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Issue 23, 2018
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Crystallographic and spectroscopic evidence for intrinsic distortion in the disordered crystal β-NaGdF4

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Abstract

β-NaREF4 (RE: rare earth metals) is a peculiar crystal due to its intriguing disordered structure. This crystal is usually considered to have an average structure with a space group of P-6 (174). However, a long-term contradiction existing in this system is that the luminescence characteristics do not match the corresponding theoretical predictions based on the average structure. To resolve this contradiction, we proposed a reasonable local structure model clearly showing the local symmetry of the cations based on the measurement of the extended X-ray absorption fine structure of β-NaGdF4. We also observed an intrinsic distortion in the disordered structure that resulted from the disordered arrangement of the Na+ and Gd3+ cations. Furthermore, using Eu3+ as a photoluminescence probe, we concluded that the breakdown in the crystallographic site symmetry originated from the intrinsic distortion of these crystals. This work provides a comprehensive explanation for the contradiction observed in this system and a foundation for further investigations to understand such disordered structures.

Graphical abstract: Crystallographic and spectroscopic evidence for intrinsic distortion in the disordered crystal β-NaGdF4

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Publication details

The article was received on 30 Mar 2018, accepted on 22 May 2018 and first published on 22 May 2018


Article type: Paper
DOI: 10.1039/C8CP02041H
Citation: Phys. Chem. Chem. Phys., 2018,20, 15835-15840
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    Crystallographic and spectroscopic evidence for intrinsic distortion in the disordered crystal β-NaGdF4

    J. Jin, H. Yu, L. Guo, J. Liu, B. Wu, Y. Guo, Y. Fu and L. Zhao, Phys. Chem. Chem. Phys., 2018, 20, 15835
    DOI: 10.1039/C8CP02041H

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