Raman spectra of carbonates of calcite structure

Rutt, H.N.; Nicola, Jorge Humberto

doi:10.1088/0022-3719/7/24/015

Cited by 186 publications

(121 citation statements)

References 12 publications

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“…Spectra were compared to the gypsum, calcite and aragonite standards in the Raman mineralogical database RRUFF, (http://rruff.info/) and to our own spectral databases. The Raman vibration bands match those identified in previous work on gypsum (Berenblut et al, 1971), calcite (Rutt & Nicola, 1974) and aragonite (Frech et al, 1980).…”

Section: Raman Spectroscopysupporting

confidence: 85%

Gypsum-carbonate speleothems from Cueva de las Espadas (Naica mine, Mexico): mineralogy and palaeohydrogeological implications

Gázquez¹,

Calaforra²,

Forti³

et al. 2012

IJS

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Some of the most outstanding hypogenic gypsum speleothems worldwide have been recently discovered in the Naica mines. The Cueva de las Espadas (Swords Cave), which lies at 120 m depth, hosts a rare type of speleothem called "espada" ("sword"). This study contributes to the understanding of the mineralogical composition of these singular speleothems, by means of their examination using micro-Raman spectroscopy, FT-IR spectroscopy and EDX microprobe. Our data revealed a complex mineralogy comprising a high-purity selenite core covered by several layers of calcite, aragonite and gypsum. Solid inclusions of polymetallic oxides (Mn-Pb-Zn) and graphite were also detected. The position of the water table during the genesis of the "espada" speleothems (over the past 60 kyr) was deduced from their mineralogy. Water level fluctuations at around -120 m depth led to environmental changes within the Cueva de las Espadas. The selenite core and gypsum layers were precipitated under biphasic (water-rock) conditions when the cave was submerged under hydrothermal water. The aragonite precipitation required triphasic (air-water-rock) conditions and occurred when the water table intercepted the cave, allowing the CO 2 exchange necessary for carbonate precipitation. Solid inclusions were trapped in an aerobic environment when the gypsum-aragonite boundary condition occurred. A thin calcite layer was precipitated under vadose conditions after the water table definitively moved out of the cave.

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Section: Raman Spectroscopysupporting

confidence: 85%

Gypsum-carbonate speleothems from Cueva de las Espadas (Naica mine, Mexico): mineralogy and palaeohydrogeological implications

Gázquez¹,

Calaforra²,

Forti³

et al. 2012

IJS

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“…The pristine spectrum has five fundamental bands located at ∼152, 280, 713, 1085 and 1485 cm −1 along with extra bands located at 1118, 1203, 1291, 1382, 1542, 1659, 1759 and 1841 cm −1 . These fundamental bands are in good agreement with those reported in the literature [13][14][15][16]. From factor group analysis of calcite, internal A 1g mode (υ 1 , symmetric stretch) of the carbonate anion located at ∼1085 cm −1 is the strongest feature.…”

Section: Resultssupporting

confidence: 90%

Swift heavy ion irradiation induced phase transformation in calcite single crystals

Nagabhushana

Lakshminarasappa

et al. 2009

Solid State Communications

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a b s t r a c tIon irradiation induced phase transformation in calcite single crystals have been studied by means of Raman and infrared spectroscopy using 120 MeV Au 9+ ions. The observed bands have been assigned according to group theory analysis. For higher fluence of 5 × 10 12 ion/cm 2 , an extra peak on either side of the 713 cm −1 peak and an increase in the intensity of 1085 cm −1 peak were observed in Raman studies. FTIR spectra exhibit extra absorption bands at 674, 1589 cm −1 and enhancement in bands at 2340 and 2374 cm −1 was observed. This might be due to the phase transformation from calcite to vaterite. The damage cross section (σ ) for all the Raman and FTIR active modes was determined. The increase of FWHM, shift in peak positions and appearance of new peaks indicated that calcite phase is converted into vaterite.

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“…The Raman spectrum of CaCO 3 is sharp for hopper crystals prepared at R = 16.0 than that of tabular CaCO 3 particles at R = 7.2, which is primarily due to different crystal structures. Five normal modes for calcite are observed in the hopper crystal CaCO 3 , with the most intense A 1 g mode at 1086 cm -1 , the rest vibration frequencies at 155, 281, 712 and 1435 cm -1 are associated with the Eg modes, their frequencies are well consistent with those reported by Rutt and Nicola (1974). The tabular CaCO 3 particles show only two weak over-lapped bands at 1084 and 1092 cm -1 because of the low crystallinity of the particles.…”

Section: Resultssupporting

confidence: 87%

Synthesis of Calcium Carbonate Particles in Octylamine/Water Bilayer Systems

Wang

White

Adair

2014

KONA

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Calcium carbonate particles with various shapes and morphologies were prepared via precipitation in an octylamine/water self-assembly bilayer systems. Crystal structure and shape of the CaCO 3 particles were determined by the water to octylamine molar ratio R of the bilayer. At R = 16.0, phase pure calcite particles with a "hopper crystal" morphology were formed, the average particle size of the hopper crystal is 10 μm with welldefined edges on the hopper faces. Decrease the R ratio to 7.2 eventually leads to the formation of 3 μm tabular CaCO 3 particles which are predominated by vaterite structure. For an intermediate R of 10.8, spherical vaterite aggregates and rhombohedral calcite particles were produced. Thermal decomposition of the CaCO 3 particles was observed at around 710°C. The mechanism of particle evolution in the self-assembly bilayer, particularly the formation of "hopper crystal" calcite was discussed.

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Raman spectra of carbonates of calcite structure

Cited by 186 publications

References 12 publications

Gypsum-carbonate speleothems from Cueva de las Espadas (Naica mine, Mexico): mineralogy and palaeohydrogeological implications

Gypsum-carbonate speleothems from Cueva de las Espadas (Naica mine, Mexico): mineralogy and palaeohydrogeological implications

Swift heavy ion irradiation induced phase transformation in calcite single crystals

Synthesis of Calcium Carbonate Particles in Octylamine/Water Bilayer Systems

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