Chemical Thermodynamics of Americium by Robert J. Silva

By Robert J. Silva

This is often the second one quantity in a chain of serious reports of the chemical thermodynamic information of these parts of specific value within the protection evaluation modeling of high-level radioactive waste garage and disposal amenities. the target of those stories is to supply a collection of trustworthy thermodynamic facts that may be used to explain the behaviour of those parts less than stipulations correct for radioactive waste disposal structures and the geochemical environments. the current quantity is a evaluate of experimental information mentioned within the literature for americium. On a couple of events, the place no info existed, comparisons and estimates have been made in accordance with experimental facts on analog lanthanide parts. the elemental philosophy used to be to boost a minimal set of stable stages and resolution species of americium that might healthy all experimental info being reviewed

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Where necessary for the discussion, values of experimentally measured temperatures are reported after conversion to the IPTS-68 [69COM]. 15 K. 4. Fundamental physical constants T h e fundamental physical constants are taken from a recent publication by CODATA [86COD]. 7. 7: Fundamental physical constants. These values have been taken from CODATA [86COD]. T h e digits in parentheses are the one-standard-deviation uncer­ tainty in the last digits of the given value. 566370614... 854187817... 380658(12) 1 0 - C .

For example, in the U-O-F class of compounds and complexes, a typical sequence would be U O F ( c r ) , U O F ( c r ) , U O F ( g ) , UU2F(aq), U 0 F + , U 0 F ( a q ) , U 0 F ( c r ) , U 0 F ( g ) , U 0 F " , U O . F * " , U 0 F ( c r ) , etc. For­ mulae with identical stoichiometry are in alphabetical order of their designators. 4 + 2 2 2 II. 9. 2 Reference 2 2 2 2 4 2 3 4 2 3 6 codes The references cited in the review are ordered chronologically and alphabetically by the first two authors within each year, as described by CODATA [87GAR/PAR].

101325 M P a ) . T h e difference between the t h e r m o d y n a m i c d a t a for the two s t a n d a r d state pressures is not large and lies in most cases within the uncertainty limits. It is nevertheless essential to make the correc­ tions for the change in the s t a n d a r d state pressure in order to avoid inconsistencies and propagation of errors. In practice the parameters affected by the change be­ tween these two s t a n d a r d state pressures are the Gibbs energy and entropy changes of all processes t h a t involve gaseous species.

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