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 |
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Publication: | Materials Science and Engineering B |
Publisher: | Elsevier |
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.ac.in/id/eprint/12321 |
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