HIGH-TEMPERATURE CHEMISTRY OF THE RUTHENIUM—OXYGEN SYSTEM1
WE Bell, M Tagami - The Journal of Physical Chemistry, 1963 - ACS Publications
WE Bell, M Tagami
The Journal of Physical Chemistry, 1963•ACS PublicationsThe ruthenium-oxygen system has been studied over the temperature range800 to 1500
and over the oxygen pressure range 0.01 to 1.0 atm. Results show that solid Ru02 is the
only stable condensed oxide under the con-ditions of the study. The dissociation pressure of
the oxide reaches 1 atm. at 1540. The effect of oxygen pressure on vapor pressure indicates
that the important vapor species are RuOg and RuOj. From the pressure data, the following
heats of formation, iff 2! s, and standard entropies, S 298, were obtained:—72.2±2.0 …
and over the oxygen pressure range 0.01 to 1.0 atm. Results show that solid Ru02 is the
only stable condensed oxide under the con-ditions of the study. The dissociation pressure of
the oxide reaches 1 atm. at 1540. The effect of oxygen pressure on vapor pressure indicates
that the important vapor species are RuOg and RuOj. From the pressure data, the following
heats of formation, iff 2! s, and standard entropies, S 298, were obtained:—72.2±2.0 …
The ruthenium-oxygen system has been studied over the temperature range800 to 1500 and over the oxygen pressure range 0.01 to 1.0 atm. Results show that solid Ru02 is the only stable condensed oxide under the con-ditions of the study. The dissociation pressure of the oxide reaches 1 atm. at 1540. The effect of oxygen pressure on vapor pressure indicates that the important vapor species are RuOg and RuOj. From the pressure data, the following heats of formation, iff 2! s, and standard entropies, S 298, were obtained:—72.2±2.0 kcal./mole and 12.5±2.0 eu for Ru02 (s),—18.0±4.0 kcal./mole and 63.7±4.0 eu for RuOsig), and—46.7±5.0 kcal./mole and 65.5±5.0 eu for Ru04 (g).
ACS Publications