong in the small category of ZrCuSiAs‐type compounds exhibiting strong covalent bonding in three dimensions, as reflected in their location in a structure map and as confirmed by band structure calculations. X‐ray photoelectron spectroscopy provides evidence for anionic As atoms. Both compounds exhibit temperature‐independent Pauli paramagnetism.