Standard molar enthalpies of formation of Me5Ge3 (M ≡ Zr, Nb, Mo), MeGe (Me ≡ Ru, Rh, Pd) and Pd2Ge by high-temperature calorimetry

Abstract The standard enthalpies of formation of 4d transition-metal germanides were determined using a high-temperature calorimeter at 1473 ± 2 K: ΔH o f ( Zr 5 Ge 3 ) = − 648.6 ± 45.1 kJ mol − 1 , ΔH o f ( Nb 5 Ge 3 ) = − 553.8 ± 33.8 kJ mol − 1 by solute-solvent drop calorimetry, and ΔH o f ( Mo 5 Ge 3 ) = − 133.6 ± 4.0 kJ mol − 1 , ΔH o f ( RuGe ) = − 56.9 ± 1.4 kJ mol − 1 , ΔH o f ( RhGe ) = − 113.8 ± 2.1 kJ mol − 1 , ΔH o f ( PdGe ) = − 92.9 ± 1.5 kJ mol − 1 , by the direct synthesis method. A value for Pd 2 Ge is also reported: ΔH o f ( Pd 2 Ge ) = − 156.8 ± 2.7 kJ mol − 1 . The results obtained are compared with available data and