Issue 98, 2016

Phase transition and negative thermal expansion in orthorhombic Dy2W3O12

Abstract

New materials with suitable negative thermal expansion (NTE) are much desired to control thermal expansion in solids. In the present study, we determined the phase transition temperature of Dy2W3O12 from the monoclinic phase to the orthorhombic phase at 996 °C. The orthorhombic phase could be retained by quenching, and further high temperature XRD and synchrotron radiation X-ray powder diffraction (SXRD) experiments revealed that Dy2W3O12 shows NTE (−2.6 × 10−5 °C−1) in the temperature range of 150–500 °C, which is the largest negative thermal expansion in the A2W3O12 family (A = rare earth element). A possible NTE mechanism and enhanced NTE were elucidated by the transverse thermal motion of the bridge oxygen in A–O–W linkages accompanied by distortion of the polyhedra with large Dy3+ on the A site.

Graphical abstract: Phase transition and negative thermal expansion in orthorhombic Dy2W3O12

Supplementary files

Article information

Article type
Paper
Submitted
23 Aug 2016
Accepted
28 Sep 2016
First published
29 Sep 2016

RSC Adv., 2016,6, 96275-96280

Phase transition and negative thermal expansion in orthorhombic Dy2W3O12

W. Cao, Q. Li, K. Lin, Z. Liu, J. Deng, J. Chen and X. Xing, RSC Adv., 2016, 6, 96275 DOI: 10.1039/C6RA21136D

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