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Phase formation and luminescent properties of Сa12Al14O33:Eu, Nd prepared by sol–gel method

Сalcium aluminate Ca 12 Al 14 O 33 and phosphors based on it were obtained using sol–gel technology. Complex studies were used to identify the dynamics of phase and structural transformations in the synthesis of Ca 12 Al 14 O 33 . The main stages of the calcium aluminate formation were determined us...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2019-11, Vol.92 (2), p.515-522
Main Authors: Mishenina, Liudmila, Selyunina, Liliya, Broslavskaya, Tat’ana, Slizhov, Yuriy
Format: Article
Language:English
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Summary:Сalcium aluminate Ca 12 Al 14 O 33 and phosphors based on it were obtained using sol–gel technology. Complex studies were used to identify the dynamics of phase and structural transformations in the synthesis of Ca 12 Al 14 O 33 . The main stages of the calcium aluminate formation were determined using thermal analysis, IR spectroscopy and X-ray phase analysis. Solid-phase interaction in the formation of Ca 12 Al 14 O 33 includes the steps of obtaining calcium carbonate and amorphous alumina (800 °C), aluminates of composition Ca 3 Al 2 O 6 and CaAl 2 O 4 (900–1000 °C), and Ca 5 Al 6 O 14 and Ca 4 Al 6 O 13 (1000–1100 °C). Ca 12 Al 14 O 33 begins to form at 1100 °C. The graphic image of the structure was constructed according to the obtained atomic coordinates using the ReX Powder diffraction program. Luminescent properties of the phosphors of the composition Ca 12−(0.05+ x ) Al 14 O 33 :Nd x Eu 0.05 ( x  = 0.025–0.1) were investigated. It was determined that the highest intensity of luminescence is achieved at x  = 0.05. With a further increase in the content of neodyum, there was a concentration quenching of the luminescence. Highlights Сalcium aluminate Ca 12 Al 14 O 33 and phosphors based on it was obtained using sol–gel technology. Based on thermal analysis, IR spectroscopy and X-ray phase analysis, scheme of intermediate products transformation during synthesis was proposed. The highest intensity of luminescent was reached at a neodymium(III) content of 0.05 mol.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-019-04992-7