Crystal structure and phase transition in the doped super-ionic conductor bismuth vanadate Bi4(V,Fe)2O11 revealed by neutron diffraction.

Autor:	Golosovsky, I. V., Golubko, N. V., Mosunov, A. V., Politova, E. D., Murasheva, V. V., Fortalnova, E. A., Rusakov, V. S., André, G., Porcher, F.
Předmět:	BISMUTH compounds NEUTRON diffraction HEMATITE CRYSTALS CRYSTAL structure research
Zdroj:	Physica Status Solidi (B); Jul2013, Vol. 250 Issue 7, p1345-1351, 7p
Abstrakt:	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− y a new phase transition within the frame of the monoclinic structure with the appearing of inversion center was discovered in the temperature region 200-300 °C. 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, was observed. At high level of Fe doping, in addition to the dominant tetragonal γ-phase some amount of the nanosized monoclinic α-phase was detected. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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