raman spectroscopy of anhydrous and hydrated calcium

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  • Raman and infrared spectroscopic study of the anhydrous

    ;· Frost, Ray & Dickfos, Marilla (2008) Raman and infrared spectroscopic study of the anhydrous carbonate minerals shortite and barytocalcite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 71(1), pp. 143-146.

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  • A hydrated crystalline calcium carbonate phase: Calcium

    ;· Calcium carbonate (CaCO3) forms important minerals on Earth and is a model system for understanding crystal nucleation. Three different structures of CaCO3 are known, along with two structures that are hydrated. Zou et al. found a third hydrated

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  • Hydration of calcium aluminates and calcium sulfoaluminate

    Spectra of anhydrous pure samples and pastes hydrated for 48 h were recorded. In order to contrast the Raman analysis results, the samples were also characterized by XRD and FTIR techniques. Hydration of calcium aluminates led to the formation of C3AH 6, C2AH8 and aluminum hydroxide, and hydration of ferrite phases led to hydrogarnet phases.

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  • Transformation and crystallization energetics of synthetic

    Transformation and crystallization energetics of synthetic and biogenic amorphous calcium carbonate A. V. Radhaa, Tori Z. Forbesa, Christopher E. Killianb, P. U. P. A. Gilbertb,2, and Alexandra Navrotskya,1 aPeter A. Rock Thermochemistry Laboratory and Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit (NEAT ORU),

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  • Characterization of the Calcium Silicate and Aluminate

    Abstract. 27 Al and 29 Si magic-angle spinning (MAS) NMR spectroscopies have proven to be valuable tools for characterization and quantitative analysis of the anhydrous and hydrated calcium silicate and aluminate phases in Portland cements. This paper describes the results obtained in the authors laboratory from the 27 Al and 29 Si MAS NMR studies of Portland cements during the past few years.

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  • Raman Data and Analysis Raman Bands Horiba

    ;· Raman Bands RAMAN DATA AND ANALYSIS Raman Spectroscopy for Analysis and Monitoring The Raman scattering technique is a vibrational molecular spectroscopy which derives from an inelastic light scattering process. With Raman spectroscopy, a laser photon is scattered by a sample molecule and loses ( or gains) energy during the process.

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  • Structural insights into anhydrous and monohydrated forms

    ;· Furthermore, Raman spectra characterized such differences of vibrational modes shown within 200–1800 cm −1 region about the monohydrated and anhydrous forms of PCA.

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  • 1 Identification of anhydrous CaCl2 and KCaCl3 in natural

    ;· 1 1 Identification of anhydrous CaCl 2 and KCaCl 3 in natural inclusions by 2 Raman spectroscopy 3 GRISHINA Svetlana1, KOD RA Peter2, URIARTE Lucas M.3, DUBESSY Jean3, 4 ORESHONKOV Aleksandr4,5,,GORYAINOV Sergey1, ŠIMKO František6, YAKOVLEV Igor1. 5 ROGINSKII Evgenii M.7 6 1: Sobolev Institute of Geology and Mineralogy Siberian Branch of the

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  • A hydrated crystalline calcium carbonate phase: Calcium

    Calcium carbonate is often referenced as a model system for study-ing nucleation and crystallization mechanisms fromionsolutions(7,8). For more than a century, three anhydrous crystalline polymorphs of CaCO 3 were known to exist at ambient conditions— calcite, aragonite, and vaterite—as well as two hydrated crystalline phases, monohydrocalcite

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  • Hydration of calcium aluminates and calcium sulfoaluminate

    ;· Spectra of anhydrous pure samples and pastes hydrated for 48 h were recorded. In order to contrast the Raman analysis results, the samples were also characterized by XRD and FTIR techniques. Hydration of calcium aluminates led to the formation of C 3 AH 6, C 2 AH 8 and aluminum hydroxide, and hydration of ferrite phases led to hydrogarnet phases.

