Role of Ti Content on the Occurrence of the 3309-cm–1 Peak in FTIR Absorption Spectra of Ruby Samples

Phlayrahan, Aumaparn; Monarumit, Natthapong; Satitkune, Somruedee; Wathanakul, P.

doi:10.1007/s10812-018-0662-0

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…The absorption at around 1630 cm -1 is due to C=O in carboxyl groups 28 . The peak at around 2345 cm -1 is attributed to the stretching of C-O bond 29,30 . Compared to the spectrum of NT sample, TAR-2 shows a widened absorption at around 3460 cm -1 , which was assigned to O-H stretching by Chen et al 28,31 to the hydrogen incorporation into the TiO2 nanotubes.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Hou

Jiang

2019

Applied Catalysis B: Environmental

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A two-anode reduction (TAR) technique is adopted to prepare, in one step without the existence of gaseous hydrogen, black TiO2 nanotubes co-doped with carbon and nitrogen. A sample prepared with the TAR technique for 2 min achieved the highest photocurrent response as 2.05 mA/cm 2 , which is 3 times as high as that of the pristine TiO2 nanotubes. A synergistic effect between black hydrogenation and C, N co-doping is observed. The light absorption in the whole ultraviolet-visible (UV-Vis) range is also greatly enhanced.

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Section: Catalyst Characterizationmentioning

confidence: 99%

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Hou

Jiang

2019

Applied Catalysis B: Environmental

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“…In gemology, FTIR spectra can also be applied to determine the molecular and/or structural vibration of-OH. This vibration is the result of reflections of OH-containing mineral inclusions such as boehmite, diaspore, goethite, and mica (Phlayrahan et al, 2018).…”

Section: Studies For the Determination Of Gemological Characteristicsmentioning

confidence: 99%

Gemological features of diaspore in sodra—Milas (mugla) region

Kinaci

Öztürk

2023

Front. Earth Sci.

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Diaspore, is related to bauxite in terms of its formation mechanism. Diaspore is one of the gemstone quality stones used in jewelry and jewelry making. It is possible to come across gemstones in various regions of the world. In our country, there are gemstone deposits in all regions. In these deposits, diaspore crystals are considered very valuable. Within the scope of this study, it was aimed to determine the gemological features of the diaspore formations in Sodra (Milas-Mugla) and its surroundings, as well as to determine other minerals and their formation conditions. Main oxide, trace, and rare earth element analyses were performed on seven collected samples. The classification was made using the Al2O3-SiO2-Fe2O3 triangular variation and it was determined that bauxite samples were in the “ferric bauxite” and “bauxite” areas. SEM imaging and EDS analyzes were performed on the samples and according to this result, it was determined that the samples mainly contained O, Al, and Si. The data obtained as a result of Raman Spectroscopy were matched with the device’s own data library and it was determined that the samples taken from the Sodra region were diaspore. In addition, according to the results of the FTIR analysis performed on the faceted sample taken from the Sodra region, it was seen that the samples were compatible with the reference standards and it was scientifically proven to be a diaspore crystal with gemstone quality. During the field studies carried out in the study area, diaspore crystals were encountered in the Milas-Sodra region, together with chloritoid and muscovite, within the metabauxite formations and in the altered zones close to the metabauxite limestone contact. Rock were classified as “muscovitequartzschist,” “quartzschist” with grano-lepidoblastic texture, “micaquartzschist” with lepidoblastic texture, “phyllite” with lepidoblastic texture, and “chlorite-epidote fels” with nematoblastic texture as a result of petrographic analyzes performed on the country rock samples. It is predicted that these gemstone-quality diaspore crystals can be evaluated economically.

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“…Phlayrahan et al [31] argued that the peak at 3309 cm −1 in the FTIR diagram is caused by the stretching vibration of Ti-OH, which is stronger in the c-axis direction, and the peaks near 3232, 3271 cm −1 are considered to be the absorption of the stretching vibration of Ti-OH in different crystallographic directions. According to the Beer-Lambert law A = εcd, the principle of quantitative analysis in infrared spectroscopy, the absorption peak near 3309 cm −1 corresponding to -OH in the sapphire ribbon can be analyzed by c = A/εd for quantitative comparison.…”

Section: Color Genesis Of Growth Bandsmentioning

confidence: 99%

Genesis of Color Zonation and Chemical Composition of Penglai Sapphire in Hainan Province, China

Wang

Liu

2022

Minerals

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The Penglai sapphires are mainly hosted in alkaline basalts and derived in alluvial sediments. Previous studies have investigated the formation of the Penglai sapphires; however, the genesis of color zoning remains ambiguous. In this paper, we report spectral and chemical composition data of sapphires using ultraviolet–visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy (FTIR), and laser-ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS). The results show that the Penglai sapphire has a magmatic origin, mostly showing various shapes of incomplete girdles, barrels, and flakes. The content of Ti in rims is higher than in cores of color-banded sapphire, which results from ubiquitous Ti-bearing inclusions within grown bands. The main chromophore of the deep-blue core is Fe2+-Ti4+, which pairs with Fe3+-Fe3+, Cr3+, and V3+ in the core, likely producing purple-hued blue in an oxidizing environment. The yellowish-brown rim is due to Fe3+ and Cr3+ in a reduced environment. Compared with the basaltic sapphires worldwide, the Fe content is moderately higher than those of most Asian sapphires but obviously lower than those of Changle sapphires in Shandong, China, and overlaps with those of African sapphires.

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Role of Ti Content on the Occurrence of the 3309-cm–1 Peak in FTIR Absorption Spectra of Ruby Samples

Cited by 11 publications

References 12 publications

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

A two-anode reduction technique to monitor the defect and dope the surface of TiO2 nanotube array as photo-anode for water splitting

Gemological features of diaspore in sodra—Milas (mugla) region

Genesis of Color Zonation and Chemical Composition of Penglai Sapphire in Hainan Province, China

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