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Structure and Properties of EuZnGa
Author(s) -
Pöttgen Rainer,
Kotzyba Gunter,
Schappacher Falko M.,
Mosel Bernd D.,
Eckert Hellmut,
Grin Yuri
Publication year - 2001
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 - 10.1002/1521-3749(200106)627:6<1299::aid-zaac1299>3.0.co;2-k
Subject(s) - magnetic susceptibility , magnetic moment , magnetization , crystallography , hyperfine structure , electrical resistivity and conductivity , chemistry , diffractometer , spin glass , materials science , condensed matter physics , crystal structure , magnetic field , atomic physics , physics , engineering , quantum mechanics , electrical engineering
New ternary gallide EuZnGa was synthesized by reaction of the elements in a sealed tantalum tube at 1320 K and subsequent annealing at 970 K for seven days. EuZnGa was investigated by X‐ray diffraction on both powders and single crystals. Its structure was refined from single crystal diffractometer data: KHg 2 type, space group Imma , a = 461.7(2), b = 761.4(3), c = 777.0(3) pm, R = 0.041 for 486 structure factors and 13 variables. The zinc and gallium atoms statistically occupy the mercury position of the KHg 2 type of structure. No long‐range ordering between the zinc and gallium atoms could be detected from the X‐ray data. Magnetic susceptibility measurements show Curie‐Weiss behavior above 50 K with a magnetic moment of μ exp = 7.86(5) μ B /Eu and θ = 17(2) K, suggesting divalent europium. Low‐field, low‐temperature susceptibility measurements indicate cluster glass behavior (mictomagnetism) with a freezing temperature of 24(2) K. Magnetization measurements show a magnetic moment of 4.9(1) μ B /Eu at 2 K and a magnetic flux density of 5.5 T. Electrical resistivity data indicate metallic behavior. 151 Eu Mössbauer spectroscopic measurements show onset of magnetic hyperfine splitting at ≤ 17.0 K. Down to the temperature of 4.2 K the spectra reflect magnetic relaxation effects suggesting the presence of a substantial extent of disordering. This observation is consistent with the cluster glass behavior as evident from the magnetic susceptibility data and may be a consequence of the presence of multiple local Eu sites as expected from the statistical Zn and Ga distribution over the corresponding sites in the KHg 2 structure.