Standard molar enthalpies of formation of Me5Ge3 (M ≡ Zr, Nb, Mo), MeGe (Me ≡ Ru, Rh, Pd) and Pd2Ge by high-temperature calorimetry
摘要:
The standard enthalpies of formation of 4d transition-metal germanides were determined using a high-temperature calorimeter at 1473 +/- 2 K: DELTA-H(f)o(Zr5Ge3) = - 648.6 +/- 45.1 kJ mol-1, DELTA-H(f)o(Nb5Ge3) = - 553.8 +/- 33.8 kJ mol-1 by solute-solvent drop calorimetry, and DELTA-H(f)o(Mo5Ge3) = - 133.6 +/- 4.0 kJ mol-1, DELTA-H(f)o(RuGe) = - 56.9 +/- 1.4 kJ mol-1, DELTA-H(f)o(RhGe) = - 113.8 +/- 2.1 kJ mol-1, DELTA-H(f)o(PdGe) = - 92.9 +/- 1.5 kJ mol-1, by the direct synthesis method. A value for Pd2Ge is also reported: DELTA-H(f)o(Pd2Ge) = - 156.8 +/- 2.7 kJ mol-1.
Standard molar enthalpies of formation of Me5Ge3 (M ≡ Zr, Nb, Mo), MeGe (Me ≡ Ru, Rh, Pd) and Pd2Ge by high-temperature calorimetry
摘要:
The standard enthalpies of formation of 4d transition-metal germanides were determined using a high-temperature calorimeter at 1473 +/- 2 K: DELTA-H(f)o(Zr5Ge3) = - 648.6 +/- 45.1 kJ mol-1, DELTA-H(f)o(Nb5Ge3) = - 553.8 +/- 33.8 kJ mol-1 by solute-solvent drop calorimetry, and DELTA-H(f)o(Mo5Ge3) = - 133.6 +/- 4.0 kJ mol-1, DELTA-H(f)o(RuGe) = - 56.9 +/- 1.4 kJ mol-1, DELTA-H(f)o(RhGe) = - 113.8 +/- 2.1 kJ mol-1, DELTA-H(f)o(PdGe) = - 92.9 +/- 1.5 kJ mol-1, by the direct synthesis method. A value for Pd2Ge is also reported: DELTA-H(f)o(Pd2Ge) = - 156.8 +/- 2.7 kJ mol-1.