Premium
Thermodynamics of the Zr‐H System
Author(s) -
Wang WeiE,
Olander Donald R.
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb07972.x
Subject(s) - thermodynamics , zirconium , hydride , dissolution , hydrogen , solubility , zirconium hydride , phase (matter) , chemistry , phase boundary , kinetic energy , materials science , inorganic chemistry , physics , organic chemistry , quantum mechanics
The consistencies among the reported univariant hydrogen pressures in the three two‐phase regions of the Zr‐H system, aZr/δZrH 2‐x αZr/βZr, and βRZr/δZrH 2–x , are evaluated with the thermodynamic constraint derived by Speiser. 16 Hydrogen dissolution in αZr is evaluated by checking the consistencies among the Sieverts’law constant, the terminal solubility, and the corresponding two‐phase univariant pressures involving this phase. A modified Sieverts’law is proposed for the complicated behavior of hydrogen dissolution in βZr. An analytical compositiontemperature‐pressure relationship for δ ZrH 2–x is established by using the quasi‐chemical model derived by Arita et al . The thermodynamic constraint of the free energy of formation of ZrH 2 shows that the value measured by Fredricken et al . is the most reliable. In addition, a more accurate free energy of formation of zirconium hydride at the upper phase boundary of αZr/δZrH 2–x two‐phase region is suggested.