The NASICON-ty
pe com
pound La
1/3Z
r2(PO
4)
3 has been studied by the
rmal X-
ray diff
raction. It wasfound to exhibit, a
round 1000
C, a
reve
rsible
phase t
ransition f
rom
Premac
r.gif"> to
Premac
r.gif">
c1 due to a modification ofthe lanthanum dist
ribution in the [Z
r2(PO
4)
3]
- netwo
rk. This evolution was confi
rmed by
31P NMR ex
pe
riments
pe
rfo
rmed on quenched La
1/3Z
r2(PO
4)
3 sam
ples (
T = 700 and 1000
C) and com
pa
red to
room-tem
pe
ratu
re
results. To com
plete this study, im
pedance s
pect
rosco
py measu
rements we
re ca
rried outbetween 330 and 730
C, confi
rming the La
3+ mobility in the NASICON netwo
rk.