18 valance electron count rule 2 Aliovalent substitution 2 Atoms 2 Boltzmann equation 2 Calculations 2 Density functional theory 2 Density-functional-theory 2 Dynamics 2 Electron count 2 Electronic structure 2 Electrons 2 Energy gap 2 First principles 2 Hafnium alloys 2 Half heusler alloy Half-Heusler alloys 2 L-values 2 Lattice vibrations 2 Pentanary 2 Perturbation techniques 2 Phonon scattering 2 Phonons 2 Ternary alloys 2 Thermal conductivity 2 Thermoelectric transport properties 2 Titanium alloys 2 Valence electron 2