Eu{sup 3+} luminescence in La{sub 5}Si{sub 2}BO{sub 13} with apatite related structure and magnetic studies in Ln{sub 5}Si{sub 2}BO{sub 13} (Ln=Gd, Dy)

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.05.034· OSTI ID:21421584

Asiri Naidu, S ^[1]; Raveau, B ^[2]

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1. Materials Science Research Centre, Indian Institute of Technology Madras, Chennai 600036 (India)
2. Laboratoire de Crystallographie et Sciences des Materiaux, ENSICAEN, UniVersite de Caen, CNRS, 6 Bd Marechal Juin, F-14050 Caen 4 (France)

Eu{sup 3+} photoluminescence is studied in La{sub 5}Si{sub 2}BO{sub 13} with apatite related structure. La{sub 5-x}Eu{sub x}Si{sub 2}BO{sub 13} [x=0.05, 0.1, 0.3, 0.5, 0.7, 1.0, 2.0] compositions are synthesized. The emission results shows that Eu{sup 3+} ions occupy two different cationic sites viz., La(1) and La(2). The increase in the intensity of {sup 5}D{sub 0}-{sup 7}F{sub 0} line with increasing Eu{sup 3+} content shows the preferential occupancy of Eu{sup 3+} in La(2) site due to the existence of short La(2)-O(4) (free oxide ion) bond. The observation of antiferromagnetic interactions in Gd and Dy analogues supports the structural features elucidates from photoluminescence studies. - Graphical abstract: In La{sub 5}Si{sub 2}BO{sub 13}, the La(1)O{sub 9} polyhedra share faces, the La(2)O{sub 7} polyhedra are connected through corners and La(2)O{sub 7} and La(1)O{sub 9} polyhedra are connected to each other by edge sharing along 'z'-axis.

• OSTI ID: 21421584
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 8; Other Information: DOI: 10.1016/j.jssc.2010.05.034; PII: S0022-4596(10)00237-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
APATITES
BORON COMPOUNDS
DYSPROSIUM COMPOUNDS
EUROPIUM IONS
GADOLINIUM COMPOUNDS
INTERACTIONS
LANTHANUM COMPOUNDS
OXIDES
PHOTOLUMINESCENCE
SILICON COMPOUNDS
X-RAY DIFFRACTION
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
EMISSION
IONS
LUMINESCENCE
MAGNETISM
MINERALS
OXYGEN COMPOUNDS
PHOSPHATE MINERALS
PHOTON EMISSION
RARE EARTH COMPOUNDS
SCATTERING