Avoiding the invasion of H2O into Y2Mo3O12 by coating with C3N4 to improve negative thermal expansion properties

Physical Chemistry Chemical Physics : PCCP
Xiansheng LiuWeifeng Zhang

Abstract

The hygroscopicity of Y2Mo3O12 has serious influences on its mechanic and negative thermal expansion (NTE) properties. The reported partial ion substitution for Y3+ in Y2Mo3O12 could reduce the hygroscopicity, however, the expected NTE properties disappear disappointedly. In this investigation, it is found that avoiding the invasion of crystal water and extending the NTE temperature range of Y2Mo3O12 to room temperature could be realized together by heating with CO(NH2)2. The X-ray diffraction patterns, infrared absorption spectra, scanning electron microscopy images and X-ray photoelectron spectra suggest the formation of small hydrophobic molecules (C3N4, C, etc.) coated on the surface, which could clog the microchannels in Y2Mo3O12 to avoid the invasion of crystal water. The investigation paves a way to improve the NTE properties by neglecting the influences of water molecules on the stretching vibrations of MoO4 tetrahedra and the transverse vibrations of bridge oxygen atoms.

References

Nov 26, 2009·Chemistry : a European Journal·Dariusz Mitoraj, Horst Kisch
Sep 14, 2011·Advanced Materials·Xiaoyan SongFuxing Yin
Mar 4, 2014·Physical Review Letters·F BridgesGlen R Kowach
May 23, 2014·Physical Chemistry Chemical Physics : PCCP·Xiansheng LiuMingju Chao
Sep 19, 2014·Journal of the American Chemical Society·Lei HuXianran Xing

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Citations

May 28, 2020·Physical Chemistry Chemical Physics : PCCP·Gaojie ZengErjun Liang
Jul 22, 2018·Physical Chemistry Chemical Physics : PCCP·Dongxia ChenErjun Liang

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