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Structure of a new compound KBaB5O9 and photoluminescence characteristics of KBaB5O9:Eu3+

Published online by Cambridge University Press:  01 March 2012

Y. P. Sun ,
Yinxiao Du ,
W. Y. Wang ,
Ming He ,
G. M. Cai  and
X. L. Chen
Y. P. Sun
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
Yinxiao Du
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
W. Y. Wang
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
Ming He
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
G. M. Cai
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
X. L. Chen
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, China
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Abstract

Crystal structure of a new compound KBaB5O9 has been investigated from X-ray powder diffraction data. This compound is isostructural with KSrB5O9 and crystallizes in the monoclinic system with space group P21/c. Unit-cell parameters are a=6.7200(2) Å, b=8.3256(2) Å, c=14.3674(4) Å, and β=92.6103(3) deg. Its structure contains both B3O7 and B3O8 rings, which share a common B atom to form a complex two dimensional network constituting the basic B5O9 unit in the formula. Adjacent networks are bound together by Ba and K atoms, which have eight- and nine-coordinate sites, respectively. In addition, DTA and TGA curves reveal that KBaB5O9 decomposes at 798 °C. Photoluminescence (PL) characteristics of KBaB5O9:Eu3+ have been studied. The PL spectra show the strongest emission at 618 nm and the quench concentration of Eu3+ is 4 at. %.

Keywords

boratecrystal structurepowder diffractionRietveld refinementphotoluminescence
Type
Representative Papers from the Chinese XRD 2006 Conference
Information
Powder Diffraction , Volume 22 , Issue 4 , December 2007 , pp. 292 - 294
Copyright
Copyright © Cambridge University Press 2007

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