Abstract
The crystal structure of CuTe2O5,2%Er2O3 was determined from X-ray powder diffraction data using Rietveld refinements. The new structure was solved in monoclinic system through the P21/c space group with parameters equal to a = 6.868 Å, b = 9.316 Å and c = 7.601 Å. The structure can be described as a three dimensional network made of layers parallel to the (010) which contain two kinds of polyhedra TeO4 and TeO5 connected through a corner. These sheets are interconnected by Cu2O10 dimers. A deep spectroscopic study was carried out using the Infrared and Raman techniques in order to prove the presence of different polyhedron CuO6, Te(1)O5, and Te(2)O4E.The dielectric data were analyzed using complex permittivity (ε′), (ε″) and tan (δ) for the sample at various temperatures. The CuTe2O5,2%Er2O3 exhibited strong red-green emissions due to homogeneously occupied Er3+ ions in the host lattice which is confirmed by Photoluminescence.
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