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  • Reference Raman spectra of synthesized CaCl2 · nH2O solids

    Raman spectra of CaCl2 · nH2O (n = 0, 2, 4, 6) solids unambiguously identified by X‐ray diffraction (XRD) are given in the spectral range 100–4000 cm−1 at room temperature and −172 °C. Band assignmen...

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  • Raman Spectroscopy of Anhydrous and Hydrated Calcium

    ;· The usefulness of this technique for the identification of anhydrous, hydrated, and carbonated phases in cement-based materials has been demonstrated. In the present work, the application of micro-Raman spectroscopy for the characterization of the main clinker phases of calcium aluminate cements and calcium sulfoaluminate cement is explored.

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  • Portable Raman Spectroscopy for the Study of

    ;· Here we show some examples of the value of Raman spectroscopy to monitor and identify different polymorphs. We used the portable i–Raman Plus with BWSP-21pt11 software for continuous monitoring and trending of the monohydrate to anhydrous transition of citric acid, with spectra collected every 15 seconds as the temperature was increased.

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  • RAMAN, MIR, AND NIR SPECTROSCOPIC STUDY OF

    ;· Introduction: Gypsum (CaSO4.2H2O) and bassanite (CaSO4.0.5H2O) were identified on Mars by OMEGA on Mars Express and CRISM on MRO [1, 2, 3]. An-hydrite (CaSO4) is non-active in the spectral range of OMEGA and CRISM, but may also exist. Ca-sulfate was inferred from compositional correlations revealed by APXS on Mars Exploration Rovers [5, 6, 7], but no definitive identification, as well as its hydra-tion state, was made because of the lack of an in situ mineral identification tool (e.g. Raman or XRD). Compared to Mg-sulfates and Fe-sulfates, Ca-sulfates are more stable under Mars conditions and contain a limited range of H2O content, 2w, 0.5w, 0w per SO4, thus they may not play an important role in the water cycle on Mars. However when Ca-sulfates were mixed with others, e.g. Mg-sulfates, Ca-sulfates can affect the hydration

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  • A hydrated crystalline calcium carbonate phase: Calcium

    Calcium carbonate is often referenced as a model system for study-ing nucleation and crystallization mechanisms fromionsolutions(7,8). For more than a century, three anhydrous crystalline polymorphs of CaCO 3 were known to exist at ambient conditions— calcite, aragonite, and vaterite—as well as two hydrated crystalline phases, monohydrocalcite

    MORE
  • FT-Raman and high-pressure infrared spectroscopic studies

    The FT-Raman spectra and the pressure dependence of the infrared spectra of the hydrated and anhydrous forms of dicalcium phosphate, CaHPO 4 · 2H 2 O and CaHPO 4,have been studied. The hydrated salt exhibits a phase transition at 21 kbar (1.0 kbar=0.1 Gpa) but no high pressure transition was observed for anhydrous dicalcium phosphate.

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  • Calcite Raman spectrum Romanian Database of Raman

    ;· Interpretation of Raman spectrum of Calcite. The intense band (ν 1) of calcite spectrum corresponds to the symmetric stretching of CO 3 group at 1092 cm-1.The ν 2 (asymmetric deformation) vibration mode is not active in Raman. The values attributed to ν 3 (asymmetric stretching) mode are 1437 cm-1 and ν 4 (symmetric deformation) mode at 715 cm-1.Symmetric deformation or symmetric

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  • Vibrational spectra of the hydrated carbonate minerals

    The Raman (200-4000 cm(-1)) and infrared (600-4000 cm(-1)) spectra of four rare carbonate hydrate minerals are reported. These are naturally occurring and synthetic ikaite CaCO3.6H2O, and nesquehonite MgCO3.3H2O; natural monohydrocalcite CaCO3.H2O, and synthetic lansfordite MgCO3.5H2O. The spectra o

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  • DIGITAL.CSIC: Hydration of calcium aluminates and calcium

    ;· Spectra of anhydrous pure samples and pastes hydrated for 48 h were recorded. In order to contrast the Raman analysis results, the samples were also characterized by XRD and FTIR techniques. Hydration of calcium aluminates led to the formation of C3AH 6, C2AH8 and aluminum hydroxide, and hydration of ferrite phases led to hydrogarnet phases.

