The rare earth ruthenium pyrochlore Ho2Ru2O7(s): thermodynamic properties by electrochemical cell and differential scanning calorimetric measurements

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98910-98914 ◽  
Author(s):  
Aparna Banerjee ◽  
A. R. Joshi
Keyword(s):  
Rare Earth ◽  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Electrochemical Cell ◽  
Differential Scanning Calorimetric ◽  
Gibbs Energy Of Formation ◽  
Calorimetric Measurements ◽  
Ion Conducting ◽  
Oxide Ion ◽  
Energy Of Formation

The Gibbs energy of formation of Ho2Ru2O7(s) has been determined using a galvanic cell and by employing an oxide ion conducting electrolyte.

Thermodynamic stability and impedance measurements of perovskite LuRhO3(s) in the Lu–Rh–O system

RSC Advances ◽  
2014 ◽  
Vol 4 (38) ◽  
pp. 19953-19959 ◽  
Author(s):  
Aparna Banerjee ◽  
Pooja Sawant ◽  
R. Mishra ◽  
S. R. Bharadwaj ◽  
A. R. Joshi
Keyword(s):  
Solid State ◽  
Gibbs Energy ◽  
Thermodynamic Stability ◽  
Electrochemical Technique ◽  
Gibbs Energy Of Formation ◽  
Impedance Measurements ◽  
System P ◽  
Ion Conducting ◽  
Oxide Ion ◽  
Energy Of Formation

The Gibbs energy of formation of LuRhO3(s) has been determined using a solid-state electrochemical technique employing an oxide ion conducting electrolyte.

scholarly journals Digitizing “The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units”

2020 ◽  
Vol 125 ◽  
Author(s):  
Janiel J. Reed
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Enthalpy Of Formation ◽  
Constant Pressure ◽  
Organic Substances ◽  
Gibbs Energy Of Formation ◽  
Chemical Thermodynamic ◽  
Enthalpy Difference ◽  
Energy Of Formation

The NBS Tables of Chemical Thermodynamic Properties is a collection of thermodynamic properties, published in book form, consisting of 103 tables with 14 330 critically evaluated species. The tables were originally published as a series of NBS Technical Notes As a result of this work, the data is now available in a more accessible spreadsheet format. Enthalpy of formation, ΔfH°, Gibbs energy of formation, ΔfG°, entropy, S°, heat capacity at constant pressure, Cp°, all at 298.15 K, and the enthalpy difference, [H°(298) – H°(0)] are provided where known. Within this collection of data, there are no values given for transuranic elements, Np to Lr (Tables 77–87).

Thermodynamic properties of molybdate ion: reaction cycles and experiments

2015 ◽  
Vol 87 (5) ◽  
pp. 461-476 ◽  
Author(s):  
Heinz Gamsjäger ◽  
Masao Morishita
Keyword(s):  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Metal Ions ◽  
Enthalpy Of Formation ◽  
Alkaline Earth ◽  
Standard Entropy ◽  
Gibbs Energy Of Formation ◽  
Silver Molybdate ◽  
Gibbs Energies ◽  
Energy Of Formation

