Wärmeinhalt einiger Metalle, Legierungen und Schlackenbildner bei Temperaturen bis 1200°

Esser, Hans; Averdieck, Kobert; Grass, Walter

doi:10.1002/srin.193300418

Cited by 34 publications

(9 citation statements)

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“…Using new data of Aronson et al (2007) we described the low temperature heat capacity and entropy, obtaining results in accordance with their experimental data and those of Robie et al (1982) and Kelley (1943). Both analyses mimic heat capacity data of Watanabe (1982) between 350 and 700 K. For temperatures above 700 K only two significantly different data sets are available, those of Esser et al (1933) and those of Orr (1953). The set of Orr (1953) is generally considered to be the more accurate.…”

Section: Discussionsupporting

confidence: 63%

“…The V-P-T data of Yagi et al (1987), which are at the highest temperatures relative to all other measurements given in Table 2, are represented to within experimental uncertainty of about 0.3%. Figure 6 and Table 2 demonstrate that the heat capacity calculated from our analyses differs insignificantly from the experimental data for temperatures up to about 700 K. For temperatures above 700 K the only experimental data are reported by Esser et al (1933) on a natural fayalite sample and by Orr (1953) on a synthetic sample. The data of Orr (1953) are generally considered to be more accurate and are used in data compilations such as those by Barin (1989).…”

Section: Discussionmentioning

confidence: 64%

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Thermodynamic mixing properties of olivine derived from lattice vibrations

Jong

2009

Phys Chem Minerals

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We use a lattice vibrational technique to derive thermophysical and thermochemical properties of fayalite, Fe 2 SiO 4 . This semi-empirical technique is based on an extension of Kieffer's model to incorporate details of the phonon spectrum. It includes treatment of intrinsic anharmonicity and electronic effects based on crystal field theory. We extend it to predict thermodynamic mixing properties of olivine (Mg,Fe) 2 SiO 4 solid solutions by using results of our previous work on the system MgO-SiO 2 . Achieving this requires a relation between phonon frequency and composition and a composition relation for the energy of the static lattice. Directed by experimental Raman spectroscopic data for specific optic modes in magnesium-iron solid solutions of olivine and pyroxene we use an empirical relation for the composition dependence for phonon frequencies. We show that lattice vibrations have a large effect on the excess entropy and that the static lattice contribution and lattice vibrations have a large impact on excess enthalpy and excess Gibbs energy. Our model indicates that compositional effects in electronic and magnetic properties are negligible. The compositional variation the Néel temperature has a large impact on excess heat capacity for temperatures below 100 K.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 64%

Thermodynamic mixing properties of olivine derived from lattice vibrations

Jong

2009

Phys Chem Minerals

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“…The experimental H T -H 298 values were included in the present assessment. Earlier heat content measurements by Roth and Bertram [17] and Esser et al [18] show internal inconsistencies and are also in conflict with each other. They were therefore excluded from the evaluation.…”

Section: Selected Experimental Datamentioning

confidence: 82%

An assessment of the Fe-O-Si system

Selleby

1997

Metall Mater Trans B

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“…The heat capacity data [25][26][27] in the literature are plotted in Fig. 1, and the available heat content data [28][29][30][31][32][33][34][35][36][37] represented in Fig. 2.…”

Section: Review Of the Literature Data 21 Thermodynamic Properties mentioning

confidence: 99%

Thermodynamic modelling of the Ca–O system including 3rd generation description of CaO and CaO2

Deffrennes

Jakse

Alvares

et al. 2020

Calphad

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A complete thermodynamic description of the Ca-O system is proposed including 3 rd generation modelling of crystalline CaO, liquid and amorphous CaO, and crystalline CaO2. Compared to previous modellings, a more robust description of the thermodynamic properties of the binary phases is achieved using data recently obtained by density functional theory calculations and molecular dynamics simulations. The heat capacity of crystalline CaO is reassessed, leading to a noticeably higher value below the melting point compared to previous modellings and resulting in a slightly higher standard entropy. It is highlighted that the parameters given in terms of polynomial functions of temperature that were employed so far in 3 rd generation models to describe anharmonic contributions in the heat capacity of compounds were not suited to satisfactorily describe the thermodynamic properties of crystalline CaO. It is suggested that this observation can be generalized to most refractory oxides. Alternative terms are proposed in the Gibbs energy function that give more flexibility in fitting the experimental data and lead to more numerically reasonable values for the parameters. The liquid and amorphous CaO phase is described using the two-state model, leading to a significant improvement in the description of its heat capacity. The description of crystalline CaO2 is also improved as only estimates of the thermodynamic properties of the compound were available in previous modellings of the system. Finally, phase equilibria data on the Ca-CaO liquidus is reviewed, and it is highlighted that slight discrepancies in the relatively low temperature measurements can lead to significantly different descriptions of the liquid phase.

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Wärmeinhalt einiger Metalle, Legierungen und Schlackenbildner bei Temperaturen bis 1200°

Abstract: Bestimmung der spezifischen Wärme von Kupfer, Platin, Neusilber‐ und Messinglegierungen, reinem Quarz, Aluminium‐und Kalziumoxyd, künstlichem und natürlichem Magnetit, von reinem Manganoxydul und natürlichem Fayallit zwischen 0 und 1100 bis 1250°.

Cited by 34 publications

References 0 publications

Thermodynamic mixing properties of olivine derived from lattice vibrations

Thermodynamic mixing properties of olivine derived from lattice vibrations

An assessment of the Fe-O-Si system

Thermodynamic modelling of the Ca–O system including 3rd generation description of CaO and CaO2

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