Abstract
We prepared a new binary lanthanum germanide, LaGe3, under high-pressure and high-temperature conditions (3-12 GPa, 500-1200 °C). It crystallizes in the BaPb3 structure (the space group R3̄m) with lattice constants of a = 6.376(1) Å, c = 22.272(3) Å, and V = 784.1(2) Å3. We refined the structure using Rietveld analysis from X-ray powder data. The structure is composed of two types of close-packed atom layers. In one layer, every La atom is surrounded solely by Ge atoms with the same distance of 3.188 Å. The other layer contains Ge3 regular, triangular cluster units with a Ge-Ge distance of 2.634 Å. The electron localization function and crystal orbital Hamilton population calculations suggest that the triangular cluster is composed of three Ge-Ge covalent bonds and that each Ge atom has a lone pair. The temperature dependence of the magnetic susceptibility and electrical conductivity measurements revealed that LaGe3 is metallic and shows superconductivity at 7.4 K. This critical temperature is highest for the La-Ge system.
| Original language | English |
|---|---|
| Pages (from-to) | 3901-3906 |
| Number of pages | 6 |
| Journal | Inorganic Chemistry |
| Volume | 50 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 2 2011 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry
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High-pressure synthesis and superconductivity of a new binary lanthanum germanide LaGe3 with triangular Ge3 cluster units. / Fukuoka, Hiroshi; Suekuni, Koichiro; Onimaru, Takahiro; Inumaru, Kei.
In: Inorganic Chemistry, Vol. 50, No. 9, 02.05.2011, p. 3901-3906.Research output: Contribution to journal › Article
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TY - JOUR
T1 - High-pressure synthesis and superconductivity of a new binary lanthanum germanide LaGe3 with triangular Ge3 cluster units
AU - Fukuoka, Hiroshi
AU - Suekuni, Koichiro
AU - Onimaru, Takahiro
AU - Inumaru, Kei
PY - 2011/5/2
Y1 - 2011/5/2
N2 - We prepared a new binary lanthanum germanide, LaGe3, under high-pressure and high-temperature conditions (3-12 GPa, 500-1200 °C). It crystallizes in the BaPb3 structure (the space group R3̄m) with lattice constants of a = 6.376(1) Å, c = 22.272(3) Å, and V = 784.1(2) Å3. We refined the structure using Rietveld analysis from X-ray powder data. The structure is composed of two types of close-packed atom layers. In one layer, every La atom is surrounded solely by Ge atoms with the same distance of 3.188 Å. The other layer contains Ge3 regular, triangular cluster units with a Ge-Ge distance of 2.634 Å. The electron localization function and crystal orbital Hamilton population calculations suggest that the triangular cluster is composed of three Ge-Ge covalent bonds and that each Ge atom has a lone pair. The temperature dependence of the magnetic susceptibility and electrical conductivity measurements revealed that LaGe3 is metallic and shows superconductivity at 7.4 K. This critical temperature is highest for the La-Ge system.
AB - We prepared a new binary lanthanum germanide, LaGe3, under high-pressure and high-temperature conditions (3-12 GPa, 500-1200 °C). It crystallizes in the BaPb3 structure (the space group R3̄m) with lattice constants of a = 6.376(1) Å, c = 22.272(3) Å, and V = 784.1(2) Å3. We refined the structure using Rietveld analysis from X-ray powder data. The structure is composed of two types of close-packed atom layers. In one layer, every La atom is surrounded solely by Ge atoms with the same distance of 3.188 Å. The other layer contains Ge3 regular, triangular cluster units with a Ge-Ge distance of 2.634 Å. The electron localization function and crystal orbital Hamilton population calculations suggest that the triangular cluster is composed of three Ge-Ge covalent bonds and that each Ge atom has a lone pair. The temperature dependence of the magnetic susceptibility and electrical conductivity measurements revealed that LaGe3 is metallic and shows superconductivity at 7.4 K. This critical temperature is highest for the La-Ge system.
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U2 - 10.1021/ic102077k
DO - 10.1021/ic102077k
M3 - Article
C2 - 21446698
AN - SCOPUS:79955382104
VL - 50
SP - 3901
EP - 3906
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 9
ER -