Structural and Microstructural Correlations of Physical Properties in Natural Almandine-Pyrope Solid Solution: Al70Py29

Sibi, N; Subodh, G.

doi:10.1007/s11664-017-5801-5

Cited by 13 publications

(10 citation statements)

References 29 publications

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“…In addition, the mode at around 210 cm −1 (L) is due to translational motions of SiO4 (T(SiO4)) [29]. The mode at around 168 cm −1 (M) is due to the translation motion of Fe 2+ [30], which appears in the samples with the Alm content higher than 52 mol.% (Figure 9). [31] and Theodore (2013) [32].…”

Section: Characteristics Of Raman Spectroscopymentioning

confidence: 96%

Crystal-Chemical Properties of Synthetic Almandine-Pyrope Solid Solution by X-Ray Single-Crystal Diffraction and Raman Spectroscopy

Kuang

et al. 2019

Crystals

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Crystal-chemical properties of synthetic Almandine-Pyrope (Alm-Pyr) solid solutions were investigated by X-ray single-crystal diffraction and Raman spectroscopy. Garnet solid solution with different compositions were synthesized from powder at 4.0 GPa and annealed at 1200 °C for 48 h by a multi-anvil pressure apparatus. Garnet crystals with different sizes (about 60-1000 μm) were obtained from synthesis. The results of X-ray single-crystal diffraction show that the unit cell constants decrease with increasing Pyr contents in the synthetic Alm-Pyr crystals due to the smaller ionic radius of Mg2+ in eightfold coordination than that of Fe2+. The data exhibit obviously positive deviations from ideal mixing volumes across the Alm-Pyr join which may be caused by the distortion of the SiO4 tetrahedron. Moreover, the significant decrease in the average M-O bond length and volume of the [MgO8]/[FeO8] dodecahedron with increasing Pyr contents are the most important factors to the decrease in the Alm-Pyr crystal unit cell constant and volume. On the other hand, selected bond distances (average <M-O>, <Al-O>, and <D-O> distances) have a linear correlation with the unit-cell parameter, but the <Si-O> distance has nonlinear correlation. With increasing the unit-cell parameter, the average <M-O> distance increases significantly, followed by the average <D-O> and <Al-O> distances. While the <Si-O> distance changes negligibly further confirming the conclusion that the significant decrease of the average M-O bond length of the [MgO8]/[FeO8] dodecahedron with increasing Pyr contents are the most important factors to the decrease in the Alm-Pyr crystal unit cell volume. In the Raman spectra collected for the Alm-Pyr solid solutions, Raman vibration mode assignments indicate that the Raman vibrational spectra change along the Alm-Pyr binary solution. The mode frequencies of Si-O stretching, Si-O bending, and the rotation of the SiO4-tetrahedron (R(SiO4)) decrease linearly, while the translational modes of the SiO4-tetrahedron (T(SiO4)) increase with increasing Alm contents.

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Section: Characteristics Of Raman Spectroscopymentioning

confidence: 96%

Crystal-Chemical Properties of Synthetic Almandine-Pyrope Solid Solution by X-Ray Single-Crystal Diffraction and Raman Spectroscopy

Kuang

et al. 2019

Crystals

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“…By matching the spectra with the RUFF database (https://rruff.info/), the spectrum of G spot is similar to those of almandine (R050029) and spessartine (R060279), both of which are isomorphism with the space group of cubic Ia

\overset{3}{true}

d . The bands observed above 861 cm −1 in the Raman spectrum are assigned as the SiO stretching and the strongest one at around 906 cm −1 is precisely attributed to the symmetric stretching v 1 mode of SiO 4 tetrahedra (Kolesov & Geiger, 1998; Mingsheng et al, 1994; Sibi & Subodh, 2017). Raman bands in the 400–650 cm −1 region are prescribed to the v 2 and v 4 bending [SiO 4 ] tetrahedra internal vibrations modes (Makreski et al, 2005).…”

