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Unusual crystal-lattice behaviour of CeSb at ambient pressure

Authors:

Abdul Hannan ,

Shahjalal University of Science & Technology, BD
About Abdul

Department of Physics, School of Physical Sciences, Shahjalal University of Science & Technology, Sylhet-3114, Bangladesh.

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Md. Shariful Islam,

Shahjalal University of Science & Technology, BD
About Md. Shariful
Department of Physics, School of Physical Sciences, Shahjalal University of Science & Technology, Sylhet-3114, Bangladesh
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Sultana Rokeya Parvin,

Govt. Agragami Girls High School, BD
About Sultana Rokeya
Govt. Agragami Girls High School, Sylhet, Bangladesh.
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Md. Jakir Hossen

Shahjalal University of Science & Technology, BD
About Md. Jakir
Department of Physics, School of Physical Sciences, Shahjalal University of Science & Technology, Sylhet-3114, Bangladesh
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Abstract

The temperature dependence of lattice constant of CeSb in the temperature range from 17 K to 280 K as measured by the X-ray diffraction technique exhibits an unusual minimum around 45 K. The origin of this exotic lattice behaviour has been disclosed in this article. Our model analysis shows that two types of Ce ions with different sizes, called Γ7and Γ8 Ce ions, appear in the CeSb lattice in its paramagnetic phase to exhibit its unusual temperature dependence of lattice constant. The calculated lattice constant difference  (a7(0)- a8(0)) at 0 K between a CeSb lattice with pure Γ7 Ce ions and a CeSb lattice with pure Γ8 Ce ions is 0.0081 Å, which is very small. The lattice contraction δ, defined by  δ={(a7(0)- a8(0)}/a7(0) in the present analysis, is 1.263´10-3 .

Keywords: Cerium monopnictides, CeSb, low carrier-density, p-f mixing, X-ray diffraction

J.Natn.Sci.Foundation Sri Lanka 2010 38 (3):201-205

Doi: 10.4038/jnsfsr.v38i3.2310

 

How to Cite: Hannan, A., Islam, M.S., Parvin, S.R. and Hossen, M.J., 2010. Unusual crystal-lattice behaviour of CeSb at ambient pressure. Journal of the National Science Foundation of Sri Lanka, 38(3), pp.201–205. DOI: http://doi.org/10.4038/jnsfsr.v38i3.2310
Published on 29 Sep 2010.
Peer Reviewed

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