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Syntheses and crystal structures of trigonal rare-earth dioxymonocyanamides, Ln2O2CN2 (Ln=Dy, Ho, Er, Tm, Yb)

Published online by Cambridge University Press:  01 March 2012

Min Li ,
Wenxia Yuan ,
Jingfang Wang ,
Cong Gu  and
Huaizhou Zhao
Min Li
Affiliation:
Department of Chemistry, School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China
Wenxia Yuan
Affiliation:
Department of Chemistry, School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China
Jingfang Wang
Affiliation:
Department of Chemistry, School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China
Cong Gu
Affiliation:
Department of Chemistry, School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China
Huaizhou Zhao
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

Trigonal rare-earth dioxymonocyanamides Ln2O2CN2 (Ln=Dy, Ho, Er, Tm, Yb) were synthesized by the modified solid-state metathesis (SSM) method, in which Ln2O3 and melamine C3N6H6 were mixed and heated at 850 °C in vacuumed silica ampoules. Possible chemical reaction pathways are proposed. X-ray diffraction (XRD) patterns of Ln2O2CN2 were refined using the Rietveld method. Compounds Ln2O2CN2 crystallize in the trigonal system with space group P3m1, Z=1, and cell parameters of a and c varying from 3.7267(1) to 3.6407(1) Å and from 8.1848(3) to 8.1152(3) Å, respectively, as Ln atoms change from Dy to Yb. These compounds have stacking structures of Ln2O22+ and CN22− layers, similar to those of previously reported compounds Ln2O2CN2 (Ln=Ce, Pr, Nd, Sm, Eu, Gd). The presence of CN22− ions has been confirmed by infrared spectroscopy, with two characteristic peaks in the vicinity of 651 and 2075 cm−1.

Keywords

rare-earth dioxymonocyanamidesRietveld refinementlayer structureinfrared spectroscopy

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Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 1 , March 2007 , pp. 59 - 63
Copyright
Copyright © Cambridge University Press 2007

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