Ueber die Additivität der Atomwärmen

Meyer, Stefan

doi:10.1002/andp.19003070511

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The measured and calculated values for C p shown in Figure b include that from application of the simple Neumann–Kopp additivity rule (NKR) (67.85 J mol –1 K –1 ) and from the Dulong–Petit limit (66.86 J mol –1 K –1 ) for comparison. The C p of the FLiNaK mixture appears to be best represented by the relation of eq 16 derived in this thermodynamic modeling work (Figure b) with RSD = 4.4%. C p .25em ( J / normalm normalo normall K ) F L i N a K ( l ) = 69.822 + 0.000679 T + 2 , 137 , 152 T − 2 …”

Section: Resultsmentioning

confidence: 99%

“…The measured and calculated values for C p shown in Figure 6b include that from application of the simple Neumann−Kopp additivity rule 88 (NKR) (67.85 J mol −1 K −1 ) and from the Dulong−Petit limit 89 Given the small temperature dependence of C p , its error can be reasonably approximated by a constant value of 3.21 J mol −1 K −1 over the general temperature range of interest.…”

Section: Heat Capacitymentioning

confidence: 95%

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Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Schorne-Pinto,

Aziziha,

Tisdale

et al. 2024

ACS Appl. Energy Mater.

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The thermodynamic properties of the LiF−NaF−KF system and its subsystems were re-evaluated using the CALPHAD method, focusing on the deviations from ideality in the heat capacity [C p (T)] of mixtures, temperature-dependence of mixing enthalpies (Δ mix H), vapor pressures of mixtures, and enthalpies of fusion (ΔH fus ) using reported values and measurements. The results of this work confirmed a pseudoternary eutectic at 732.9 K and 46.5LiF− 11.5NaF−42KF mol % (FLiNaK) with determined C p (T) = 69.822 + 0.000679T + 2,137,152T −2 J mol −1 K −1 (732.9 < T < 1200 K) and ΔH fus = 18,051 J mol −1 in good agreement to the experimental values. The resulting accurate thermodynamic representation can be used to find relevant excess thermochemical properties in the whole pseudoternary space and provide insights into their composition and temperature dependence. A detailed evaluation of select thermophysical properties was also conducted to determine recommended density, thermal diffusivity, thermal conductivity, vapor pressures, and boiling point with calculated uncertainties over the temperature range of interest for FLiNaK−salt energy applications.

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Section: Resultsmentioning

confidence: 99%

Section: Heat Capacitymentioning

confidence: 95%

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Schorne-Pinto,

Aziziha,

Tisdale

et al. 2024

ACS Appl. Energy Mater.

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“…The NKR was found to be applicable in several compounds [ 88 ] whose molar volumes are nearly equal to the weighted-sum of the elemental molar volumes. The ab initio computed molar volume of Al

Sc is

mol

, in agreement with the experimental value [ 16 ] of

mol

.…”

Section: Results and Discussionmentioning

confidence: 99%

A Combined Experimental and First-Principles Based Assessment of Finite-Temperature Thermodynamic Properties of Intermetallic Al3Sc

et al. 2021

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We present a first-principles assessment of the finite-temperature thermodynamic properties of the intermetallic Al3Sc phase including the complete spectrum of excitations and compare the theoretical findings with our dilatometric and calorimetric measurements. While significant electronic contributions to the heat capacity and thermal expansion are observed near the melting temperature, anharmonic contributions, and electron–phonon coupling effects are found to be relatively small. On the one hand, these accurate methods are used to demonstrate shortcomings of empirical predictions of phase stabilities such as the Neumann–Kopp rule. On the other hand, their combination with elasticity theory was found to provide an upper limit for the size of Al3Sc nanoprecipitates needed to maintain coherency with the host matrix. The chemo-mechanical coupling being responsible for the coherency loss of strengthening precipitates is revealed by a combination of state-of-the-art simulations and dedicated experiments. These findings can be exploited to fine-tune the microstructure of Al-Sc-based alloys to approach optimum mechanical properties.

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Ueber die Molecularwärmen zusammengesetzter Körper und das Gesetz Neumann‐Joule‐Kopp

Aubel¹

1901

Annalen der Physik

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Ueber die Additivität der Atomwärmen

Abstract: Ueber d i e Additiuitat der AtomwiXrmen; uon S t a f a n M e y e r. Hr. F. R i c h a r z ') hat vor einiger Zeit anf Grund kinetischer Betrachtungen und in Verfolgung eines von Hrn.

Cited by 5 publications

References 4 publications

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

A Combined Experimental and First-Principles Based Assessment of Finite-Temperature Thermodynamic Properties of Intermetallic Al3Sc

Ueber die Molecularwärmen zusammengesetzter Körper und das Gesetz Neumann‐Joule‐Kopp

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