Eu luminescence in La5Si2BO13 with apatite related structure and magnetic studies in Ln5Si2BO13 (Ln=Gd, Dy)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Eu luminescence in La₅Si₂BO₁₃ with apatite related structure and magnetic studies in Ln₅Si₂BO₁₃ (Ln=Gd, Dy)

Authors:	S. Asiri Naidu B. Raveau

Affiliation:	^a Materials Science Research Centre, Indian Institute of Technology Madras, Chennai 600036, India ^b Laboratoire de Crystallographie et Sciences des Matériaux, ENSICAEN, UniVersité de Caen, CNRS, 6 Bd Maréchal Juin, F-14050 Caen 4, France

Abstract:	Eu³⁺ photoluminescence is studied in La₅Si₂BO₁₃ with apatite related structure. La_5−xEu_xSi₂BO₁₃ [x=0.05, 0.1, 0.3, 0.5, 0.7, 1.0, 2.0] compositions are synthesized. The emission results shows that Eu³⁺ ions occupy two different cationic sites viz., La(1) and La(2). The increase in the intensity of ⁵D₀-⁷F₀ line with increasing Eu³⁺ content shows the preferential occupancy of Eu³⁺ 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.

Keywords:	Photoluminescence Apatite X-ray diffraction Eu³⁺ as a structure probe
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