Section: Applications Of Rise Systemmentioning

confidence: 99%

Application of Raman imaging and scanning electron microscopy techniques for the advanced characterization of geological samples

Yuan

et al. 2022

Microscopy Res & Technique

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Raman is an important tool for diagnosing minerals in geoscience. However, smaller magnification of optical microscope assembled in conventional Raman spectroscopy limits the application of Raman in sub-micro and nano scale. Raman imaging and scanning electron microscopy (RISE) combine the advantage of scanning electron microscope and Raman spectroscopy, which can collect the morphology, composition, and structure information in the same micro region of the geological sample in situ. In this paper, we introduce the development and working mechanism of RISE, and carried out some typical applications in different research of geoscience. The purpose of this review is to allow readers to understand the basic principles and application potential of RISE in geoscience. Finally, we briefly point out current challenges faced by this technology and some research directions in the future. Highlights• Raman imaging and scanning electron microscopy as potential method was proposed for the research on geosciences.• Common polymorphism and isomorphism were distinguished clearly in situ.• A new research route for tiny inclusion and organic matter in situ was developed.

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“…Among the expected 25 Raman active modes (3A 1g + 8E g + 14T 2g ) of garnet group minerals [20], a total of 15 vibration modes were observed in the Raman spectra obtained that could be grouped into four main regions [22]. The two Raman bands at the range 120-280 cm −1 are assigned to translation modes, i.e., to the translation motion of Fe 2+ (band I) [47] and translation motions of SiO 4 (band II) [22,48]. At the range of 280-450 cm −1 , four Raman bands were observed (bands III-VI) dominated by rotation motions of SiO 4 [22].…”

Section: Garnetsmentioning

confidence: 99%

Raman Microspectroscopy of Garnets from S-Fibulae from the Archaeological Site Lajh (Slovenia)

2020

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Garnets (19 pieces) of Late Antique S-fibulae from the archaeological site at Lajh-Kranj (Slovenia) were analysed with Raman microspectroscopy to obtain their mineral characteristic, including inclusion assemblage. Most garnets were determined as almandines Type I of pyralspite solid solution series; however, three garnets showed a higher Mg, Mn and Ca contents and were determined as almandines Type II. Most significant Raman bands were determined in the range of 169–173 cm−1 (T(X2+)), 346–352 cm−1 (R(SiO4)), 557–559 cm−1 (ν2), 633–637 cm−1 (ν4), 917–919 cm−1 (ν1), and 1042–1045 cm−1 (ν3). Shifting of certain Raman bands toward higher frequencies was the result of an increase of the Mg content in the garnet composition, which also indicates the presence of pyrope end member in solid garnet solutions. Inclusions of apatite, quartz, mica, magnetite, ilmenite, as well as inclusions with pleochroic or radiation halo and tension fissures (zircon), were found in most of the garnets. Rutile and sillimanite were found only in garnets with the highest pyrope content. Spherical inclusions were also observed in two garnets, which may indicate the presence of melt or gas residues. The determined inclusion assemblage indicates the formation of garnets during medium- to high-grade metamorphism of amphibolite or granulite facies. According to earlier investigations of the garnets from Late Antique jewellery, the investigated garnets are believed to originate from India.

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Structural and Microstructural Correlations of Physical Properties in Natural Almandine-Pyrope Solid Solution: Al70Py29

Cited by 13 publications

References 29 publications

Crystal-Chemical Properties of Synthetic Almandine-Pyrope Solid Solution by X-Ray Single-Crystal Diffraction and Raman Spectroscopy

Crystal-Chemical Properties of Synthetic Almandine-Pyrope Solid Solution by X-Ray Single-Crystal Diffraction and Raman Spectroscopy

Application of Raman imaging and scanning electron microscopy techniques for the advanced characterization of geological samples

Raman Microspectroscopy of Garnets from S-Fibulae from the Archaeological Site Lajh (Slovenia)

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