Photoluminescence of synthetic titanite-group pigments: A rare quenching effect

Nasdala, Lutz; Lyubenova, T. Stoyanova; Gaft, M.; Wildner, Manfred; Diegor, Wilfredo; Petautschnig, Christian; Talla, Dominik; Lenz, Christoph

doi:10.1016/j.chemer.2014.04.004

Cited by 6 publications

(7 citation statements)

References 25 publications

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“…Note, however, that luminescence imaging or mapping is of semiquantitative character as the intensity of PL emissions may strongly depend on further variables such as quenching (described for titanite e.g., in Nasdala et al, 2014), sensitizing by other elements (e.g., Marfunin, 1979;Kempe and Götze, 2002) and effects of crystal orientation (e.g., Lenz et al, 2013; and references therein). Luminescence intensities of REE 3+ may also be affected by radiation damage as caused by radioactive decay of U and Th; especially in samples with high U and Th concentrations and elevated geologic ages (e.g., Seydoux-Guillaume et al, 2002;Panczer et al, 2012;Lenz and Nasdala, 2015).…”

Section: Discussionmentioning

confidence: 98%

“…As a result, PL spectra of this sample are dominated by the PL of Cr 3+ only, whereas titanite samples that contain elevated amounts of REEs are dominated by emissions of REE 3+ (e.g., samples Tit-C and Tit-D, Table 1), or both the emissions of Cr 3+ and REE 3+ (sample Tit-E; spectra not shown). Note, however, that very high Cr contents may potentially quench emissions of the REE 3+ , which has been observed for synthetic, Cr-doped titanite pigments (Nasdala et al, 2014). Fig.…”

Section: Titanite -Catisiomentioning

confidence: 92%

“…Note, however, that luminescence imaging or mapping is of semiquantitative nature as luminescence intensity may strongly depend on further variables, such as quenching (Kempe and Götze, 2002;Nasdala et al, 2014) and sensitizing by other elements (e.g., Marfunin, 1979), effects of crystal orientation (e.g., Lenz et al, 2013) and the structural state/crystallinity, e.g., the accumulation of radiation damage due to the incorporation of radioactive U and Th (e.g., Lenz and Nasdala, 2015 and references therein). A potential (semi-) quantitative estimation of REE trace elements via luminescence intensity needs a broad range of carefully calibrated analytical conditions, e.g., standard material, system stability, and system response (Barbarand and Pagel, 2001;Habermann, 2002;Richter et al, 2003;Edwards et al, 2007;MacRae et al, 2012MacRae et al, , 2013.…”

Section: Zirconmentioning

confidence: 99%

“…The crystals along with the remainders of flux could then be extracted from the crucibles with moderate mechanical effort. More details on the titanite syntheses are reported elsewhere (Nasdala et al, 2014).…”

Section: Details On Sample Synthesismentioning

confidence: 99%

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Laser-induced REE3+ photoluminescence of selected accessory minerals — An “advantageous artefact” in Raman spectroscopy

et al. 2015

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Keywords:Zircon Xenotime Monazite Titanite Laser-induced REE photoluminescence Raman artefact Laser-induced photoluminescence of trivalent rare-earth elements (REEs), which is obtained as analytical artefacts in Raman spectra of selected accessory minerals, was studied. Spectra of natural titanite, monazite-(Ce), xenotime-(Y), and zircon samples from various geological environments were compared with emission spectra of synthetic, flux-grown analogues doped with REEs. The latter is of great importance to identify potentially mistakable bands as either Raman or PL signal, and to assign them to certain REE centres. In the samples investigated, various REE centres are excited selectively using 473, 514, 532, 633, and 785 nm laser excitation. Their assignment was verified by photoluminescence-excitation experiments. Luminescence spectral patterns of zircon and titanite vary in dependence of trace-REE concentrations, hence reflecting geochemical growth conditions. "REE artefacts" in Raman spectra of accessory minerals may be used as fingerprint tool for mineral phaseidentification. The distribution of REE emission-intensities, revealed by hyperspectral mapping, opens up the opportunity to visualise mineral textures, complementary to cathodoluminescence imaging-techniques.

