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The Journal of Chemical Thermodynamics, 2021
Abstract The standard molar enthalpy of transition between the two known polymorphs of 4′-hydroxyacetophenone (HAP), at 298.15 K, was determined from measurements of their standard molar enthalpies of solution in dimethyl sulfoxide (DMSO). The obtained result Δ trs H m o ( cr II → cr I) = (0.48 ± 0.10) kJ.mol−1 is in ...
Inês O. Feliciano +2 more
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Abstract The standard molar enthalpy of transition between the two known polymorphs of 4′-hydroxyacetophenone (HAP), at 298.15 K, was determined from measurements of their standard molar enthalpies of solution in dimethyl sulfoxide (DMSO). The obtained result Δ trs H m o ( cr II → cr I) = (0.48 ± 0.10) kJ.mol−1 is in ...
Inês O. Feliciano +2 more
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Physics and Chemistry of Minerals, 1990
ZnSiO3 clinopyroxene stable above 3 GPa transforms to ilmenite at 10–12 GPa, which further decomposes into ZnO (rock salt) plus stishovite at 20–30 GPa. The enthalpy of the clinopyroxene-ilmenite transition was measured by high-temperature solution calorimetry, giving ΔH0=51.71 ±3.18 kJ/mol at 298 K.
M. Akaogi +5 more
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ZnSiO3 clinopyroxene stable above 3 GPa transforms to ilmenite at 10–12 GPa, which further decomposes into ZnO (rock salt) plus stishovite at 20–30 GPa. The enthalpy of the clinopyroxene-ilmenite transition was measured by high-temperature solution calorimetry, giving ΔH0=51.71 ±3.18 kJ/mol at 298 K.
M. Akaogi +5 more
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The Journal of Chemical Thermodynamics, 2017
© 2017 Elsevier Ltd In the present work two methods of determination of sublimation enthalpies at 298.15 K based on solution enthalpies at 298.15 K and fusion enthalpies at the melting temperatures were applied for aromatic amines. The sublimation enthalpies of 17 substituted anilines and 1- and 2-naphthylamines at 298.15 K were calculated using their ...
Yagofarov M. +2 more
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© 2017 Elsevier Ltd In the present work two methods of determination of sublimation enthalpies at 298.15 K based on solution enthalpies at 298.15 K and fusion enthalpies at the melting temperatures were applied for aromatic amines. The sublimation enthalpies of 17 substituted anilines and 1- and 2-naphthylamines at 298.15 K were calculated using their ...
Yagofarov M. +2 more
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Direct measurements of fusion and phase transition enthalpies in lanthanum oxide
Journal of Materials Research, 2011Abstract
Sergey V. Ushakov, Alexandra Navrotsky
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Enthalpies of formation of transition-metal lanthanide laves phases with the MgCu2 structure
Journal of Phase Equilibria, 1997Experimental information and theoretical estimates for the enthalpy of formation at 298 K for the RM2 (whereM = Fe, Co,orNi andR = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Lu) lanthanide Laves phases with the MgCu2 (C15) structure are reviewed and discussed in the light of information on lattice parameters and atomic volume.
S. Norgren, J. ågren
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Heat capacity at low temperatures, phase transitions, entropy and enthalpy of rubidium hyperperoxide
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 19701. The authors have synthesized RbO2 (99.8%) by roasting Rb in a current of an argon-oxygen mixture. 2. The heat capacities of RbO2 have been determined in a vacuum adiabatic calorimeter in the range 12.9–297.8°K, and anomalies observed at 15 and 178.3°K.
I. E. Paukov +3 more
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Journal of Solid State Chemistry, 1997
The enthalpies of formation, heat content, heat capacity, and transition of NaMgF3perovskite have been determined. A new high temperature calorimetric methodology has been applied for the enthalpy of formation measurements. The heat content and heat of formation measurements were done using a “hybrid calorimeter” built recently in our laboratory.
L. Topor +3 more
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The enthalpies of formation, heat content, heat capacity, and transition of NaMgF3perovskite have been determined. A new high temperature calorimetric methodology has been applied for the enthalpy of formation measurements. The heat content and heat of formation measurements were done using a “hybrid calorimeter” built recently in our laboratory.
L. Topor +3 more
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Journal of Chemical & Engineering Data, 2006
This work has been undertaken in order to obtain additional data on vapor pressures of chlorobenzene derivatives and to develop the group-additivity values necessary for predicting their vaporization enthalpies at the reference temperature T = 298.15 K.
Sergey P. Verevkin +2 more
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This work has been undertaken in order to obtain additional data on vapor pressures of chlorobenzene derivatives and to develop the group-additivity values necessary for predicting their vaporization enthalpies at the reference temperature T = 298.15 K.
Sergey P. Verevkin +2 more
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Enthalpy and numerical simulation of phase transitions in a Zr–C system
High Temperature, 2015An approximate method for calculating the enthalpy of a Zr–C system in a wide range of state parameters (including the liquid phase) is proposed. The dynamics of phase transitions upon laser heating of Zr–C samples is simulated numerically based on the results of calculating enthalpy. Typical calculated thermograms of heating and cooling are presented;
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Enthalpies of two phase transitions in the high-temperature form of n-butyl octadecanoate
The Journal of Chemical Thermodynamics, 1986Abstract The molar enthalpy of melting of n -butyl octadecanoate at 299.72 K is 37.48 kJ · mol −1 and the molar enthalpy of transition from solid α 2 to solid α 1 at 288.4 K is 2.22 kJ · mol −1 .
Barbara Kalinowska, Andrzej W. Jackowski
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