Heat Capacity Functions Research Articles

Thermal study of the tungsten bronzes I. Heat capacity of Na 0.679WO 3 in the range 15–300°K

Abstract The heat capacity of Na 0.679 WO 3 0 has been measured in the range 15–300°K. The Debye temperature per atom, which is 450° at 0°K (1) is found to pass through a minimum of 390° at 28°K, and then continuously rise to a value of 705° at 300°K. A simple four parameter isotropic model is found to be insufficient to fit the observed lattice contribution, but some qualitative inferences may be made concerning the normal mode distribution. The smoothed curve heat capacity and thermodynamic functions are tabulated from 0–300°K. The following values are found for the thermodynamic functions at 298.15°K: ( H °- H ° 0 )/ T = 52.133 J (g at. wt deg) −1 , S ° = 95.25 e.u.

Thermal study of the tungsten bronzes—I heat capacity of Na 0.679WO 3 in the range 15–300°K

The heat capacity of Na 0.679WO 30 has been measured in the range 15–300°K. The Debye temperature per atom, which is 450° at 0°K (1) is found to pass through a minimum of 390° at 28°K, and then continuously rise to a value of 705° at 300°K. A simple four parameter isotropic model is found to be insufficient to fit the observed lattice contribution, but some qualitative inferences may be made concerning the normal mode distribution. The smoothed curve heat capacity and thermodynamic functions are tabulated from 0–300°K. The following values are found for the thermodynamic functions at 298.15°K: ( H°- H° 0)/ T = 52.133 J (g at. wt deg) −1, S° = 95.25 e.u.

Triethanolamine Borate. The Heat Capacity and Thermodynamic Functions from 5 to 350°K.

Triethanolamine Borate. The Heat Capacity and Thermodynamic Functions from 5 to 350°K.

Heat capacity and thermodynamic functions of polyvinyl alcohol

Heat capacity and thermodynamic functions of polyvinyl alcohol

Heat Capacities and Thermodynamic Functions of YH2 and YD2 from 5° to 350°K and the Hydrogen Vibration Frequencies

The heat capacities of pure YH2 and YD2 were measured by an adiabatic method from 5° to 350°K. The compounds were found by x-ray analyses to consist of a single phase, with the yttrium atoms in face-centered cubic positions. Below 16°K the heat capacities of the two compounds are equal within experimental error, between 16° and 90°K the heat capacity of the hydride is about 0.02 cal deg—1 mole—1 greater than that of the deuteride, and at higher temperatures that of the deuteride becomes appreciably greater. The difference in the heat capacities above 100°K is ascribed to a single optical vibration of the hydrogen atoms, whose frequency is shifted upon isotopic substitution. The difference in the heat capacities of YH2 and YD2 in the temperature range 100° to 350°K is fitted to ±0.02 cal deg—1 mole—1 with Einstein heat capacity functions and a frequency of 1030±30 cm—1 for YH2 and 1030/√2 for YD2. These results are compared with those obtained by inelastic neutron scattering experiments. The values obtained for the heat capacity, entropy, enthalpy and Gibbs free-energy function for YH2 at 298.15°K are 8.243±0.016 cal deg—1 mole—1, 9.175±0.018 cal deg—1 mole—1, 1403±3 cal mole—1 and —4.470±0.009 cal deg—1 mole—1, respectively. The corresponding values for YD2 are 10.773±0.022, 10.294±0.021, 1659±3 and —4.729±0.010. The enthalpy of formation of YH2 minus the enthalpy of formation of YD2 is calculated to be 0.78±0.08 kcal mole—1 at 0°K and 0.55±0.08 kcal mole—1 at 298.15°K.

The Dissociation Energies of Gaseous Alkali Halides.

Calculated and experimental values of dissociation energies of gaseous alkali halides are given. The calculation methods are given for both gaseous and condensed halides, and the method used for combining the experimental data is presented. Free-energy functions, internuclear distances, fusion data, heat capacity, entropy, and enthalpy functions are also presented. The data given are for cesium, lithium, potassium, rubidium, sodium, bromine, chlorine, fluorine, and iodine. (N.W.R.)

The vibrational spectra of p-chlorobenzenethiol

The infrred absorption spectra (solution, solid and vapor phases) and the Raman spectrum (liquid phase at 70°C) of p-chlorobenzenethiol have been studied. A complete vibrational assignment has been made and used to calculate the entropy, heat capacity, heat content and free energy functions of p-chlorobenzenethiol as an ideal vapor over a range of temperature.

372. The heat capacity and thermodynamic functions of uranium from 5 to 350°K: H.E. Flotow and H.R. Lohr, J. Phys. Chem., 64, 904–906, July 1960

372. The heat capacity and thermodynamic functions of uranium from 5 to 350°K: H.E. Flotow and H.R. Lohr, J. Phys. Chem., 64, 904–906, July 1960

The Heat Capacity and Thermodynamic Functions of Mercurous Sulfate Between 4 and 20°K.1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of Mercurous Sulfate Between 4 and 20°K.1T. E. Brackett, E. W. Hornung, and T. E. HopkinsCite this: J. Am. Chem. Soc. 1960, 82, 16, 4155–4157Publication Date (Print):August 1, 1960Publication History Published online1 May 2002Published inissue 1 August 1960https://doi.org/10.1021/ja01501a008RIGHTS & PERMISSIONSArticle Views24Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (386 KB) Get e-Alerts Get e-Alerts

The Heat Capacity and Thermodynamic Functions of β-Uranium Deuteride from 5 to 350°K.1,2

