Re-determination of the crystal structure of Ca2Y8Si6O26 and study on the luminescent properties of Ca2Y8Si6O26:Tb3+ |
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| Authors: | YE Xinyu FANG Ying LIAO Chunfa YANG Youming DENG Gengfeng ZHUANG Weidong |
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| Affiliation: | 1.School of Material and Chemistry Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;2.Department of Chemistry,Shangqiu Normal University,Shangqiu 476000,China;3.National Engineering Research Center for Rare Earth Materials,General Research Institute for Non-ferrous Metals,Beijing 100088,China) |
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| Abstract: | The crystal structure of silicate oxyapatite Ca2Y8Si6O26 was indexed as hexagonal,space group P63/m,a=0.93515 nm,c=0.67872 nm,α=β=90°,γ=120°,V=0.5138692 nm3.Three strong peaks located at 32.079o,32.595o,and 50.104o with d=2.7903,2.74649,1.8194 was in accordance with,(112),and(213) planes.The optimum concentration of Tb3+ in Ca2Y8Si6O26 to yield highest photoluminescence intensity was 10 mol.% of Y3+.The corresponding excitation spectrum consisted of an intense broad band from 220 to 260 nm.The photoluminescence measurements showed that the green emission originated from 5D4-7F5 was predominant in the measured range with strong doublet lines at 543 and 549 nm. |
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| Keywords: | silicate oxyapatite crystal structure luminescence rare earths |
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