Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System
Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System
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研究过又忘记了。
DOI:
10.1002/zaac.202000133
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Bobev, Svilen
中科院分区:
文献类型:
--
作者:
Ovchinnikov, Alexander;Bobev, Svilen
The crystal structure of the ternary germanide Li2MnGe has been re‐evaluated from single‐crystal X‐ray diffraction data. This compound crystallizes in a non‐centrosymmetric superstructure of the ZrCuSiAs type (space groupP4bm, Pearson codetP16), with the lattice parametersa= 6.088(4) Å,c= 6.323(4) Å. First‐principle calculations for the idealized structure predict antiferromagnetic exchange in the square Mn nets and semimetallic ground state. In addition, a new ternary phase with the composition Li2–xMn4+xGe5(x≈ 1.2) was discovered. It adopts the V6Si5structure type (space groupIbam, Pearson codeoI44), with the lattice parametersa= 7.570(2) Å,b= 16.323(3) Å,c= 5.057(1) Å. DSC/TG measurements show that this compound is thermally stable below 995 K.
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