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The ZrB 2 Volatility Diagram
Author(s) -
Fahrenholtz William G.
Publication year - 2005
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.1551-2916.2005.00599.x
Subject(s) - volatility (finance) , materials science , diagram , vapor pressure , atmospheric temperature range , analytical chemistry (journal) , thermodynamics , chemistry , mathematics , environmental chemistry , physics , statistics , econometrics
A volatility diagram was calculated for temperatures of 1000, 1800, and 2500 K to understand the oxidation of ZrB 2 . Applying the diagram, it can be seen that exposure of ZrB 2 to air produces ZrO 2 (cr) and B 2 O 3 (l) over the temperature range considered. The pressure of the predominant vapor species was predicted to increase from ∼10 −6 Pa at 1000 K, to 344 Pa at 1800 K, and to ∼10 5 Pa at 2500 K. Predictions were consistent with experimental observations that ZrB 2 exhibits passive oxidation below 1200 K, but undergoes active oxidation at higher temperatures due to B 2 O 3 (l) evaporation.