Preprint Article Version 1 This version is not peer-reviewed

Microscopic Laser Raman and Infrared Spectroscopic Study of Tengchongite

Version 1 : Received: 26 January 2020 / Approved: 27 January 2020 / Online: 27 January 2020 (07:53:31 CET)

How to cite: Qiu, L.; Hu, B.; Fan, G. Microscopic Laser Raman and Infrared Spectroscopic Study of Tengchongite. Preprints 2020, 2020010322 (doi: 10.20944/preprints202001.0322.v1). Qiu, L.; Hu, B.; Fan, G. Microscopic Laser Raman and Infrared Spectroscopic Study of Tengchongite. Preprints 2020, 2020010322 (doi: 10.20944/preprints202001.0322.v1).

Abstract

Tengchongite is a uranyl molybdate uranium mineral and it was found and named by Chen 1985.No more scholars studied on tengchongite after Chen’s work, The identification of this mineral has only been confirmed by single crystal X-ray diffraction. In the paper, micro laser Raman spectroscopy and infrared spectroscopy are used to identify the spectroscopy properties of tengchongite. The studies fill in the gaps of more than 30 years in terms of the molecular spectroscopy research of tengchongite. The mineral has an ideal model of Ca(UO2)6(MoO4)2O5•12H2O its bands attributed to the vibrating units are clearly identified in the Raman spectrum. Symmetric stretching modes at 812 cm-1 and 839 cm-1 are assigned to ν1 (UO2)2+ ,The ν3 antisymmetric stretching modes of (UO2)2+ are observed at 896 cm-1, Symmetric stretching modes at 419-1 and 440 cm-1 are assigned to ν2 (UO2)2+ .Symmetric stretching modes at 919cm-1 are assigned to ν1(MoO4)2-,The ν3 antisymmetric stretching modes of (MoO4)2- are observed at 752 cm-1, the in-plane ν2(MoO4)2-and the out-of-plane ν4(MoO4)2- bending modes are at 169 cm-1 and 254 cm-1. IR spectrum of tengchongite shows the major uranyl band at 858 cm-1 and 693 cm-1, Mo-O bonds are observed at about 985 cm-1 and 780 cm-1, and H2O groups are present with a wide range peaks from 3100 cm-1 to 3500 cm-1 and 1647 cm-1, and the band at 1432.4 cm-1 is probably due to the stretching vibration hydroxyl (OH-1), therefore, tengchongite contains may include hydroxyl and its chemical formula needs to be modified .

Subject Areas

Tengchongite; microscopic laser Raman spectroscopy; infrared spectroscopy; Yunnan Province

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