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May 1994

Volume 23, Issue 3, pp. 385-527


Thermodynamic Properties of the Group IA Elements

C. B. Alcock, M. W. Chase, and V. P. Itkin

J. Phys. Chem. Ref. Data 23, 385 (1994); http://dx.doi.org/10.1063/1.555945 (113 pages) | Cited 4 times

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This review describes thermodynamic properties of condensed phases of the alkali metals, excluding francium for which the amount of information is too limited. The properties considered are: heat capacities from 0 to 1600 K, temperatures and enthalpies of fusion and martensitic transformation in Li and Na; discussion on the Debye temperature and electronic heat capacity coefficient at absolute zero temperature is also included. The paper is the second part of a series. Similar to our previous assessment of the II A group, this paper considers original studies, especially with respect to factors which influence the accuracy and reliability of results. Recommendations derived from such analyses are compared with most advanced previous reviews made at the Institute for High Temperatures (Moscow) and the National Institute of Standards and Technology (Washington). The properties of individual elements of the group are compared and suggestions are made for experimental studies which should improve poorly measured quantities. The review is supplemented by an IBM PC database which contains references, assessed data, brief description of studies, and has facilities for fitting and plotting of data and for adding new information. §
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82.60.Fa Heat capacities and heats of phase transitions
05.70.Fh Phase transitions: general studies

Enthalpies of Formation of Solid Silicon Dichalcogenides

M. S. Chandrasekharaiah and J. L. Margrave

J. Phys. Chem. Ref. Data 23, 499 (1994); http://dx.doi.org/10.1063/1.555960 (9 pages)

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A critical review of the published thermodynamic data for solid SiS2, SiSe2, and Si2Te3 has been made. The most probable values for the enthalpies of formation of these three phases at 298.15 K have been evaluated and an estimate of the uncertainties is made. §
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82.60.Cx Enthalpies of combustion, reaction, and formation

An Assessment of the Reliability of Atomic Weight Data Based on Successive Evaluations Between 1967 and 1993

P. De Bièvre, H. H. Ku, and H. S. Peiser

J. Phys. Chem. Ref. Data 23, 509 (1994); http://dx.doi.org/10.1063/1.555946 (5 pages)

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The reliability of the (standard) atomic‐weight (mean atomic mass) values is quantified based on the analysis of changes made from published improved measurements as they become available for each periodic evaluation. This numerical analysis tests the evaluation procedures and the current reliability of the tables published by the International Union of Pure and Applied Chemistry. One instance of faulty evaluation is highlighted. The post facto test of past performance of evaluations might under appropriate conditions also serve for other data sets such as the fundamental constants of physics or property data for pure elements. §
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32.10.Bi Atomic masses, mass spectra, abundances, and isotopes

International Equations for the Pressure Along the Melting and Along the Sublimation Curve of Ordinary Water Substance

Wolfgang Wagner, A. Saul, and A. Pruss

J. Phys. Chem. Ref. Data 23, 515 (1994); http://dx.doi.org/10.1063/1.555947 (13 pages) | Cited 18 times

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In order to define the phase boundary between the solid phase (ice) and the fluid phase (liquid and gas) of ordinary (light) water substance in pressure‐temperature coordinates, correlation equations for the pressure along the melting curve of the various modifications of ice as well as for the pressure along the sublimation curve are presented. The five equations for the melting pressure of the ice phases, ice I, ice III, ice V, ice VI, and ice VII, which only contain one to three fitted coefficients, cover the pressure range from the ‘‘normal’’ triple point to 20000 MPa. In this entire range the equations represent the selected measurements of the melting pressure within their experimental uncertainty. The 2‐coefficient equation for the sublimation pressure covers the temperature range from 190 K to the triple point (273.16 K). The equations correspond to the new International Temperature Scale of 1990 (ITS‐90). All these equations form the basis of the revised release on the pressure along the melting and sublimation curves of ordinary water substance. A verbatium copy of this release is presented in the Appendix of this paper. §
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05.70.Ce Thermodynamic functions and equations of state
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