    MORE
  • Vibrational spectra of the hydrated carbonate minerals

    The Raman (200-4000 cm(-1)) and infrared (600-4000 cm(-1)) spectra of four rare carbonate hydrate minerals are reported. These are naturally occurring and synthetic ikaite CaCO3.6H2O, and nesquehonite MgCO3.3H2O; natural monohydrocalcite CaCO3.H2O, and synthetic lansfordite MgCO3.5H2O. The spectra o

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  • A hydrated crystalline calcium carbonate phase: Calcium

    ;· Calcium carbonate (CaCO3) forms important minerals on Earth and is a model system for understanding crystal nucleation. Three different structures of CaCO3 are known, along with two structures that are hydrated. Zou et al. found a third hydrated

    MORE
  • Fourier transform Raman spectroscopy of synthetic and

    Fourier-transform (FT) Raman spectroscopy was used to characterize the organic and mineral components of biological and synthetic calcium phosphate minerals. Raman spectroscopy provides information on biological minerals that is complimentary to more widely used infrared methodologies as some infrared-inactive vibrational modes are Raman-active.

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  • Raman Spectroscopy of Anhydrous and Hydrated Calcium

    ;· The usefulness of this technique for the identification of anhydrous, hydrated, and carbonated phases in cement-based materials has been demonstrated. In the present work, the application of micro-Raman spectroscopy for the characterization of the main clinker phases of calcium aluminate cements and calcium sulfoaluminate cement is explored.

    MORE
  • Calcium sulfate anhydrous Raman Spectrum SpectraBase

    ;· Calcium sulfate anhydrous View entire compound with free spectra: 3 FTIR, and 2 Raman. SpectraBase Compound ID: HtMwzfu1mwk: Exact Mass: 135.914321 g/mol: Raman Spectrum. View the Full Spectrum for FREE! View the Full Spectrum for FREE! The full spectrum can only be viewed using a FREE account. SpectraBase Spectrum ID: ChqtjXNrKQM: Name

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  • Characterization of anhydrous and hydrated pharmaceutical

    ;· The anhydrous forms of pharmaceutical substances including caffeine, theophylline, D ‐glucose, and ampicillin exhibit different THz absorption spectra from their hydrated forms, presumably due to their different intermolecular vibrational modes mediated by hydrogen‐bonding. The data from X‐ray powder diffractometry (XRPD) confirm the

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  • (PDF) A PRELIMINARY RAMAN AND FT-IR SPECTROSCOPIC

    IntroductionRaman spectroscopy is regarded as a powerful technique for the characterization of minerals due to its intrinsic features: (i) requires little or no sample preparation; (ii) is highly specific like the chemical fingerprint of a material; (iii) Raman spectra are acquired quickly within seconds; (iv) Raman spectra can be collected from a very small volume (< 1 m in diameter); (vi

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  • FT-Raman and high-pressure infrared spectroscopic studies

    1999-12-1 · The FT-Raman spectra and the pressure dependence of the infrared spectra of the hydrated and anhydrous forms of dicalcium phosphate, CaHPO 4 · 2H 2 O and CaHPO 4, have been studied.The hydrated salt exhibits a phase transition at 21 kbar (1.0 kbar=0.1 Gpa) but no high pressure transition was observed for anhydrous dicalcium phosphate.

    MORE
  • Raman Spectroscopy of Anhydrous and Hydrated Calcium

    The usefulness of this technique for the identification of anhydrous, hydrated, and carbonated phases in cement-based materials has been demonstrated. In the present work, the application of...