AbstractStandard molar quantities of molybdate ion entropy, $S_{\rm{m}}^0,$ enthalpy of formation, ${\Delta _{\rm{f}}}H_m^{\rm{o}},$ and Gibbs energy of formation, ${\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}},$ are key data for the thermodynamic properties of molybdenum compounds and complexes, which are at present investigated by an OECD NEA review project. The most reliable method to determine ${\Delta _{\rm{f}}}H_{\rm{m}}^{\rm{o}}$ of molybdate ion and alkali molybdates directly consists in measuring calorimetrically the enthalpy of dissolution of crystallized molybdenum trioxide and anhydrous alkali molybdates in corresponding aqueous alkali metal hydroxide solutions. Solubility equilibria of sparingly soluble alkaline earth molybdates and silver molybdate lead to trustworthy data for ${\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}}$ of molybdate ion. Thereby the Gibbs energies of the metal molybdates and the corresponding metal ions are combined with the Gibbs energies of dissolution. As reliable values are available for ${\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}}$ of the relevant metal ions the problem reduces to select the best values of solubility constants and ${\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}}$ of alkaline earth molybdates and silver molybdate. There are two independent possibilities to achieve the latter task. (1) ${\Delta _{\rm{f}}}H_{\rm{m}}^{\rm{o}}$ for alkaline earth molybdates and silver molybdate have been determined by solution calorimetry. Entropy data of molybdenum have been compiled and evaluated recently. CODATA key values are available for $S_{\rm{m}}^{\rm{o}}$ of the other elements involved. Whereas $S_{\rm{m}}^{\rm{o}}({\rm{CaMo}}{{\rm{O}}_4},{\rm{ cr}})$ is well known since decades, low-temperature heat capacity measurements had to be performed recently, but now reliable values for $S_{\rm{m}}^{\rm{o}}$ of Ag2MoO4(cr), BaMoO4(cr) and SrMoO4(cr) are available. (2) ${\Delta _{\rm{f}}}H_{\rm{m}}^{\rm{o}}({\rm{BaMo}}{{\rm{O}}_4},{\rm{ cr}}),$ for example, can be obtained from high temperature equilibria also, but the result is less accurate than that of the first method. Once Gibbs energy of formation, ${\Delta _{\rm{f}}}G_{\rm{m}}^{\rm{o}},$ and enthalpy of formation, ${\Delta _{\rm{f}}}H_{\rm{m}}^{\rm{o}},$ of molybdate ion are known its standard entropy, $S_{\rm{m}}^{\rm{o}},$ can be calculated.

The Dependence of Gibbs Energy of Formation of Niobium Mononitride on its Composition and Temperature in the Range of 1773-2023 K

2018 ◽  
Vol 284 ◽  
pp. 139-145
Author(s):  
V.M. Zhikharev ◽  
M.S. Pavlovskaya
Keyword(s):  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Interaction Parameter ◽  
Parameter Method ◽  
Gibbs Energy Of Formation ◽  
Niobium Nitrides ◽  
Energy Of Formation

The article demonstrates the applicability of the interaction parameter method for describing the thermodynamic properties of non-stoichiometric niobium nitrides at temperatures of 1773 ± 2023 K. The authors obtained the equation of dependence of the nitride dissociation elasticity on its composition and temperature. They derived the expression for calculating Gibbs energy of formation of nitrides with a set composition, including stoichiometric, in the range of 1773 - 2023 K.

Thermodynamic properties of montechellite

2019 ◽  
Vol 64 (12) ◽  
pp. 1274-1280
Author(s):  
L. P. Ogorodova ◽  
Yu. D. Gritsenko ◽  
M. F. Vigasina ◽  
A. Yu. Bychkov ◽  
D. A. Ksenofontov ◽  
...  
Keyword(s):  
High Temperature ◽  
Gibbs Energy ◽  
Solution Calorimetry ◽  
Thermochemical Study ◽  
Gibbs Energy Of Formation ◽  
Calvet Microcalorimeter ◽  
Magnesium Orthosilicate ◽  
Calcium And Magnesium ◽  
The Enthalpy Of Formation ◽  
Energy Of Formation

A thermochemical study of natural calcium and magnesium orthosilicate ─ monticellite (Ca1.00Mg0.95)[SiO4] (Khabarovsk Territory, Russia) was carried out on the Tian-Calvet microcalorimeter. The enthalpy of formation from the elements fHоel(298.15 K) = -2238.4 4.5 kJ / mol was determined by the method of high-temperature melt solution calorimetry. The enthalpy and Gibbs energy of formation of monticellite of the theoretical composition of CaMg[SiO4] are calculated: fH0el(298.15 K) = -2248.4 4.5 kJ/mol and fG0el(298.15 K) = -2130.5 4.5 kJ/mol.

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