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Sep 1998

Volume 27, Issue 5, pp. 855-991


Simultaneous Assessment of the YBa2Cu3O6+z Thermodynamics Under the Linear Error Model

E. B. Rudnyi, V. V. Kuzmenko, and G. F. Voronin

J. Phys. Chem. Ref. Data 27, 855 (1998); http://dx.doi.org/10.1063/1.556023 (34 pages)

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About 3000 experimental points obtained in 220 miscellaneous experiments published in 57 papers have been processed simultaneously in order to obtain the most reliable Gibbs energy of the YBa2Cu3O6+z solid solution in the temperature range from 250 to 1300 K. A part of this solution is well-known as the “Hi-Tc Y123” phase. All other thermodynamic properties of the solution including the conditions for the tetragonal-orthorhombic phase transition and the miscibility gap at lower temperatures, are derived from the assessed Gibbs energy. The linear error model introduced recently by one of the authors has been employed for the simultaneous assessment. The results obtained are compared with those of the conventional weighted least squares method and the benefit of the new approach is discussed. Another problem in simultaneous assessment that is also considered is visualizing the quality of the fit. New types of graphs (partly based on the linear error model) that facilitate visualizing the quality of the fit are presented. (A critical review with 72 references.) © 1998 American Institute of Physics and American Chemical Society.
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01.30.Kj Handbooks, dictionaries, tables, and data compilations
74.72.-h Cuprate superconductors
74.25.Bt Thermodynamic properties
64.70.K- Solid-solid transitions
82.60.Cx Enthalpies of combustion, reaction, and formation
65.40.-b Thermal properties of crystalline solids
65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.
65.80.-g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems
02.50.-r Probability theory, stochastic processes, and statistics

Electron Interactions With C3F8

L. G. Christophorou and J. K. Olthoff

J. Phys. Chem. Ref. Data 27, 889 (1998); http://dx.doi.org/10.1063/1.556024 (25 pages) | Cited 5 times

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To aid the many and diverse applications for which perfluoropropane (C3F8) is suited, we critically evaluate and synthesize existing knowledge on electron scattering and electron energy-loss processes for the C3F8 molecule, and provide recommendations for the most reliable data. We also draw attention to electron-interaction data that are not presently available, but are needed for modeling the behavior of C3F8 in practical uses, especially plasma processing. © 1998 American Institute of Physics and American Chemical Society.
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01.30.Kj Handbooks, dictionaries, tables, and data compilations
34.80.-i Electron and positron scattering

Thermodynamic Properties of Import to Environmental Processes and Remediation. I. Previous Thermodynamic Property Values for Cadmium and Some of Its Compounds

Donald G. Archer

J. Phys. Chem. Ref. Data 27, 915 (1998); http://dx.doi.org/10.1063/1.556032 (32 pages)

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The sources of previous thermodynamic property values are detailed for cadmium and some compounds of cadmium that might be expected as derivative from anthropogenic introduction of cadmium into the environment or are required for calculation of thermodynamic properties of cadmium-containing systems. Included are descriptions of the sources of information and methodology used to obtain the values for these compounds reported in the NBS series of publications loosely and collectively referred to as the NBS Thermodynamics Tables. © 1998 American Institute of Physics and American Chemical Society.
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01.30.Kj Handbooks, dictionaries, tables, and data compilations
65.20.-w Thermal properties of liquids
65.40.gd Entropy

Reference Correlation of the Viscosity of Propane

E. Vogel, C. Küchenmeister, E. Bich, and A. Laesecke

J. Phys. Chem. Ref. Data 27, 947 (1998); http://dx.doi.org/10.1063/1.556025 (24 pages) | Cited 12 times

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A new representation of the viscosity of propane includes a zero-density correlation and an initial-density dependence correlation based on the kinetic theory of dilute gases and on the Rainwater–Friend theory. The higher density contributions of the residual viscosity in the representation are formed by a combination of double polynomials in density and reciprocal temperature, and a free-volume term with a temperature-dependent close-packed density. The full surface correlation is based on a set of primary experimental data selected as a result of a critical assessment of the available information from 37 original viscosity studies. The review refers to 96 citations altogether. The validity of the representation extends from the triple point to 600 K and 100 MPa in accordance with the modified Benedict–Webb–Rubin equation of state. The uncertainty of the representation varies from ±0.4% for the viscosity of the dilute gas phase between room temperature and 600 K, to about ±2.5% for the range 100–475 K up to about 30 MPa, and to about ±4% for points outside this range. Tables of the viscosity according to the representative equations at selected temperatures and pressures and along the saturation line provide easy reference as well as the validation of computer codes. © 1998 American Institute of Physics and American Chemical Society.
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01.30.Kj Handbooks, dictionaries, tables, and data compilations
51.10.+y Kinetic and transport theory of gases
51.20.+d Viscosity, diffusion, and thermal conductivity
51.30.+i Thermodynamic properties, equations of state

Thermodynamic Properties of Aqueous Magnesium Chloride Solutions From 250 to 600 K and to 100 MPa

Peiming Wang, Kenneth S. Pitzer, and John M. Simonson

J. Phys. Chem. Ref. Data 27, 971 (1998); http://dx.doi.org/10.1063/1.556026 (21 pages)

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A new general model that describes the thermodynamic properties of MgCl2(aq) has been developed from a global fit to experimental results, including isopiestic molalities, vapor pressure measurements, freezing-point depressions, enthalpies of dilution, heat capacities, and densities, for this system. The model is based on a recent ion-interaction treatment with extended higher-order virial terms, and on experimental results from 240 to 627 K at pressures to 100 MPa and molalities to 25 mol⋅kg−1. © 1998 American Institute of Physics and American Chemical Society.
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01.30.Kj Handbooks, dictionaries, tables, and data compilations
65.20.-w Thermal properties of liquids
65.40.gd Entropy
64.70.D- Solid-liquid transitions
64.75.-g Phase equilibria
64.30.-t Equations of state of specific substances
62.50.-p High-pressure effects in solids and liquids
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