Crystal structure and phase transition in the doped super-ionic conductor bismuth vanadate Bi4(V,Fe)2O11 revealed by neutron diffractionстатья
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Аннотация:Bismuth vanadate Bi4V2O11?y doped with Fe was studied
by neutron diffraction. It was shown that Fe substitutes V
only partially and the redundant iron forms an impurity
hematite phase. In the sample with nominal content
Bi4(V0.96Fe0.04)2O11?ya new phase transition within the frame
of the monoclinic structure with the appearing of inversion
center was discovered in the temperature region 200–3008C.
This transition was also confirmed by DTA experiments. Slow
stabilization of the crystal structure with stabilization times of
the order of hours, accompanied by a decrease of the unit cell
volume,wasobserved.AthighlevelofFedoping,inadditionto
thedominanttetragonal g-phase someamount ofthe nanosized
monoclinic a-phase was detected.