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High‐Pressure Synthesis and Physical Properties of the Europium‐Substituted Barium Clathrate Ba 8− x Eu x Ge 43 □ 3 ( x ≤ 0.6)
Author(s) -
Demchyna R.,
Köhler U.,
Prots Yu.,
Schnelle W.,
Baenitz M.,
Burkhardt U.,
Paschen S.,
Schwarz Ulrich
Publication year - 2006
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.200500343
Subject(s) - europium , clathrate hydrate , electrical resistivity and conductivity , barium , paramagnetism , magnetic susceptibility , crystallography , crystal structure , bar (unit) , powder diffraction , chemistry , materials science , ion , condensed matter physics , hydrate , inorganic chemistry , physics , organic chemistry , quantum mechanics , meteorology
The new clathrate Ba 8– x Eu x Ge 43 □ 3 ( x = 0.6) was synthesized at a pressure of 1 GPa and temperatures of up to 1220 K by means of a multi‐anvil device (Walker module) and a hydraulic 1000 ton press. X‐ray powder diffraction data indicate that the crystal structure of Ba 8– x Eu x Ge 43 □ 3 ( x = 0.6, space group $Ia{\bar 3}d$ , a = 21.2588(3) Å) corresponds to that of Ba 8 Ge 43 □ 3 . Measurements of the magnetic susceptibility of Ba 8– x Eu x Ge 43 □ 3 reveal Curie‐paramagnetic behaviour and prove that the electronic state of europium corresponds to 4 f 7 , i.e., Eu 2+ . Electrical resistivity shows a metal‐like temperature dependence and ρ (300) ≈ 2mΩ cm for x = 0.6. Heat capacity measurements reveal an upturn of c p / T(T) below 7 K that is attributed to magnetic interaction of the europium ions.