44
1 – Description of ionic crystals
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Figure 11 – Brouwer diagram for (a) pure ThO 2 and (b) doped ThO 2 .
2. Doped ThO 2
a. The equilibria for the intrinsic atomic and electronic disorders as well
as the equilibria with the gas phase remain unchanged.
The doping reaction is
Y 2 O 3 $ 2Y ′
Zr + 3O
#
O + V
••
O
The electroneutrality relation becomes
n + 2[O′′ i ] + [Y ′
Zr ] = p + 2[V
••
O ]
Hereafter, [Y ′
Zr ] is denoted D m .