title: Lanthanum molybdate nanoparticles from the Bradley reaction: factors influencing their composition, structure, and functional characteristics as potential matrixes for luminescent phosphors.
abstract: Interaction of lanthanum isopropoxide with molybdenum(VI) alkoxides in La/Mo ratios varying from 3:1 to 1:1 in acetophenon or allyl alcohol as solvents offers nanosized poorly crystalline products of complex composition, where the precipitation of Mo-rich ones is followed by the formation of La-rich ones with conservation of the reaction stoichiometry in total. Thermal treatment of the precipitates at temperatures over 700 °C leads to the formation of stoichiometric phases of the α- and β-La2Mo2O9 compositions. Introduction of smaller Re(3+) cations such as Sm(3+) by doping favors stabilization of the La2-xRExMo2O9 phase with improved crystallinity even after lower-temperature thermal treatment. The doping is successful only when the Re(3+) (Sm(3+), Eu(3+), and Tb(3+)) is introduced as an alkoxide: application of Re(3+)(acac)3 as Re(3+) sources leads to materials free from Re(3+). The produced samples were characterized by XPD, TGA, SEM, and TEM studies as well as the luminescent properties for the Sm(3+)-doped phases.
authors.affiliation: Department of Chemistry, Biocenter SLU , Box 7015, 75007 Uppsala, Sweden.
authors.forename: Sarah
authors.initials: S
authors.lastname: Abtmeyer
authors.forename: Robert
authors.initials: R
authors.lastname: Pązik
authors.forename: Rafał J
authors.initials: RJ
authors.lastname: Wiglusz
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Małecka
authors.forename: Gulaim A
authors.initials: GA
authors.lastname: Seisenbaeva
authors.forename: Vadim G
authors.initials: VG
authors.lastname: Kessler