In situ high temperature and high-pressure investigation of crystal structure and OH of rutile in jadeite quartzite from the Dabie Mountains, China

Fei, CHEN; Su, Wen; Li, Xiaoguang; Hu, Xinmeng; Jing, Gao

doi:10.18654/1000-0569/2021.12.17

Cited by 2 publications

(10 citation statements)

References 28 publications

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“…At elevated pressures up to 10.8 GPa, the bands at 445 and 610 cm −1 linearly shift to higher frequencies without discontinuity (Figure 7a), indicating the continuous and steady compression of the TiO 6 octahedra. In accordance with previous observations [7,8], the intensity of the 235 cm −1 band decreases with increasing pressure (Figure 6a). This decrease can be explained by the increased ordering of the crystal structure under compression [8].…”

Section: Sample Description and Experimental Methodssupporting

confidence: 93%

“…These bands are consistent with the previously reported vibrational modes of baddeleyitetype TiO 2 [7,9,25], indicating the termination of the transition.…”

Section: Sample Description and Experimental Methodssupporting

confidence: 92%

“…The eclogite is composed of fresh medium-grained garnet, omphacite, phengite, and minor rutile (Figure 2) and has experienced peak metamorphic P-T conditions greater than 3 GPa and 700 °C [15]. In situ high-pressure spectroscopic studies [7][8][9] indicated that the phase transition from rutile to baddeleyite-type TiO 2 begins at 13 GPa and terminates at 21 to 23 GPa at room temperature. Upon decompression, the baddeleyite-type TiO 2 to TiO 2 II transition occurs around 7 GPa and terminates at about 5 GPa.…”

Section: Sample Description and Experimental Methodsmentioning

confidence: 99%

“…The two strong bands at 445 and 610 cm −1 are attributed to the O-Ti-O bending vibration and asymmetric Ti-O stretching vibration, respectively. The two weak bands at 135 and 830 cm −1 are due to the rotation of the TiO6 octahedra and symmetric Ti-O stretching vibration, respectively [1,7,9,24]. In the Raman spectra collected in the in situ high-pressure experiment (Figure 6 and Table 1), three strong bands at 235, 445, and 610 cm −1 can be observed, while the bands initially located at 135, 325, 360, and 830 cm −1 can hardly be detected due to their relatively low intensity.…”

Section: In Situ High-pressure Raman Spectroscopymentioning

confidence: 99%

“…In situ high-pressure spectroscopic studies [7][8][9] indicated that the phase transition from rutile to baddeleyite-type TiO2 begins at 13 GPa and terminates at 21 to 23 GPa at room temperature. Upon decompression, the baddeleyite-type TiO2 to TiO2Ⅱ transition occurs around 7 GPa and terminates at about 5 GPa.…”

Section: Introductionmentioning

confidence: 99%

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In Situ High-Pressure Raman Spectroscopic, Single-Crystal X-ray Diffraction, and FTIR Investigations of Rutile and TiO2II

Gao

et al. 2023

Minerals

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In ultrahigh-pressure (UHP) metamorphic rocks, rutile is an important accessory mineral. Its high-pressure polymorph TiO2II can be a significant indicator of pressure in the diamond stability field. In the present study, in situ high-pressure Raman spectroscopic measurements of natural rutile in UHP eclogite from the main hole of the Chinese Continental Scientific Drilling Project (CCSD) have been conducted up to ~16 GPa. Rutile and recovered TiO2II have also been analyzed via single-crystal X-ray diffraction and FTIR spectroscopy. The results indicate that (1) the phase transition from rutile to baddeleyite-type TiO2 terminates at about 16 GPa under compression at ambient temperature; (2) the metastable TiO2II in the exhumated UHP rocks formed during deep continental subduction can be characterized by a highly distorted octahedral site in the crystal structure. X-ray powder diffraction analyses (with Cu Kα radiation) at ambient conditions are sufficient for identifying the lamellae of TiO2II within natural rutile based on the angles (2θ) of two strong peaks at 25.5° and 31.5°; (3) rutile and recovered TiO2II in the continental slabs can contain certain amounts of water during deep subduction and exhumation. The estimated water contents of rutile in the present study range from 1590 to 1780 ppm of H2O by weight. In the crystal structure of TiO2II, hydrogen can be incorporated close to the long O-O edges (>2.5143 Å) of the TiO6 octahedra. Further studies on the pressure–temperature stability of hydroxyls in rutile and TiO2II may help to understand the transportation and release of water in subducted continental slabs.

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Section: Sample Description and Experimental Methodssupporting

confidence: 93%

“…These bands are consistent with the previously reported vibrational modes of baddeleyitetype TiO 2 [7,9,25], indicating the termination of the transition.…”

Section: Sample Description and Experimental Methodssupporting

confidence: 92%

Section: Sample Description and Experimental Methodsmentioning

confidence: 99%

Section: In Situ High-pressure Raman Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In Situ High-Pressure Raman Spectroscopic, Single-Crystal X-ray Diffraction, and FTIR Investigations of Rutile and TiO2II

Gao

et al. 2023

Minerals

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Raman Spectroscopy Study on the Surface of High Temperature and High Pressure Diamond Crystal in Geology, Rock and Minerals

Li¹,

Chen²,

Wang³

et al. 2022

HSET

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This paper analyses the colour origin and colour change mechanism of high temperature and high-pressure synthetic diamonds through experiments. In this paper, ultraviolet-visible absorption spectroscopy, infrared spectroscopy, photoluminescence spectroscopy, three-dimensional fluorescence spectroscopy, laser Raman spectroscopy and X-ray rocking curve were used for analysis. The results show that it is easy to identify genuine and fake gemstones based on Raman testing of the gemstone itself. The measurement of tiny inclusions with a confocal microscope system can provide information on whether the gemstone is natural or artificially improved, and even trace the origin of the gemstone. Width at half maximum of the Raman spectrum. Phonon "lifetime" can provide information on whether the gemstone is natural or synthetic. The photoluminescence spectrum of gemstones can also provide valuable information about the sample. This article can also identify natural gemstones or synthetic gemstones accordingly.

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In situ high temperature and high-pressure investigation of crystal structure and OH of rutile in jadeite quartzite from the Dabie Mountains, China

Cited by 2 publications

References 28 publications

In Situ High-Pressure Raman Spectroscopic, Single-Crystal X-ray Diffraction, and FTIR Investigations of Rutile and TiO2II

In Situ High-Pressure Raman Spectroscopic, Single-Crystal X-ray Diffraction, and FTIR Investigations of Rutile and TiO2II

Raman Spectroscopy Study on the Surface of High Temperature and High Pressure Diamond Crystal in Geology, Rock and Minerals

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