Predicted high-temperature properties of rubidium

Abstract

A virial equation of state for rubidium with coefficients through the fifth virial is predicted from experimental PVT data of potassium and cesium by application of the thermodynamic similarity principle. Exact thermodynamic relationships involving virial coefficients and other selected literature properties are used to generate saturation and superheat properties of rubidium vapor. Values of enthalpy, entropy, specific heat, and specific volume are tabulated for some 200 selected states in the temperature range from 1300°to 2400°F. and in the pressure range from 0.2 to 28 atm.

A new equation of state for rubidium vapors at temperatures up to 1600 K and pressures up to 4 MPa

“…Also well known is the paper of Stone et al [3] who give TDP tables for rubidium vapor calculated up to 1590 K and 2.85 MPa using the equation of state in the virial form, , (1) with four temperature functions B(T), C(T), D(T), and E(T).…”

“…No experimental pvT-data for rubidium vapor were available to Stone et al [3], and they determined the temperature functions of equations of state by averaging the values for potassium and cesium vapors, which were "experimentally" obtained by them previously, for example, B Rb = 0.49B Cs + 0.51B K .…”

“…based on the experimental data of Tepper et al [4] was used in [3] to calculate the saturation pressure p s (T) of rubidium vapor. In addition, Stone et al [3] used the third law of thermodynamics for Eq.…”

“…In addition, Stone et al [3] used the third law of thermodynamics for Eq. (2) to estimate the sublimation heat of rubidium vapor while employing the p s (T)-data for different temperature ranges.…”

Electro- and thermotransport of carbon in iron-nickel alloys

“…Numerous investigators (2-11) have studied the relationship between the composition, microstructure and mechanical properties of these materials. Extensive work has also been done on the importance of the carbon and nitrogen contents of these steels on the mechanical properties (6)(7)(8)(9)(10) and the microstructural stability (12)(13)(14)(15).…”