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arXiv 2001.11251cond-mat.mtrl-sci
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Sc5Rh6Sn18的晶体结构、化学键、电输运和热输运

Crystal structure, Chemical Bonding, Electrical and Thermal Transport in Sc5Rh6Sn18

Manuel Feig, Lev Akselrud, Walter Schnelle, Vadim Dyadkin, Dmitry Chernyshov, Alim Ormeci, Paul Simon, Andreas Leithe-Jasper, Roman Gumeniuk

摘要:

从Sn助熔剂中生长了Sc_5 Rh_6Sn_(18)单晶。晶体结构(SG:I41/acd,a = 13.5529(2)nm,c = 27.0976(7)nm)。所有的方法都证实它是Sc_5Ir_6Sn_(18)(空间群I41/acd)型晶体。进行的结构研究表明,也存在局部域的平均平移对称性破缺。化学键合情况的分析揭示了高极性的Sc2-Sn 1,Sn-Rh和Sc2-Rh键,涉及Sn原子的两个和三个中心键以及Sc 1键合的离子性质。Sc 5 Rh 6Sn 18的热电势是各向同性的、小的和负的(即,类电子载流子占主导地位)。由于结构无序,与常规金属系统相比,热导率降低。

英文摘要:

Single crystals of Sc5Rh6Sn18 were grown from Sn-flux. The crystal structure (SG: I41/acd, a = 13.5529(2) Å, c = 27.0976(7) Å) was studied by high-resolution X-ray diffraction on powder and single crystal material as well as by TEM. All methods confirm it to crystallize with Sc5Ir6Sn18 (space group I41/acd) type of structure. The performed structural studies suggest also the presence of local domains with broken average translational symmetry. Analysis of the chemical bonding situation reveal highly polar Sc2-Sn1, Sn-Rh and Sc2-Rh bonds, two- and three-center bonds involving Sn-atoms as well as ionic nature of Sc1 bonding. The thermopower of Sc5Rh6Sn18 is isotropic, small and negative (i.e. dominance of electron-like charge carriers). Due to structural disorder, the thermal conductivity is lowered in comparison with regular metallic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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