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Optical and magnetic properties of EuSi2O2N2

Published online by Cambridge University Press:  01 February 2006

Y.Q. Li ,
K.V. Ramanujachary ,
S.E. Lofland ,
G. de With  and
H.T. Hintzen
Y.Q. Li
Affiliation:
Laboratory of Materials and Interface Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
K.V. Ramanujachary
Affiliation:
Department of Chemistry and Biochemistry, Rowan University, Glassboro, New Jersey 08028-1701
S.E. Lofland
Affiliation:
Department of Physics and Astronomy, Rowan University, Glassboro, New Jersey 08028-1701
G. de With
Affiliation:
Laboratory of Materials and Interface Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
H.T. Hintzen*
Affiliation:
Laboratory of Materials and Interface Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

A new europium-silicon-oxynitride compound EuSi2O2N2 was obtained by a reaction of Eu2O3, SiO2, and α–Si3N4 at 1300 °C under a nitrogen atmosphere. EuSi2O2N2 is indexed on a monoclinic unit cell with a = 13.151(5) Å, b =17.311(5) Å, c = 7.956(2) Å, β = 104.12(4)°, and V = 1756.56 Å3. EuSi2O2N2 shows a highly pure yellow color associated with a very steep drop in the reflection spectrum with an optical absorption edge at about 512 nm (2.43 eV). On the other hand, EuSi2O2N2 can be efficiently excited in the visible range 370–485 nm and shows a broad band emission peaking at about 568 nm corresponding to the Eu2+ 4f65d1 → 4f7 transition. EuSi2O2N2 shows paramagnetic Curie behavior with an experimental magnetic moment of 7.89(3) μB in accordance with 7 unpaired spins of Eu2+. Additionally, no magnetic ordering can be observed down to 5 K. The divalent nature of the Eu ions in EuSi2O2N2 is evident from both luminescence and magnetic properties.

Keywords

Magnetic propertiesOptical propertiesX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 396 - 401
Copyright
Copyright © Materials Research Society 2006

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