Abstract
The germanide Eu2AuGe3 was obtained as large single crystals in high yield from a reaction of the elements in liquid indium. At room temperature Eu2AuGe3 crystallizes with the Ca 2AgSi3 type, space group Fmmm, an ordered variant of the AlB2 type: a = 857.7(4), b = 1485.5(10), c = 900.2(4) pm. The gold and germanium atoms build up slightly distorted graphite-like layers which consist of Ge6 and Au2Ge4 hexagons, leading to two different hexagonal-prismatic coordination environments for the europium atoms. Magnetic susceptibility data showed Curie-Weiss law behavior above 50 K and antiferromagnetic ordering at 11 K. The experimentally measured magnetic moment indicates divalent europium. The compound exhibits a distinct magnetic anisotropy based on single crystal measurements and at 5 K it shows a metamagnetic transition at ∼10 kOe. Electrical conductivity measurements show metallic behavior. The structural transition at 130 K observed in the single crystal data was very well supported by the conductivity measurements. 151Eu Mössbauer spectroscopic data show an isomer shift of -11.24 mm/s at 77 K, supporting the divalent character of europium. In the magnetically ordered regime one observes superposition of two signals with hyperfine fields of 26.0 (89%) and 3.5 (11%) T, respectively, indicating differently ordered domains.
| Original language | English |
|---|---|
| Pages (from-to) | 9574-9580 |
| Number of pages | 7 |
| Journal | Inorganic Chemistry |
| Volume | 49 |
| Issue number | 20 |
| DOIs | |
| Publication status | Published - Oct 18 2010 |
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ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
Cite this
Indium flux-growth of Eu2AuGe3 : A new germanide with an AlB2 superstructure. / Sebastian, C. Peter; Malliakas, Christos D.; Chondroudi, Maria; Schellenberg, Inga; Rayaprol, Sudhindra; Hoffmann, Rolf Dieter; Pöttgen, Rainer; Kanatzidis, Mercouri G.
In: Inorganic Chemistry, Vol. 49, No. 20, 18.10.2010, p. 9574-9580.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Indium flux-growth of Eu2AuGe3
T2 - A new germanide with an AlB2 superstructure
AU - Sebastian, C. Peter
AU - Malliakas, Christos D.
AU - Chondroudi, Maria
AU - Schellenberg, Inga
AU - Rayaprol, Sudhindra
AU - Hoffmann, Rolf Dieter
AU - Pöttgen, Rainer
AU - Kanatzidis, Mercouri G
PY - 2010/10/18
Y1 - 2010/10/18
N2 - The germanide Eu2AuGe3 was obtained as large single crystals in high yield from a reaction of the elements in liquid indium. At room temperature Eu2AuGe3 crystallizes with the Ca 2AgSi3 type, space group Fmmm, an ordered variant of the AlB2 type: a = 857.7(4), b = 1485.5(10), c = 900.2(4) pm. The gold and germanium atoms build up slightly distorted graphite-like layers which consist of Ge6 and Au2Ge4 hexagons, leading to two different hexagonal-prismatic coordination environments for the europium atoms. Magnetic susceptibility data showed Curie-Weiss law behavior above 50 K and antiferromagnetic ordering at 11 K. The experimentally measured magnetic moment indicates divalent europium. The compound exhibits a distinct magnetic anisotropy based on single crystal measurements and at 5 K it shows a metamagnetic transition at ∼10 kOe. Electrical conductivity measurements show metallic behavior. The structural transition at 130 K observed in the single crystal data was very well supported by the conductivity measurements. 151Eu Mössbauer spectroscopic data show an isomer shift of -11.24 mm/s at 77 K, supporting the divalent character of europium. In the magnetically ordered regime one observes superposition of two signals with hyperfine fields of 26.0 (89%) and 3.5 (11%) T, respectively, indicating differently ordered domains.
AB - The germanide Eu2AuGe3 was obtained as large single crystals in high yield from a reaction of the elements in liquid indium. At room temperature Eu2AuGe3 crystallizes with the Ca 2AgSi3 type, space group Fmmm, an ordered variant of the AlB2 type: a = 857.7(4), b = 1485.5(10), c = 900.2(4) pm. The gold and germanium atoms build up slightly distorted graphite-like layers which consist of Ge6 and Au2Ge4 hexagons, leading to two different hexagonal-prismatic coordination environments for the europium atoms. Magnetic susceptibility data showed Curie-Weiss law behavior above 50 K and antiferromagnetic ordering at 11 K. The experimentally measured magnetic moment indicates divalent europium. The compound exhibits a distinct magnetic anisotropy based on single crystal measurements and at 5 K it shows a metamagnetic transition at ∼10 kOe. Electrical conductivity measurements show metallic behavior. The structural transition at 130 K observed in the single crystal data was very well supported by the conductivity measurements. 151Eu Mössbauer spectroscopic data show an isomer shift of -11.24 mm/s at 77 K, supporting the divalent character of europium. In the magnetically ordered regime one observes superposition of two signals with hyperfine fields of 26.0 (89%) and 3.5 (11%) T, respectively, indicating differently ordered domains.
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U2 - 10.1021/ic101340a
DO - 10.1021/ic101340a
M3 - Article
C2 - 20836517
AN - SCOPUS:78549243806
VL - 49
SP - 9574
EP - 9580
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 20
ER -