scholarly journals Enthalpy of formation of U3Si2: A high-temperature drop calorimetry study

2018 ◽  
Vol 507 ◽  
pp. 44-49 ◽  
Author(s):  
Xiaofeng Guo ◽  
Joshua T. White ◽  
Andrew T. Nelson ◽  
Artaches Migdisov ◽  
Robert Roback ◽  
...  
Keyword(s):  
High Temperature ◽  
Enthalpy Of Formation ◽  
Temperature Drop ◽  
Drop Calorimetry

Energetics of Manganese Oxides

1995 ◽  
Vol 398 ◽  
Author(s):  
S. Fritsch ◽  
A. Navrotsky
Keyword(s):  
Phase Diagram ◽  
High Temperature ◽  
Enthalpy Of Formation ◽  
Manganese Oxides ◽  
Temperature Drop ◽  
Solution Calorimetry ◽  
Drop Calorimetry ◽  
Thermodynamic Cycles

ABSTRACTThe energetics of some manganese oxides : pyrolusite ΜnO2, bixbyite Μn2O3, hausmannite Μn3O4 and manganosite MnO were studied by transposed temperature drop calorimetry and high temperature drop solution calorimetry in molten 2PbOB2O3 at 977 K. The enthalpies of oxidation at 298 K in the Mn-O system, determined by appropriate thermodynamic cycles, are (in kJ/mol O2) : −441.4 ± 5.8 for the reaction 6 MnO + O2 -> 2 Mn3O4, −201.8 ± 8.7 for 4 Mn3O4 + O2 -> 6 Mn2O3 and −162.1 ± 7.2 for 2 Mn2O3 + O2 -> 4 ΜnO2 These values agree very well with previous data obtained by equilibrium ρθ2 measurements and indicate that direct calorimetrie measurements are well suited to obtain reliable enthalpy of formation data for oxides containing manganese in the 2+, 3+ and 4+ states. The phase diagram of the Mn-O system was calculated using these new values of enthalpies.

Experimental results of the Li-Pb-Pt system obtained by the high temperature drop calorimetry

2021 ◽  
pp. 115824
Author(s):  
S. Terlicka ◽  
A. Dębski ◽  
W. Gąsior ◽  
A. Fornalczyk ◽  
M. Saternus
Keyword(s):  
High Temperature ◽  
Temperature Drop ◽  
Experimental Results ◽  
Drop Calorimetry

High temperature drop calorimetry measurements of enthalpy increment in Ti–xTa (x=5, 10, 15, 20 mass%) alloys

2014 ◽  
Vol 75 (2) ◽  
pp. 283-295 ◽  
Author(s):  
Madhusmita Behera ◽  
Subramanian Raju ◽  
Ganapathy Panneerselvam ◽  
Mythili Rangachari ◽  
Saroja Saibaba
Keyword(s):  
High Temperature ◽  
Temperature Drop ◽  
Enthalpy Increment ◽  
Drop Calorimetry

Heat capacity of the AuZr compound obtained by high-temperature drop calorimetry

2011 ◽  
Vol 19 (3) ◽  
pp. 282-287
Author(s):  
M. Lomello-Tafin ◽  
M.Y. Benarchid ◽  
C. Antion ◽  
A. Janghorban ◽  
J.M. Moreau
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Temperature Drop ◽  
Drop Calorimetry

Thermochemistry of uranium compounds. XVI. Calorimetric determination of the standard molar enthalpy of formation at 298.15 K, low-temperature heat capacity, and high-temperature enthalpy increments of UO2(OH2)•H2O (schoepite)

1988 ◽  
Vol 66 (4) ◽  
pp. 620-625 ◽  
Author(s):  
I.R. Tasker ◽  
P. A. G. O'Hare ◽  
Brett M. lewis ◽  
G. K. Johnson ◽  
E. H. P. Cordfunke
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Low Temperature ◽  
Thermodynamic Properties ◽  
Enthalpy Of Formation ◽  
Molar Heat Capacity ◽  
Temperature Drop ◽  
Molar Enthalpy ◽  
Standard Molar Enthalpy ◽  
Enthalpy Increments

Three precise calorimetric methods, viz., low-temperature adiabatic, high-temperature drop, and solution-reaction, have been used to determine as a function of temperature the key chemical thermodynamic properties of a pure sample of schoepite, UO2(OH)2•H2O. The following results have been obtained at the standard reference temperature T = 298.15 K: standard molar enthalpy of formation [Formula: see text] molar heat capacity [Formula: see text] and the standard molar entropy [Formula: see text] The molar enthalpy increments relative to 298.15 K and the molar heat capacity are given by the polynomials: [Formula: see text] and [Formula: see text], where 298.15 K < T < 400 K. The present result for [Formula: see text] at 298.15 K has been combined with three other closely-agreeing values from the literature to give a recommended weighted mean [Formula: see text] from which is calculated the standard Gibbs energy of formation [Formula: see text] at 298.15 K. Complete thermodynamic properties of schoepite are tabulated from 298.15 to 423.15 K.

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