Raman and Infrared Spectroscopic Tentative Identification of Organic Traces in Sadiya (LL5) Ordinary Chondrite

Saikia, Basanta; Parthasarathy, G.; Borah, Rashmi R.

doi:10.22606/adap.2018.34004

Cited by 4 publications

(3 citation statements)

References 37 publications

(43 reference statements)

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“…The distinctive peak doublets at 820–822 and 853–854 cm −1 are indicative of Mg‐rich olivine (forsterite) and are mainly due to coupling between the symmetric and asymmetric stretching modes of non‐bridging Si‐O bonds in SiO 4 tetrahedra of olivine (Lam et al, 1990; Pittarello et al, 2015; Saikia et al, 2009). However, the relative height and position of these Raman peaks depend upon the crystal orientation and the compositional ratio of olivine end members (e.g., Chopelas, 1991; Iishi, 1978; Saikia et al, 2016, 2017). The peak at 917.55 cm −1 in olivine indicates polymerization of SiO 4 tetrahedra and closely matches wadsleyite (a high‐pressure polymorph of Mg‐olivine) whose strongest Raman peak appears at 918 cm −1 (Acosta‐Maeda et al, 2013; McMillan & Akaogi, 1987; Ray et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…The olivine spectra are dominated by the SiO 4 tetrahedra internal stretching and bending modes (Voropaev et al, 2021). The distinctive peak doublets at 820-822 and 853-854 cm À1 are indicative of Mg-rich olivine (forsterite) and are mainly due to coupling between the symmetric and asymmetric stretching modes of non-bridging Si-O bonds in SiO 4 tetrahedra of olivine (Lam et al, 1990;Pittarello et al, 2015;Saikia et al, 2009). However, the relative height and position of these Raman peaks depend upon the crystal orientation and the compositional ratio of olivine end members (e.g., Chopelas, 1991;Iishi, 1978;Saikia et al, 2016Saikia et al, , 2017.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

et al. 2023

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The Mahadevpur (27°39′48″ N, 95°51′32″ E; Arunachal Pradesh, India) meteorite is a fall‐type, coarse‐grained rock consisting of a heterogeneous mixture of chondrules of varying types occurring in a matrix comprising mostly chondrule fragments. It was earlier classified as poorly shocked (S1, unshocked) ordinary chondrite (H4/5). The minerals observed in the Mahadevpur meteorite include olivine, orthopyroxene, clinopyroxene, albitic‐plagioclase, Fe‐Ni alloy and troilite with minor amounts of chromite and phosphate. Olivine and orthopyroxene are almost equilibrated. The textures and compositional features of minerals and chondrule margins indicate a limited degree of recrystallization. The equilibration temperature (700–800°C) for the Mahadevpur chondrite is consistent with the computed temperature (752–902°C) derived from the coexisting orthopyroxene‐clinopyroxene pairs. In the light of new evidences observed during the present study, such as olivine exhibiting undulose extinction and planar to sub‐planar fractures, olivine and orthopyroxene showing strong mosaicism, the shock‐melted plagioclase glasses, the presence of high‐pressure mineral phases and silicate darkening, the earlier proposed shock stage pronouncement has been modified to S4–S5 with supporting petrographic, sub‐microscopic and Raman spectroscopic data. This is the first comprehensive account of the Mahadevpur chondrite with an upgraded shock stage classification.

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Section: Resultsmentioning

confidence: 99%

Section: Raman Spectroscopymentioning

confidence: 99%

Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

et al. 2023

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“…In the FTIR spectrum of ZnO, the broad peak at around 3450 depicts O-H stretching vibrations, that could have been absorbed by the photocatalyst from the solvent (water). A sharp peak at 1620 cm -1 indicates carbonyl acetate group (-COO -), from zinc acetate, stretching frequency (Saikia et al, 2018). The band ranging from 800-500 cm -1 indicates Zn-O stretching vibrations (El-Kemary et al, 2010;Lavand and Malghe, 2016).…”

Section: Ftir Studiesmentioning

confidence: 99%

Fast and efficient photocatalytic degradation of Brilliant blue dye, under solar light irradiation, with bismuth doped ZnO.

Alamzeb,

Faryad,

Ullah

et al. 2023

Preprint

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Brilliant blue dye (BB) is being extensively used in textile and cosmetic industries. Recently BB has been reported to be carcinogenic and asthma causing agent. Hence, its use has been banned in several European countries. During the current study ZnO and Bi-ZnO were synthesized by using sol-gel method. The synthesized catalysts were characterized by x-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), energy dispersive x-ray spectroscopy (EDX), and Brunauer-Emmett-Teller surface area analysis (BET). Both ZnO and Bi-ZnO were used for the photocatalytic degradation of BB under solar light irradiation. Different parameters affecting the photocatalytic degradation of BB like contact time, dye concentration, catalyst concentration, and pH were evaluated and optimized. Both catalysts degraded BB efficiently but Bi-ZnO displayed better degradation potential (maximum 92 %) than ZnO (maximum 76 %). The band gap for ZnO and Bi-ZnO was found to be 3.10 and 2.95 eV, respectively. Surface area and pore size for ZnO and Bi-ZnO were determined to be 104.03 m /g and 199 nm, and 114.67 m /g and 203 nm, respectively. Kinetics analysis of the experimental data revealed that the photocatalytic degradation of BB followed pseudo-first-order kinetics (R = 0.9581). The value of first order rate constant (k ) was found to be 3.14 x 10 min . The results of the scavenging studies indicated that superoxide radicals ( O ) and hydroxyl radicals ( OH) produced by Bi-ZnO are mainly responsible for the degradation of BB. Finally, the current field challenges are presented, along with widely applied recommendations and detailed concluding remarks.

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High Shock Pressure Metamorphism Induced Transformations of Olivine and Feldspar in Natun Balijan L4 Chondrite: Evidence from Micro-Raman, Infrared Spectroscopy, X-ray Diffraction and Electron Microprobe Analysis

Saikia¹,

Parthasarathy

Rao

et al. 2022

Journal of the Geological Society of India

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For the first time, the presence of olivine-ringwoodite and plagioclase-maskelynite transformations is reported in Natun Balijan L4 chondrite determined by micro-Raman and infrared spectroscopic techniques with mineral phases characterised by electron microprobe analysis. Micro-Raman spectra reveal trace of ringwoodite, which is independently confirmed with the powder X-ray diffraction analysis. Full width at half maximum data of Raman spectrum reveals structural disordered olivine and pyroxene. The nature of infrared peaks at 639 and 724 cm–1 depicts the presence of maskelynite. Observed maskelynite Raman band at 509 and 581 cm–1 are used to estimate the shock stage of Natun Balijan L4 chondrite as at least S5. The impact metamorphism with a shock pressure of at least 40 GPa is estimated.

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Raman and Infrared Spectroscopic Tentative Identification of Organic Traces in Sadiya (LL5) Ordinary Chondrite

Cited by 4 publications

References 37 publications

Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

Petrography, mineral chemistry, metamorphism and Raman spectroscopic studies of Mahadevpur fall meteorite, India

Fast and efficient photocatalytic degradation of Brilliant blue dye, under solar light irradiation, with bismuth doped ZnO.

High Shock Pressure Metamorphism Induced Transformations of Olivine and Feldspar in Natun Balijan L4 Chondrite: Evidence from Micro-Raman, Infrared Spectroscopy, X-ray Diffraction and Electron Microprobe Analysis

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