Preparation, structure and
luminescence properties of the Ln1-xCaxVO4, Ln
= La, Eu (0 ≤ x ≤ 0.2)
phases
Chem.
Met. Alloys 9 (2016)
119-122
https://doi.org/10.30970/cma9.0340
Alina A. SLEPETS, Tetiana A. VOITENKO, Sergiy A.
NEDILKO, Sergiy G. NEDILKO, Oksana V. CHUKOVA
Ln1-xCaxVO4, Ln
= La, Eu (0 ≤ x ≤
0.2) samples were prepared by the aqueous nitrate-citrate sol-gel route using
citric acid as complexing agent. Thermal analysis was used to explain the
thermal decomposition behavior and crystallization process of the Eu0.9Ca0.1VO4 sample.
Single-phase samples of the investigated compounds formed at 630°C. According
to X-ray diffraction data, a monoclinic phase of Ca2+-doped
LaVO4 and a tetragonal phase of Ca2+-doped EuVO4
nanoparticles were obtained. Scanning
electron microscopy images showed particles of different shapes with diameters
from 100 to 500 nm, the crystallite surface being loose and porous. The
photoluminescence spectra contain wide bands of matrix emission and narrow
lines due to f-f transitions in the Ln3+
ions.
Flow-chart for the preparation of
orthovanadates by the sol-gel method.
Keywords
Ca2+-doped
RVO4 / Nanoparticles /
Sol-gel process / Thermal analysis / Scanning
electron microscopy SEM