Vapour Pressure Equations for the Metallic Elements: 298–2500K

Alcock, C. B.; Itkin, V. P.; Horrigan, M. K.

doi:10.1179/cmq.1984.23.3.309

Cited by 672 publications

(247 citation statements)

References 14 publications

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“…However, the chemical potential of Na gas is only slightly higher than l Na employed in this study, by as little as 0.81 eV per atom, an order of magnitude smaller than that for Co gas (9.43 eV), which can be easily overcome if the entropy term is taken into account. In fact, the vapor pressure of Na is many orders of magnitude higher than that of Co: 1.5 9 10 À6 atm and 5.1 9 10 À2 atm for 300 K and 700 K, 54 respectively. This implies that Na is easily vaporized, producing Na vacancies in Na x CoO 2 with a small energy penalty.…”

Section: Resultsmentioning

confidence: 97%

A First-Principles Study of the Role of Na Vacancies in the Thermoelectricity of Na x CoO2

Yoshiya

Okabayashi

Tada

et al. 2010

Journal of Elec Materi

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First principles calculations using the generalized gradient approximation to density functional theory have been carried out to evaluate formation energies of defects and the resultant changes in electronic structure of NaCoO 2 and Na 0.5 CoO 2 . The calculated formation energies confirm that Na vacancies form readily in this material, particularly through volatilization at elevated temperatures, consistent with experimentally observed behavior. Numerical analysis of the change in charge distribution upon Na vacancy formation shows that the vacancy plays a crucial role in modifying the electronic properties of the material. In these p-type thermoelectric materials, Na vacancies act as a reservoir for the minority carrier (electrons), removing them from the CoO 2 layer while simultaneously increasing the concentration of majority carriers (holes) available for conduction in the CoO 2 layer.

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Section: Resultsmentioning

confidence: 97%

A First-Principles Study of the Role of Na Vacancies in the Thermoelectricity of Na x CoO2

Yoshiya

Okabayashi

Tada

et al. 2010

Journal of Elec Materi

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“…Conversely, the Fish and Lielmezs equation is better: the values obtained (7500 K to 8900 K) belong to the range of high values and are in good accord with previous determinations. Alcock et al [29] indicate that the most precise set in Table 2 is the third one; therefore, the value of 7504 K has to be particularly considered. The first set is less precise, but the value derived for T c is very close to the previous one.…”

Section: Constants Of Referencementioning

confidence: 99%

The Critical Temperature of Aluminum

2009

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The critical temperature, T c , of metals is a fundamental point when vaporization due to high energy exchanges occurs. Although aluminum is a metal often studied as a benchmark for theories, its critical temperature is not known with a high degree of accuracy. Its determination by experiment is difficult as a result of its high value. This paper reviews the existing data and proposes new ones resulting from recent measurements of particular physical properties and recent theoretical approaches. These new estimates lead to the recommended value of T c = (6700 ± 800) K.

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“…The peaks were characterized by the CuMnO 2 phase with a monoclinic structure in the C2/m space group [23]. Considering that the sintering temperature (1353 K) was near the melting point of Mn 2 O 3 (1353 K) and that the vapor pressure of Mn is higher than that of Cu [27], Mn 2 O 3 evaporated easily and the Cu/Mn ratio became nonstoichiometric. …”

Section: Phase Characterizationmentioning

confidence: 99%