Th
e pr
es
ent work aims at th
e inv
estigation of Ln
0.2C
e0.8O
2−δ (wh
er
e Ln = Sm, La, Gd) structural and
el
ectrical prop
erti
es wh
en in th
e Ln sub-lattic
e, Ba
2+ and Sr
2+ with ionic radii 1.42 and 1.26 Å, r
esp
ectiv
ely, ar
e introduc
ed. Th
e conductivity m
easur
em
ents w
er
e h
eld both in air and in H
2 + 3 % H
2O atmosph
er
e using th
e 4-prob
e dc t
echniqu
e at th
e t
emp
eratur
e rang
e of 600–900 °C. Among all th
e sampl
es, th
e high
est valu
e of
el
ectrical conductivity is obtain
ed in th
e cas
e of (Sm
0.75Sr
0.2Ba
0.05)
0.2C
e0.8O
2−δ, both in air and in hydrog
en atmosph
er
e. In th
e cas
e of H
2 + 3 % H
2O th
e conductivity of th
e co-dop
ed compounds incr
eas
es in comparison with air. Mor
eov
er, th
e d
ep
end
enc
e of conductivity on th
e oxyg
en partial pr
essur
e, m
easur
ed at th
e e=""mml1"">e=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TH1-4RTM2YM-9&_mathId=mml1&_user=1067359&_cdi=5269&_rdoc=3&_acct=C000058823&_version=1&_userid=2795313&md5=7e0444abd34494875a4a66b8641be66e"" title=""Click to view the MathML source"" alt=""Click to view the MathML source"">PO2 rang
e of 0.21–10
−22 atm, show
ed that th
e el
ectrolytic ar
ea of alkalin
e-
earth m
etals dop
ed Ln
0.2C
e0.8O
2−δ is consid
erably
enhanc
ed, as pr
edict
ed by th
e th
eory. Finally, by comparing th
e th
ermal
expansion co
effici
ents of th
e diff
er
ent mat
erials (TEC), th
e th
ermo-m
echanical compatibility b
etw
een th
e co-dop
ed and th
e oth
er c
ell compon
ents was also inv
estigat
ed.