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Energetics of bulk lutetium‐doped Ce 1−x Lu x O 2−x/2 compounds
Author(s) -
Yavo Nimrod,
Sharma Geetu,
Kimmel Giora,
Lubomirsky Igor,
Navrotsky Alexandra,
Yeheskel Ori
Publication year - 2018
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/jace.15489
Subject(s) - lutetium , enthalpy , cerium , sodium molybdate , doping , bismuth , analytical chemistry (journal) , materials science , oxide , chemistry , molybdate , inorganic chemistry , yttrium , thermodynamics , physics , metallurgy , optoelectronics , chromatography
The dissolution enthalpy , Δ H DS , and the formation enthalpy, Δ H f,ox , of bulk lutetium‐doped cerium oxide (LuDC) were studied at 701°C in molten sodium molybdate. For the composition range of Ce 1− X Lu X O 2− X /2 , studied 0 ≤ X ≤ 0.3, the Δ H DS decreases linearly and smoothly with lutetium content according to Δ H DS , kJ/mol = 73.5(1.0)−165.1(5.5)· x ). The enthalpy of formation, Δ H f,ox , becomes more exothermic linearly with lutetium content. No anomaly in Δ H f,ox is observed at low Lu 2 O 3 concentration as reported previously for several other rare‐earth‐doped ceria systems, suggesting possible differences in clustering and microstructure, which may also be related to difference in processing conditions.