Negative thermal expansion in $Er_2W_3O_{12}$ and $Yb_2W_3O_{12}$ by high temperature X-ray diffraction

Sumithra, S and Tyagi, AK and Umarji, AM (2005) Negative thermal expansion in $Er_2W_3O_{12}$ and $Yb_2W_3O_{12}$ by high temperature X-ray diffraction. In: Materials Science and Engineering B, 116 (1). pp. 14-18.

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Abstract

Negative thermal expansion in the orthorhombic members of $A_2W_3O_{12}$ (A = Er, Yb, Y and Lu) tungstates is measured by high temperature X-ray diffraction. Two new compounds showing contraction in this iso-structural series, $Yb_2W_3O_{12}$ and Er2W3O12 are identified. Axial thermal expansion coefficients of $Y_2W_3O_{12}$, $Er_2W_3O_{12}$, $Yb_2W_3O_{12}$ and $Lu_2W_3O_{12}$ calculated from high temperature X-ray diffraction (473–1073 K) shows rare earth size effect. The linear thermal expansion coefficient decreases as the ‘A’ cation size increases and the thermal contraction along the b-axis becomes more negative.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Diffraction;Thermal properties;Lanthanides;Yttrium;Water
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	18 Oct 2007
Last Modified:	19 Sep 2010 04:40
URI:	http://eprints.iisc.ernet.in/id/eprint/12321

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