Oxygen potential of (U0.88Pu0.12)O2± and (U0.7Pu0.3)O2± at high temperatures of 1673–1873 K

Oxygen Potentials and Defect Chemistry in Nonstoichiometric (U,Pu)O2

“…Almost all data that were measured in the 1960's and 1970's had large uncertainty. Recently Kato et al (2005Kato et al ( , 2009bKato et al ( , 2011bKato et al ( , 2011c accurately obtained a large number of data in (U,Pu)O 2 by insitu analysis. Fig.2 shows the measurement data as functions of O/M ratio and Pu content.…”

“…Here, the measurement technique by the gas equilibrium method is explained. A thermo-gravimetry and differential thermal analysis system (TG-DTA) was put in glove box and used to measure oxygen potential (Kato et al, 2005(Kato et al, , 2009b(Kato et al, , 2011b(Kato et al, , 2011c. The oxygen partial pressure of the flowing gas was monitored at the inlet and outlet of the apparatus using stabilized zirconia oxygen sensors.…”

“…The H 2 /H 2 O mixture gives control at lower oxygen potential. Previously, Kato et al (2011bKato et al ( , 2011c) used the H 2 /H 2 O mixture to measure hyper-and hypo-stoichiometric (U,Pu)O 2 . Considering the reaction of eq.…”

“…(7) can be applied in the near stoichiometric region. Data for (U,Pu)O 2 in the near stoichiometric region have been obtained by Kato et al (2011bKato et al ( , 2011c. Curves of Fig.4.…”

“…In previous studies (Kato et al, 2009a(Kato et al, , 2011b(Kato et al, 2011c, the stoichiometric compositions in (U,Pu)O 2 have been determined based on defect chemistry. The relationship between oxygen partial pressure and deviation x from stoichiometric composition has been analyzed in non-stoichiometric oxides.…”