Synthesis, crystal structure, and preliminary study of luminescent properties of InTbGe2O7
Por:
Juarez-Arellano E.A., Bucio L., Hernandez J.A., Camarillo E., Carbonio R.E., Orozco E.
Publicada:
1 ene 2003
Resumen:
A new indium terbium germanate InTbGe2O7, which is a member of the thortveitite family, was prepared as a polycrystalline powder material by high-temperature solid-state reaction. This new compound crystallizes in the monoclinic system, space group C2/c (No. 15), with unit cell parameters a=6.8818(2)Å, b=8.8774(3)Å, c=9.7892(4)Å, ?=101.401(1)°, V=586.25(4)Å3 and Z=4. Its structure was characterized by Rietveld refinement of powder laboratory X-ray diffraction data. It consists of octahedral sheets that are held together by sheets of isolated Ge2O7 diorthogroups composed of two tetrahedra sharing a common vertex. It contains only one octahedral site occupied by In3+ and Tb+3 cations. The characteristic mirror plane in the thortveitite (Sc2Si2O7) space group (C2/m, No. 12) is not present in this new compound. Besides, in InTbGe 2O7, the Ge-O-Ge angle bridging two diorthogroups is 156.8(2)° as compared to the one in thortveitite, which is 180°. On the other hand, luminescent properties were observed when it is excited with 376. 5nm wavelength. The luminescence spectrum shows typical transitions from the 5D4 multiplet belonging to the trivalent terbium ion. © 2003 Elsevier Science (USA). All rights reserved.
Filiaciones:
Juarez-Arellano E.A.:
Instituto de Física, UNAM, Apdo. Postal 20-364, 01000 México, D.F., Mexico
Bucio L.:
Instituto de Física, UNAM, Apdo. Postal 20-364, 01000 México, D.F., Mexico
Hernandez J.A.:
Instituto de Física, UNAM, Apdo. Postal 20-364, 01000 México, D.F., Mexico
Camarillo E.:
Instituto de Física, UNAM, Apdo. Postal 20-364, 01000 México, D.F., Mexico
Carbonio R.E.:
INFIQC, Depto. de Físico Quim., Ciudad Universitaria, 5000 Córdoba, Argentina
Orozco E.:
Instituto de Física, UNAM, Apdo. Postal 20-364, 01000 México, D.F., Mexico
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