BixLa1-xVO4 solid solutions: tuning of electronic properties via stoichiometry modifications
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Nanoscale
ISSN
2040-3364
EISSN
2040-3372
Wydawca
ROYAL SOC CHEMISTRY
DOI
URL
Rok publikacji
2014
Numer zeszytu
4
Strony od-do
2244-2254
Numer tomu
6
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Autorzy
(liczba autorów: 5)
Pozostali autorzy
+ 4
Streszczenia
Język
en
Treść
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.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
613028
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