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Section: Discussionmentioning

confidence: 98%

Section: Titanite -Catisiomentioning

confidence: 92%

Section: Zirconmentioning

confidence: 99%

Section: Details On Sample Synthesismentioning

confidence: 99%

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Laser-induced REE3+ photoluminescence of selected accessory minerals — An “advantageous artefact” in Raman spectroscopy

et al. 2015

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“…It is known that the optical properties of titanite powders change during grinding [1]. In this case, the specific surface increases 30−50 times and its reactivity also increases [1][2][3][4][5][6][7][8][9]. Recently, titanite has attracted attention as biomedical material because of its high chemical stability [5].…”

Section: Introductionmentioning

confidence: 99%

Х-ray Study and Computer Simulation of the Structure of Amorphous-Crystalline Titanite

Сидорова

Алешина

Fofanov

2022

Физика Твердого Тела

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The structure of amorphous-crystalline titanite obtained by mechanical activation was studied by X-ray diffraction and simulation methods. The short-range order characteristics were calculated using Finbak-Warren's method. It was found that the coordination numbers of metal atoms decreased as the result of titanite grinding. The atomic configurations of short-range order of ground titanite were constructed by translation of titanite unit cell. The theoretical X-ray patterns were calculated using Debye's method and were compared with the experimental curves. The structure of ground titanite in the mill with centrifugal factor 40 g was described satisfactorily by the model of mechanical mixture of clusters containing 2016 atoms, disordered during the molecular dynamics with clusters containing 12096 atoms. The increase of grinding intensity led to the sharp decrease of sizes of small cluster.

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Photocatalytic degradation of methylene blue dye using poly(3‐hydroxybutyrate)/poly(ethylene glycol)/titanite films and membranes

Domínguez-Díaz¹,

Cortés-Hernández²,

O-Baquera³

et al. 2021

J of Applied Polymer Sci

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In this work, novel poly(3‐hydroxybutyrate) (PHB)/poly(ethylene glycol) (PEG)/titanite (CaTiSiO5) composites in the form of films and membranes are used for the photocatalytic degradation of methylene blue (MB) in aqueous solution. Films and membranes are prepared from PHB and PEG with either 80 or 93 mol% of titanite. For comparison purposes, titanite powder, films, and membranes of PHB and PEG with no titanite added, are also analyzed. To study the behavior of the materials, X‐ray diffraction, luminescence, field emission scanning electron microscopy, and Raman spectroscopy, are used. Additionally, contact angle was measured by the sessile drop technique. Materials are placed in a beaker containing the MB aqueous solution under constant stirring and exposed to UV light for 12 h. With respect to the initial concentration (C0), the relative MB concentration (C/C0) is measured every hour employing UV–visible spectroscopy. The obtained results showed that by using 0.010 g of titanite powder, approximately 30% of the MB is degraded after 12 h of UV irradiation. The highest MB degradation is obtained with 0.320 g of the polymer/ceramic membrane (0.310 g of polymers and 0.010 g of titanite), where approximately 90% of MB is degraded.

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Photoluminescence of synthetic titanite-group pigments: A rare quenching effect

Cited by 6 publications

References 25 publications

Laser-induced REE3+ photoluminescence of selected accessory minerals — An “advantageous artefact” in Raman spectroscopy

Laser-induced REE3+ photoluminescence of selected accessory minerals — An “advantageous artefact” in Raman spectroscopy

Х-ray Study and Computer Simulation of the Structure of Amorphous-Crystalline Titanite

Photocatalytic degradation of methylene blue dye using poly(3‐hydroxybutyrate)/poly(ethylene glycol)/titanite films and membranes

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