La15NbxGe9: a superstructure of the Mn5Si3 structure type with interstitial Nb atoms

J. Bławat; M. Roman; Weiwei Xie; R. J. Cava; T. Klimczuk

doi:10.1016/j.jssc.2018.05.007

La₁₅Nb_xGe₉: a superstructure of the Mn₅Si₃ structure type with interstitial Nb atoms

J. Bławat, M. Roman, Weiwei Xie, R. J. Cava, T. Klimczuk

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The crystal structure and elementary properties of La₁₅Nb_xGe₉ are reported. Single-crystal X-ray diffraction, from a crystallite with only 0.12 Nb/formula unit, reveals that this compound, although transition metal deficient, crystallizes in a hexagonal “15-1-9”-like structure type, space group P6₃mc (no. 186) with lattice parameters a = b = 15.5017(2) Å, c = 6.9173(2) Å. The physical properties were examined by specific heat and resistivity measurements. La₁₅Nb_0.4Ge₉ shows metallic behavior, and no superconductivity is observed above 0.4 K. The Sommerfeld coefficient (γ = 62.41(8) mJ mol⁻¹ K⁻²) and the Debye temperature (θ_D = 267(1) K) were estimated from a fit to the low temperature heat capacity data. La₁₅Nb_0.4Ge₉ is the first reported compound in the ternary La-Nb-Ge system.

Original language	English (US)
Pages (from-to)	50-54
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	265
DOIs	https://doi.org/10.1016/j.jssc.2018.05.007
State	Published - Sep 2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Keywords

Crystal structure determination
Heat capacity
Intermetallic compounds
Resistivity

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10.1016/j.jssc.2018.05.007

Cite this

@article{92d76ab0dbf8400e8a81afe0637d8734,

title = "La15NbxGe9: a superstructure of the Mn5Si3 structure type with interstitial Nb atoms",

abstract = "The crystal structure and elementary properties of La15NbxGe9 are reported. Single-crystal X-ray diffraction, from a crystallite with only 0.12 Nb/formula unit, reveals that this compound, although transition metal deficient, crystallizes in a hexagonal “15-1-9”-like structure type, space group P63mc (no. 186) with lattice parameters a = b = 15.5017(2) {\AA}, c = 6.9173(2) {\AA}. The physical properties were examined by specific heat and resistivity measurements. La15Nb0.4Ge9 shows metallic behavior, and no superconductivity is observed above 0.4 K. The Sommerfeld coefficient (γ = 62.41(8) mJ mol−1 K−2) and the Debye temperature (θD = 267(1) K) were estimated from a fit to the low temperature heat capacity data. La15Nb0.4Ge9 is the first reported compound in the ternary La-Nb-Ge system.",

keywords = "Crystal structure determination, Heat capacity, Intermetallic compounds, Resistivity",

author = "J. B{\l}awat and M. Roman and Weiwei Xie and Cava, {R. J.} and T. Klimczuk",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Inc.",

year = "2018",

month = sep,

doi = "10.1016/j.jssc.2018.05.007",

language = "English (US)",

volume = "265",

pages = "50--54",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - La15NbxGe9

T2 - a superstructure of the Mn5Si3 structure type with interstitial Nb atoms

AU - Bławat, J.

AU - Roman, M.

AU - Xie, Weiwei

AU - Cava, R. J.

AU - Klimczuk, T.

PY - 2018/9

Y1 - 2018/9

N2 - The crystal structure and elementary properties of La15NbxGe9 are reported. Single-crystal X-ray diffraction, from a crystallite with only 0.12 Nb/formula unit, reveals that this compound, although transition metal deficient, crystallizes in a hexagonal “15-1-9”-like structure type, space group P63mc (no. 186) with lattice parameters a = b = 15.5017(2) Å, c = 6.9173(2) Å. The physical properties were examined by specific heat and resistivity measurements. La15Nb0.4Ge9 shows metallic behavior, and no superconductivity is observed above 0.4 K. The Sommerfeld coefficient (γ = 62.41(8) mJ mol−1 K−2) and the Debye temperature (θD = 267(1) K) were estimated from a fit to the low temperature heat capacity data. La15Nb0.4Ge9 is the first reported compound in the ternary La-Nb-Ge system.

AB - The crystal structure and elementary properties of La15NbxGe9 are reported. Single-crystal X-ray diffraction, from a crystallite with only 0.12 Nb/formula unit, reveals that this compound, although transition metal deficient, crystallizes in a hexagonal “15-1-9”-like structure type, space group P63mc (no. 186) with lattice parameters a = b = 15.5017(2) Å, c = 6.9173(2) Å. The physical properties were examined by specific heat and resistivity measurements. La15Nb0.4Ge9 shows metallic behavior, and no superconductivity is observed above 0.4 K. The Sommerfeld coefficient (γ = 62.41(8) mJ mol−1 K−2) and the Debye temperature (θD = 267(1) K) were estimated from a fit to the low temperature heat capacity data. La15Nb0.4Ge9 is the first reported compound in the ternary La-Nb-Ge system.

KW - Crystal structure determination

KW - Heat capacity

KW - Intermetallic compounds

KW - Resistivity

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