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of β-Uranium Deuteride from 5 to 350°K.1,2Bernard M. Abraham, Darrell W. Osborne, Howard E. Flotow, and Robert B. MarcusCite this: J. Am. Chem. Soc. 1960, 82, 5, 1064–1068Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March 1960https://doi.org/10.1021/ja01490a012RIGHTS & PERMISSIONSArticle Views65Altmetric-Citations22LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (588 KB) Get e-Alerts Get e-Alerts

The Heat Capacity and Thermodynamic Functions of β-Uranium Hydride from 5 to 350°K.1,2

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of β-Uranium Hydride from 5 to 350°K.1,2Howard E. Flotow, Harold R. Lohr, Bernard M. Abraham, and Darrell W. OsborneCite this: J. Am. Chem. Soc. 1959, 81, 14, 3529–3533Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https://doi.org/10.1021/ja01523a011RIGHTS & PERMISSIONSArticle Views186Altmetric-Citations39LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (607 KB) Get e-Alerts Get e-Alerts

α-Ferric Oxide: Low Temperature Heat Capacity and Thermodynamic Functions

ABS>The heat capacity of synthetic alpha ferric oxide was determined at 5 to 350 K. The experimental technique is described, and the heat capacity and molal thermodyamic functions are tabulated. The heat capacity vs. temperature is shown graphically. (J.R.D.)

Low Temperature Heat Capacity and Thermodynamic Functions of Triuranium Octoxide1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow Temperature Heat Capacity and Thermodynamic Functions of Triuranium Octoxide1Edgar F. Westrum Jr. and Fredrik GrønvoldCite this: J. Am. Chem. Soc. 1959, 81, 8, 1777–1780Publication Date (Print):April 1, 1959Publication History Published online1 May 2002Published inissue 1 April 1959https://doi.org/10.1021/ja01517a001RIGHTS & PERMISSIONSArticle Views84Altmetric-Citations29LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (427 KB) Get e-Alerts Get e-Alerts

Thermodynamics of Nonstoichiometric Nickel Tellurides. I. Heat Capacity and Thermodynamic Functions of the δ Phase from 5 to 350°K

Heat capacities of the nickel tellurides were measured at compositions NiTe1.1 and NiTe2.0 (near limits of homogeneity of the δ phase) and at one intermediate composition, NiTe1.5, from 5 to 350°K. Heat capacity values and entropy and enthalpy increments are tabulated. No evidence of order-disorder transitions, or thermal anomalies, or of contributions to the thermal properties from the anisotropy or phonon scattering by the holes in the structure on approaching the composition NiTe2 was observed. Although simple additivity of the heat capacities of the constituent elements failed to represent that of the solution compositions adequately, a Kopp-Neumann treatment in terms of the limiting compositions of the δ phase gives good agreement with the experimental heat capacity and entropy of NiTe1.5 and hence is useful in interpolating to other intermediate compositions.

Applications of an Enthalpy-Fuel/Air Ratio Diagram to “First Law” Combustion Problems

Abstract An “absolute enthalpy” is defined which has the advantage that the enthalpies of different systems are similar and compatible quantities regardless of differences in state or chemical composition. An enthalpy-fuel/air ratio diagram for equilibrium state combustion gases is formulated using absolute enthalpies. On this diagram, virtually all processes which involve combustion and combustion product gases—and which are entirely within the scope of the first law of thermodynamics—can be represented by straight lines. Such a diagram therefore provides a very rapid and flexible method of solving many frequently occurring combustion problems. Procedures for handling the following typical problems are developed: Determination of adiabatic flame temperatures, theoretical heat releases, combustion efficiencies (from experimental temperature measurements), and the adiabatic mixing of two streams. Absolute enthalpy and heat-capacity data for (CH2)y-air (in 100 R increments) and (CH3)y-air (in 50 K increments) systems are tabulated for lean and rich composition ranges. Above ~ 3000 R ~ 1400 K the enthalpy and heat-capacity functions are pressure sensitive and the tabulated data are for 1 atm.

The Heat Capacity and Thermodynamic Functions of Tetrauranium Nonoxide from 5 to 310°K.1

The Heat Capacity and Thermodynamic Functions of Tetrauranium Nonoxide from 5 to 310°K.¹

The Heat Capacity and Thermodynamic Functions of Sodium Metaborate from 5 to 350°K.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of Sodium Metaborate from 5 to 350°K.George Grenier and Edgar F. Westrum Jr.Cite this: J. Am. Chem. Soc. 1956, 78, 24, 6226–6227Publication Date (Print):December 1, 1956Publication History Published online1 May 2002Published inissue 1 December 1956https://doi.org/10.1021/ja01605a004RIGHTS & PERMISSIONSArticle Views89Altmetric-Citations9LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (237 KB) Get e-Alerts Get e-Alerts

Heat Capacity and Thermodynamic Functions of Uranium(IV) Oxychloride and Uranium (IV) Oxybromide from 10 to 350°K.1

Heat Capacity and Thermodynamic Functions of Uranium(IV) Oxychloride and Uranium (IV) Oxybromide from 10 to 350°K.¹

Heat Capacity and Thermodynamic Functions of Uranyl Chloride from 6 to 350°K.1

Heat Capacity and Thermodynamic Functions of Uranyl Chloride from 6 to 350°K.¹

Low Temperature Heat Capacities of Inorganic Solids. VII. Heat Capacity and Thermodynamic Functions of Li2O. Thermodynamics of the Li2O-H2O System1

Low Temperature Heat Capacities of Inorganic Solids. VII. Heat Capacity and Thermodynamic Functions of Li₂O. Thermodynamics of the Li₂O-H₂O System¹