    MORE
  • Raman spectroscopy of anhydrous and hydrated calcium

    ;· Torréns-Martín, D., L. Fernández-Carrasco, S. Martínez-Ramírez, J. Ibáñez, L. Artús, and T. Matschei (2013), Raman spectroscopy of anhydrous and hydrated

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  • Raman and infrared spectroscopic study of the anhydrous

    ;· Frost, Ray & Dickfos, Marilla (2008) Raman and infrared spectroscopic study of the anhydrous carbonate minerals shortite and barytocalcite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 71(1), pp. 143-146.

    MORE
  • A hydrated crystalline calcium carbonate phase: Calcium

    ;· Calcium carbonate (CaCO3) forms important minerals on Earth and is a model system for understanding crystal nucleation. Three different structures of CaCO3 are known, along with two structures that are hydrated. Zou et al. found a third hydrated

    MORE
  • Raman Spectroscopy of Anhydrous and Hydrated Calcium

    ;· Journal Raman Spectroscopy of Anhydrous and Hydrated Calcium Aluminates and Sulfoaluminates David Torr ens-Mart ın,‡,† Lucia Fern andez-Carrasco,‡ Sagrario Mart ınez-Ram ırez,§ Jordi Ib an~ez,¶ Lluis Art us, and Thomas Matscheik ¶

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  • Hydration of calcium aluminates and calcium sulfoaluminate

    Raman spectroscopy has been used to follow the hydration of the main calcium aluminate phases present in calcium aluminate cement (CAC) and calcium sulfoaluminate cement (CSA) clinkers, i.e. C 3 A, CA, C 12 A 7, CA 2, C 4 AF and C 4 A 3 S ¯.We investigate the reaction products induced by hydration on these six compounds.

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  • CALCIUM HYPOCHLORITE, HYDRATED Raman Spectrum

    Raman Spectrum. View the Full Spectrum for FREE! View the Full Spectrum for FREE! The full spectrum can only be viewed using a FREE account. SpectraBase Spectrum ID: CUdhAPFq2G6: Name: CALCIUM HYPOCHLORITE, HYDRATED: Source of Sample: The Matheson Company, Inc., Cincinnati, Ohio: Chemical Description: CALCIUM HYPOCHLORITE, HYDRATED:

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  • Oxygen Spectroscopy and Polarization-Dependent Imaging

    ;· X-ray absorption near-edge structure (XANES) spectroscopy and spectromicroscopy have been extensively used to characterize biominerals. Using either Ca or C spectra, unique information has been obtained regarding amorphous biominerals and nanocrystal orientations. Building on these results, we demonstrate that recording XANES spectra of calcium carbonate at the oxygen K-edge enables

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  • Electrochemical Intercalation of Mg 2+ into Anhydrous and

    The reversible intercalation of multivalent cations, especially Mg 2+,into a solid-state electrode is an attractive mechanism for next-generation energy storage devices. These reactions typically exhibit poor kinetics due to a high activation energy for interfacial charge-transfer and slo

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  • Raman Spectroscopy of Anhydrous and Hydrated Calcium

    The usefulness of this technique for the identification of anhydrous, hydrated, and carbonated phases in cement-based materials has been demonstrated. In the present work, the application of micro-Raman spectroscopy for the characterization of the main clinker phases of calcium aluminate cements and calcium sulfoaluminate cement is explored.

    MORE
  • Calcite Raman spectrum Romanian Database of Raman

    ;· Interpretation of Raman spectrum of Calcite. The intense band (ν 1) of calcite spectrum corresponds to the symmetric stretching of CO 3 group at 1092 cm-1.The ν 2 (asymmetric deformation) vibration mode is not active in Raman. The values attributed to ν 3 (asymmetric stretching) mode are 1437 cm-1 and ν 4 (symmetric deformation) mode at 715 cm-1.Symmetric deformation or symmetric

    MORE
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