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- W4308554108 abstract "The structure type and water content of opal will affect its stability and value. When the structure is Opal-A type, its value is higher. When the water content is high, its stability will decrease. The structural attribution and water distribution of pink, yellow, green, blue and purple opal have been investigated by several methodologies like powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier transform near infrared spectroscopy (FT-NIR). The results show that all the opal samples are CT type, among which the green sample has the highest crystallinity. The water contents of the opals range from 3.06 to 8.78%. The distribution and quantity of molecular water (H2Omol) and silanols (H2OSiOH) are calculated semi-quantitatively according to intensity of 4500 cm-1 and 5200 cm-1 peaks in the near infrared region, and it is found that the water in all the samples is basically composed of molecular water. The precipitation mechanism for opal formation results in different structural types, and the difference in structural composition leads to different water contents. This work provides a theoretical basis for the future study of the opal metallogenic environment." @default.
- W4308554108 created "2022-11-12" @default.
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- W4308554108 date "2022-01-01" @default.
- W4308554108 modified "2023-09-30" @default.
- W4308554108 title "Water characterization and structural attribution of different colored opals" @default.
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- W4308554108 doi "https://doi.org/10.1039/d2ra04197a" @default.
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