Masao Morishita

Calorimetric study of MgZn2 and Mg2Zn11

Abstract The thermodynamic properties of MgZn2 and Mg2Zn11 were investigated by calorimetry. The standard entropies of formation at 298 K, ΔfSo298, were determined from measuring the heat capacities, Cp, from near absolute zero (2 K) to 390 K by the relaxation method. The standard enthalpies of formation at 298 K, ΔfHo298, were determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energies of formation at 298 K, ΔfGo298, were determined from these data. The electronic contribution to the heat capacities of MgZn2 and M2Zn11 were found to be similar to pure Zn, indicating that the valence electrons of Mg are trapped by the density of states for Zn in the vicinity of the Fermi level.

Calorimetric Study of Mg2Zn3

The thermodynamic properties of Mg 2 Zn 3 were investigated by calorimetry. The standard entropy of formation at 298 K, Δ f S o 2 9 8 , was determined from measuring the heat capacity, C p , from near-absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, Δ f H o 2 9 8 , was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation at 298 K, Δ f G o 2 9 8 , was determined from these data. The results obtained were as follows: Δ f H o 2 9 8 (Mg 2 Zn 3 ) = -69.80 ′ 20 kJ . mol - 1 ; Δ f S o 2 9 8 (Mg 2 Zn 3 ) = -10.95 ′ 1.80 J . K - 1 . mol - 1 ; Δ f G o 2 9 8 (Mg 2 Zn 3 ) = -66.55 ′ 20 kJ mol - 1 . The electronic contribution to the heat capacity of Mg 2 Zn 3 was found to be similar to pure magnesium, indicating that the density of states in the vicinity of the Fermi level follows the free-electron parabolic law.

Calculated phase diagram of the Ni–Mo–B ternary system

Abstract The phase diagram of the Ni–Mo–B ternary system in the region of less than 50 mol%B was constructed by thermodynamic calculation. We found three ternary eutectic points and three ternary peritecto-eutectic points as follows: E 1 : L(1365 K, 71.5 mol%Ni–6.0 mol%Mo–22.5 mol%B)=(Ni)+Ni 3 B+NiMo 2 B 2 . E 2 : L(1355 K, 62.5 mol%Ni–2.5 mol%Mo–30.5 mol%B)=Ni 3 B+Ni 2 B+NiMo 2 B 2 . E 3 : L(1445 K, 42.0 mol%Ni–30.6 mol%Mo–10.3 mol%B)=(Ni)+NiMo+NiMo 2 B 2 . P 1 : L(1812 K, 34.9 mol%Ni–42.3 mol%Mo–22.8 mol%B)+MoB=Mo 2 B+NiMo 2 B 2 . P 2 : L(1633 K, 42.3 mol%Ni–40.4 mol%Mo–17.3 mol%B)+Mo=Mo 2 B+NiMo 2 B 2 . P 3 : L(1478 K, 53.5 mol%Ni–33.7 mol%Mo–12.8 mol%B)+Mo=NiMo+NiMo 2 B 2 . The calculated phase diagram is expected to be useful for the development of new Ni-based heat-, corrosion- or wear-resistance alloys.

Calorimetric study of Zn13La

Abstract The thermodynamic properties of Zn13La were investigated by calorimetry. The standard entropy of formation at 298 K, ΔfS°298, was determined from measuring the heat capacities, Cp, from near absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, ΔfH°298, was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation at 298 K, ΔfG°298, was determined from these data. The coefficient, γ, of the electronic term contributing to the heat capacity of Zn13La was similar to the composition average of the values of pure Zn and La, indicating that the 5d- and 4f-electron states for La are localized in the vicinity of the Fermi energy level.

Thermodynamic properties of molybdate ion: reaction cycles and experiments

Abstract Standard molar quantities of molybdate ion entropy, Sm0,

Standard Gibbs energy of formation of Zn17Y2 and Zn12Y determined by solution calorimetry and measurement of heat capacity from near zero Kelvin

S_{\rm{m}}^0,

Re-evaluation of activities of magnesium and zinc components in the magnesium—zinc binary system from very low to high temperature

enthalpy of formation, ΔfHmo,

Electrodeposition of Zn-Sb Thermoelectric Semiconductor Film in Ethylene Glycol Non-Aqueous Solution Containing Zn(II) and Sb(III)

{\Delta _{\rm{f}}}H_m^{\rm{o}},

Chapter 1 – Thermal Spectroscopy of Magnesium–Zinc Binary Compounds Near Absolute Zero Kelvin: Coefficient of the Electronic Contribution to Heat Capacity and Density of States in the Vicinity of the Fermi Level

and Gibbs energy of formation, ΔfGmo,

Local structure analysis of (Na0.5K0.45Li0.05)NbO3 synthesized by malic acid complex solution method

{\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}},