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Growth, structural and thermophysical properties of TbNbO4 crystals

Abstract

A new single-crystal TbNbO4 with monoclinic structure has been grown successfully using the Czochralski method for the first time. The material belongs to space group C2/c, with the unit-cell parameters of a = 7.173(3) Å, b = 11.186(5) Å, c = 5.156(2) Å and β = 131.082(3)o. Thermal properties of the as-grown TbNbO4 crystal, including specific heat, thermal expansion coefficient, thermal diffusion coefficient, and the thermal conductivity, were measured systematically. TbNbO4 crystal exhibits strong anisotropic thermal expansion, a negative thermal expansion along c direction is presented, zero thermal expansion coefficient in some directions can be obtained. The emission and absorption spectrum were also measured. The strongest emission peak in the green spectral domain of TbNbO4 corresponding to the 5D4 → 7F5 transition of Tb3+ is located at 549 nm. In the range of 350-1500 nm, the as-grown TbNbO4 crystal has a low absorption. X-ray photoelectron spectroscopy (XPS) was used to study the valence of the elements in TbNbO4 crystal, the result shows that there are two different valence states of Tb in the as-grown crystal.

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Publication details

The article was received on 02 Dec 2017, accepted on 31 Jan 2018 and first published on 31 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE02072D
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Growth, structural and thermophysical properties of TbNbO4 crystals

    J. Guo, J. Ren, R. Cheng, Q. Dong, C. Gao, X. Zhang and S. Guo, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE02072D

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