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Issue 4, 2014
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BixLa1−xVO4 solid solutions: tuning of electronic properties via stoichiometry modifications

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Abstract

BixLa1−xVO4 solid solutions were obtained in the form of fine powder via a microwave-assisted hydrothermal route. The presence of a solid solution in the studied system was confirmed using X-ray diffraction (XRD) and optical spectroscopy techniques. Pure BiVO4 and LaVO4 were obtained in the monoclinic form, whereas solid solutions in the tetragonal, zircon-type structure. The optical band gap dependence on the composition of the solid solution is parabolic, thus there is a possibility to tune this parameter in a wide concentration range, from 2.4 to 4.0 eV. An absorption coefficient maximum is also concentration-dependent, possibly, due to the structural disorder of the samples. Solid solutions with Bi3+ concentration between 11.94 and 32.57 at.% exhibit intense, green luminescence. This indicates the presence of Bi-originated electronic states within the band gap. The value of the conduction band edge potential, measured by both electrochemical impedance spectroscopy and work function measurements, is concentration-independent. Moreover, solid solutions exhibit a photoelectrochemical photocurrent switching effect, thus they may be promising materials for molecular electronics and as dioxygen activators.

Graphical abstract: BixLa1−xVO4 solid solutions: tuning of electronic properties via stoichiometry modifications

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Article information


Submitted
04 Nov 2013
Accepted
02 Dec 2013
First published
03 Dec 2013

Nanoscale, 2014,6, 2244-2254
Article type
Paper
Author version available

BixLa1−xVO4 solid solutions: tuning of electronic properties via stoichiometry modifications

P. Kwolek, K. Pilarczyk, T. Tokarski, K. Lewandowska and K. Szaciłowski, Nanoscale, 2014, 6, 2244
DOI: 10.1039/C3NR05871A

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