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A New Ternary Arsenide LaNi5As3: Preparation and Crystal Structure
-
Volodymyr Babizhetskyy
and
Arndt Simon
Published/Copyright:
June 2, 2014
Abstract
The title compound was prepared from the elements by arc-melting followed by annealing in silica tubes at 1070 K for 3 months. The orthorhombic structure of LaNi5As3 was solved and refined from X-ray single crystal data: space group Pnma, a = 11.179(2), b = 3.9133(5), c = 24.443(3) Å , Z = 8, R = 0.040, Rw = 0.039 for 1045 unique reflections with I > 2σ (I) and 110 parameters. It is a new structure type, which can be described by condensed units of trigonal prisms around the arsenic atoms linked together to infinite zigzag chains. The structural features of LaNi5As3 are discussed in comparison with some representatives of a large family of structures with a metal/non-metal ratio equal or close to 2:1.
Received: 2004-6-2
Published Online: 2014-6-2
Published in Print: 2004-10-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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