Far infrared (THz) absorption spectra for the quantitative differentiation of calcium carbonate crystal structures: Exemplified in mixtures and in paper coatings

Bawuah, Prince; Kiss, Margit; Silfsten, P.; Tåg, Carl-Mikael; Gane, Patrick; Peiponen, Kai–Erik

doi:10.1007/s10043-014-0057-2

Cited by 3 publications

(9 citation statements)

References 16 publications

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“…Higher frequencies of the dolomite absorption peak and reflective index are likely related to the different space groups of calcite ( R 3̅ c ) and dolomite ( R 3̅), although calcite and dolomite belong to the same hexagonal crystal system . These results are consistent with previous studies of the far-infrared spectra using FTIR, which found a strong peak for calcite and a minor peak for aragonite at approximately the same frequency of 110 cm –1 (3.3 THz) and a strong peak for dolomite at a slightly different frequency of 160 cm –1 (4.8 THz). , Thus, mineralogy-specific absorbance and reflective indices for Ca–Mg carbonate minerals appear from 2.0 to 5.5 THz.…”

Section: Results and Discussionsupporting

confidence: 91%

“…21 These results are consistent with previous studies of the far-infrared spectra using FTIR, which found a strong peak for calcite and a minor peak for aragonite at approximately the same frequency of 110 cm –1 (3.3 THz) and a strong peak for dolomite at a slightly different frequency of 160 cm –1 (4.8 THz). 4,6 Thus, mineralogy-specific absorbance and reflective indices for Ca–Mg carbonate minerals appear from 2.0 to 5.5 THz.…”

Section: Results and Discussionmentioning

confidence: 99%

“…7 Carbonate minerals have been also used as the most common pigments and substrates for wall painting since ancient times. 6 Therefore, determining the original composition of the carbonate minerals is important for the conservation of art and cultural property. 8…”

Section: Introductionmentioning

confidence: 99%

“…Carbonate minerals have provided essential information in diverse fields of scientific, pharmaceutical, and industrial researches such as the Earth’s climate and history, oil and gas reservoir detection, , planetary systems, and identification of the origin of aeolian dust . In pharmaceuticals and industrials, differentiating and imaging different carbonate minerals are important for assuring sufficient quality of the active pharmaceutical ingredient for analyzing coatings and/or filler pigments and extenders in the paper making and printing industries, and for reinforcing rubber and plastic . Carbonate minerals have been also used as the most common pigments and substrates for wall painting since ancient times .…”

Section: Introductionmentioning

confidence: 99%

“…In pharmaceuticals and industrials, differentiating and imaging different carbonate minerals are important for assuring sufficient quality of the active pharmaceutical ingredient for analyzing coatings and/or filler pigments and extenders in the paper making and printing industries, and for reinforcing rubber and plastic . Carbonate minerals have been also used as the most common pigments and substrates for wall painting since ancient times . Therefore, determining the original composition of the carbonate minerals is important for the conservation of art and cultural property …”

Section: Introductionmentioning

confidence: 99%

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Pulsed Terahertz Radiation for Sensitive Quantification of Carbonate Minerals

et al. 2019

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Quantification of natural carbonate minerals, namely, aragonite, high- and low-Mg calcite, and dolomite provides essential information about biomineralization, carbon cycling on Earth, and the evolution of ocean chemistry, and is also useful in many other scientific, pharmaceutical, and industrial fields. However, X-ray diffractometer has previously been the only practical tool to identify and quantify carbonate minerals, including calcium carbonate (CaCO 3 ) polymorphs. We propose new fingerprint terahertz (THz) absorption and reflective index spectra in the 1–6 THz range that probe the lattice phonon modes and can be used for sensitive quantification of these four carbonate minerals, including polymorphs. In THz time-domain spectroscopy with our unique attenuated total reflection system, high- and low-Mg calcite and aragonite show different absorbance and reflective index amplitudes at 3.32 THz, which corresponds to the transverse optic mode. Dolomite shows a distinct absorbance peak and reflective index at 4.82 THz because its space group ( R 3̅) is different from that of calcite ( R 3̅ c ). THz absorbance and reflective index curves of the mixed carbonate materials, which typically occur in natural environments, correspond well to the curves calculated from the results of single-mineral samples ( R 2 > 0.98). Remarkably, the absorbance and reflective index can quantify small fractions (<1%) of low-Mg calcite in an aragonite matrix with high linearity ( R 2 = 0.99). Our findings provide a new method for screening low-Mg calcite diagenetic overprints on primary aragonitic skeletons such as corals, which is crucial for climate reconstructions using the isotopic analyses because a 1% overprint can cause estimated temperature deviations of ∼1 °C. THz spectra of carbonate minerals offer not only a new high-sensitivity quantification tool for interdisciplinary fields, but also safer light-source handling than X-ray diffractometer.

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Section: Results and Discussionsupporting

confidence: 91%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pulsed Terahertz Radiation for Sensitive Quantification of Carbonate Minerals

et al. 2019

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Effect of coating pigment type on paper printability with water-based inks

2022

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Tracking Amorphous Calcium Carbonate Crystallization Products with Far-Infrared Spectroscopy

Gao

Poduska

2023

Minerals

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We prepared solution-precipitated amorphous calcium carbonate by two similar methods and tracked structural changes over time as they crystallized. By cross-referencing mid-range infrared (400–4000 cm−1) with far-infrared (100–400 cm−1) spectral features, and by comparing with powder X-ray diffraction data for the aged crystallized products, we provide guidelines for—and potential limitations of—using far-infrared spectroscopy to assess multi-phase Mg-containing calcium carbonate samples that include amorphous or poorly crystallized components.

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Far infrared (THz) absorption spectra for the quantitative differentiation of calcium carbonate crystal structures: Exemplified in mixtures and in paper coatings

Cited by 3 publications

References 16 publications

Pulsed Terahertz Radiation for Sensitive Quantification of Carbonate Minerals

Pulsed Terahertz Radiation for Sensitive Quantification of Carbonate Minerals

Effect of coating pigment type on paper printability with water-based inks

Tracking Amorphous Calcium Carbonate Crystallization Products with Far-Infrared Spectroscopy

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