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Issue 6, 2016
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Structure, phase transition and negative thermal expansion in ammoniated ZrW2O8

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Abstract

In the present work, we have developed an effective way to control the thermal expansion of ZrW2O8 by the insertion of NH3 into the void of the framework structure. Neutron powder diffraction (NPD) and XPS studies reveal that N is bonding to W in the ammoniated ZrW2O8 and retains the original structure with the space group P213. This kind of ammoniation improves the thermal stability, raised the phase transition temperature about 50 K, and weakens the negative thermal expansion (NTE) from −7.8 × 10−6 K−1 to −2.1 × 10−6 K−1. These behaviors account for bonding of NH3 to the neighboring atoms of ZrW2O8, and hinder the rocking motion of the corner shared polyhedral structure.

Graphical abstract: Structure, phase transition and negative thermal expansion in ammoniated ZrW2O8

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Publication details

The article was received on 28 Jan 2016, accepted on 21 Mar 2016 and first published on 22 Mar 2016


Article type: Research Article
DOI: 10.1039/C5QI00292C
Inorg. Chem. Front., 2016,3, 856-860

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    Structure, phase transition and negative thermal expansion in ammoniated ZrW2O8

    W. Cao, Q. Huang, Y. Rong, Y. Wang, J. Deng, J. Chen and X. Xing, Inorg. Chem. Front., 2016, 3, 856
    DOI: 10.1039/C5QI00292C

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