Publications Repository - Gdańsk University of Technology

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 F4̅3m 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–1 K–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.

Authors

• dr inż. Michał Winiarski link open in new tab ,
• Kamila Stolecka link open in new tab ,
• dr inż. Leszek Litzbarski link open in new tab ,
• Thao Tran,
• dr inż. Karolina Górnicka link open in new tab ,
• prof. dr hab. inż. Tomasz Klimczuk link open in new tab