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Title: The crystal structure, electronic, and magnetic properties of NaPd{sub 3}Ge{sub 2}

Highlights: • Correct crystal structure of NaPd{sub 3}Ge{sub 2} is solved by single crystal X-ray diffraction. • NaPd{sub 3}Ge{sub 2} is found to crystallize in the ErRh{sub 3}Si{sub 2} structure type. • NaPd{sub 3}Si{sub 2}, NaPd{sub 3}Ge{sub 2} and NaPd{sub 3}Sn{sub 2} are found to be metals down to 2 K. • All three compounds show a weak diamagnetic response down to 2 K. • Trend of p-block atom dimer breaking as function of size. - Abstract: Crystals of NaPd{sub 3}X{sub 2}, (X = Si, Ge, Sn) were synthesized and their crystal structures investigated by single crystal X-ray diffraction. The previously reported structures of NaPd{sub 3}Si{sub 2} and NaPd{sub 3}Sn{sub 2} were confirmed. NaPd{sub 3}Ge{sub 2} was found to have a different unit cell from that originally reported; therefore the structure was solved. It is an orthorhombically distorted version of the hexagonal CeCo{sub 3}Be{sub 2}-type structure, in space group Imma, with cell parameters a = 7.244(1) Å, b = 9.938(1) Å, c = 5.767(2) Å. The originally reported cell is explained through triple twinning of the true cell. The structure of NaPd{sub 3}Ge{sub 2} fits the trend of decreasing X–X dimerization as a function of increasing period from Si–Sn. Allmore » three compounds are metals showing weak diamagnetism with increasing resistivity from NaPd{sub 3}Si{sub 2}–NaPd{sub 3}Sn{sub 2}; no superconductivity is observed down to 2 K.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States)
  2. Physik-Institut, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich (Switzerland)
  3. Bruker AXS Inc., Madison, WI 53711 (United States)
Publication Date:
OSTI Identifier:
22475954
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIAMAGNETISM; DIMERS; GERMANIUM COMPOUNDS; ION MICROPROBE ANALYSIS; MAGNETIC PROPERTIES; METALS; MONOCRYSTALS; PALLADIUM COMPOUNDS; SODIUM COMPOUNDS; SPACE GROUPS; SUPERCONDUCTIVITY; TERNARY ALLOY SYSTEMS; TETRAGONAL LATTICES; TWINNING; X-RAY DIFFRACTION