MgPdSb─An Electron-Deficient Half-Heusler Phase

Michał J. Winiarski; Kamila Stolecka; Leszek Litzbarski; Thao T. Tran; Karolina Górnicka; Tomasz Klimczuk

doi:10.1021/acs.jpcc.2c01367

MgPdSb─An Electron-Deficient Half-Heusler Phase

Michał J. Winiarski
, Kamila Stolecka
, Leszek Litzbarski
, Thao T. Tran
, Karolina Górnicka
, Tomasz Klimczuk

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

5 Scopus citations

Abstract

The half-Heusler family consists of many semiconducting intermetallic compounds, virtually all of them having a valence electron count (VEC) of 18. We have studied an electron-deficient (VEC = 17) phase MgPdSb and its Pd-stuffed variant MgPd_1.25Sb. The cubic F4¯ 3m crystal structure was confirmed by the Rietveld refinement of powder X-ray diffraction (XRD) data. The lattice parameter is a = 6.284 and 6.335 Å for MgPdSb and MgPd_1.25Sb, respectively. The Debye temperature and Sommerfeld coefficient for MgPdSb are Θ_D= 282 K and γ= 3.3 mJ mol^-1K^-2, respectively, and are similar to those obtained for MgPd_1.25Sb. There is neither phase transition nor superconductivity observed above 1.8 K. The differences between the electronic structures of Mg-based half-Heusler compounds make them robustly metallic, irrespective of the electron count and the introduction of interstitial transition metal (Pd) atoms.

Original language	English
Pages (from-to)	14229-14235
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	126
Issue number	33
DOIs	https://doi.org/10.1021/acs.jpcc.2c01367
State	Published - Aug 25 2022
Externally published	Yes

Funding

The research at Gdansk University of Technology was supported by the National Science Centre (Poland) grant (UMO-2017/27/B/ST5/03044). T.T.T. thanks Clemson University, College of Science, and Department of Chemistry for support.

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title = "MgPdSb─An Electron-Deficient Half-Heusler Phase",

abstract = "The half-Heusler family consists of many semiconducting intermetallic compounds, virtually all of them having a valence electron count (VEC) of 18. We have studied an electron-deficient (VEC = 17) phase MgPdSb and its Pd-stuffed variant MgPd1.25Sb. The cubic F4¯ 3m crystal structure was confirmed by the Rietveld refinement of powder X-ray diffraction (XRD) data. The lattice parameter is a = 6.284 and 6.335 {\AA} for MgPdSb and MgPd1.25Sb, respectively. The Debye temperature and Sommerfeld coefficient for MgPdSb are ΘD= 282 K and γ= 3.3 mJ mol-1K-2, respectively, and are similar to those obtained for MgPd1.25Sb. There is neither phase transition nor superconductivity observed above 1.8 K. The differences between the electronic structures of Mg-based half-Heusler compounds make them robustly metallic, irrespective of the electron count and the introduction of interstitial transition metal (Pd) atoms.",

author = "Winiarski, \{Micha{\l} J.\} and Kamila Stolecka and Leszek Litzbarski and Tran, \{Thao T.\} and Karolina G{\'o}rnicka and Tomasz Klimczuk",

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doi = "10.1021/acs.jpcc.2c01367",

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T1 - MgPdSb─An Electron-Deficient Half-Heusler Phase

AU - Winiarski, Michał J.

AU - Stolecka, Kamila

AU - Litzbarski, Leszek

AU - Tran, Thao T.

AU - Górnicka, Karolina

AU - Klimczuk, Tomasz

PY - 2022/8/25

Y1 - 2022/8/25

N2 - The half-Heusler family consists of many semiconducting intermetallic compounds, virtually all of them having a valence electron count (VEC) of 18. We have studied an electron-deficient (VEC = 17) phase MgPdSb and its Pd-stuffed variant MgPd1.25Sb. The cubic F4¯ 3m crystal structure was confirmed by the Rietveld refinement of powder X-ray diffraction (XRD) data. The lattice parameter is a = 6.284 and 6.335 Å for MgPdSb and MgPd1.25Sb, respectively. The Debye temperature and Sommerfeld coefficient for MgPdSb are ΘD= 282 K and γ= 3.3 mJ mol-1K-2, respectively, and are similar to those obtained for MgPd1.25Sb. There is neither phase transition nor superconductivity observed above 1.8 K. The differences between the electronic structures of Mg-based half-Heusler compounds make them robustly metallic, irrespective of the electron count and the introduction of interstitial transition metal (Pd) atoms.

AB - The half-Heusler family consists of many semiconducting intermetallic compounds, virtually all of them having a valence electron count (VEC) of 18. We have studied an electron-deficient (VEC = 17) phase MgPdSb and its Pd-stuffed variant MgPd1.25Sb. The cubic F4¯ 3m crystal structure was confirmed by the Rietveld refinement of powder X-ray diffraction (XRD) data. The lattice parameter is a = 6.284 and 6.335 Å for MgPdSb and MgPd1.25Sb, respectively. The Debye temperature and Sommerfeld coefficient for MgPdSb are ΘD= 282 K and γ= 3.3 mJ mol-1K-2, respectively, and are similar to those obtained for MgPd1.25Sb. There is neither phase transition nor superconductivity observed above 1.8 K. The differences between the electronic structures of Mg-based half-Heusler compounds make them robustly metallic, irrespective of the electron count and the introduction of interstitial transition metal (Pd) atoms.

UR - https://www.scopus.com/pages/publications/85136651826

U2 - 10.1021/acs.jpcc.2c01367

DO - 10.1021/acs.jpcc.2c01367

M3 - Article

AN - SCOPUS:85136651826

SN - 1932-7447

VL - 126

SP - 14229

EP - 14235

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 33

ER -

MgPdSb─An Electron-Deficient Half-Heusler Phase

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