High Pressure Raman Spectroscopy of Nitric Acid

Lucas, Hervé; Petitet, J. P.

doi:10.1021/jp9910486

Cited by 22 publications

(22 citation statements)

References 19 publications

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“…In addition, a peak at 710 cm -1 assigned to the d 4 bending mode of the NO 3 -group is also present, whereas no peak corresponding to the m stretching mode of the O 0 -NO 2 group is observed in either spectra. The O 0 -NO 2 stretching mode generates a strong peak in the Raman spectrum of HNO 3 , and this vibration is known to possess high Raman activity [17,18]. Ratcliffe et al [17] obtained Raman spectra of aqueous HNO 3 from 276 to 523 K and reported that the spectra exhibited both the m 1 NO 3 -vibrational stretching mode and the m O 0 -NO 2 stretching mode at 276 K. As the temperature was raised to 523 K, the intensity of the m O 0 -NO 2 stretching mode increased and intensity of the m 1 NO 3 -vibrational stretching mode decreased.…”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition of molten ammonium nitrate (AN)

Izato

Miyake

2015

J Therm Anal Calorim

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Raman spectra of ammonium nitrate (AN) above its melting point of 443 K and decomposition temperature of 533 K were acquired, and the thermal properties of AN were assessed using differential scanning calorimetry (DSC) so as to obtain a better understanding of the condensed phase decomposition. The Raman spectra of molten AN at both 443 and 533 K exhibited a strong peak at 1043 cm -1 , assigned to the m 1 vibrational stretching mode of the NO 3 -group, and a 710 cm -1 peak attributed to the d 4 bending mode of the NO 3 -group, whereas no peak was observed at approximately 940 cm -1 due to the O 0 -NO 2 stretching mode of HNO 3 . Chemical equilibrium calculations based on the reaction NO 3 -? NH 4 ? HNO 3 ? NH 3 demonstrated that the concentration of HNO 3 gradually increases with temperature, although the HNO 3 to NO 3 -ratio was still only approximately 0.0034, even at 533 K. Thus, molten AN was found to contain primarily NO 3 -and only a minor amount of liquid HNO 3 over the temperature range analyzed. The heat flow associated with condensed phase decomposition was simulated based on the assumption that the decomposition rate of AN is given by ÀdC AN =dt ¼ 10 9:4 exp À125520=RT ð Þ C NH þ 4 C HNO 3 and that C NH þ 4 and C HNO 3 are constant due to chemical equilibrium. The heat flow curves thus calculated were in good agreement with the experimental DSC data acquired at 5.1 MPa.

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Section: Resultsmentioning

confidence: 99%

Thermal decomposition of molten ammonium nitrate (AN)

Izato

Miyake

2015

J Therm Anal Calorim

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“…In order to assign the bands observed in the Raman spectra of the precursor solutions, we also studied the Raman spectra of pure 2-methoxyethanol, acetic acid and 20% aqueous solution of nitric acid. The observed Raman spectra were compared with those previously published [55][56][57]. Based on the relevant published data, we have assigned the Raman bands observed in the solvent spectra, which are summarized in Table 1.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

et al. 2011

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A novel and general chemical solution route for processing high-quality transition metal and rare-earth orthorhombic manganite thin films on Pt(111)/Ti/SiO 2 /Si substrates was reported. The precursor solutions decomposition process of the manganites was studied by TG and DTA techniques, showing the formation of the phase above 650°C in LaMnO 3 and 750°C in both EuMnO 3 and DyMnO 3 thin films. X-ray diffraction and Raman spectroscopic analysis reveal the formation of a pure orthorhombic structure, with a space group Pbnm, in LaMnO 3 , EuMnO 3 and DyMnO 3 thin films annealed at temperatures above the TG phase formation temperature observed. Microstructure and grain morphology of the films were analyzed by SEM and AFM techniques, showing a progressive improvement of the films structures with the increase of the annealing temperature. The temperature dependence of the magnetic response of the LaMnO 3 , EuMnO 3 and DyMnO 3 thin films show typical transition temperatures, compared with those reported for lanthanum, europium and dysprosium manganite single crystals and ceramics.

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“…14 Crystallisation was observed to occur at 1.4 GPa and on further compression a marked change, from -1c m -1 GPa -1 to -4.5 cm -1 GPa -1 , was observed at 10 GPa in the pressure derivative (dv/dp) of the nitro group elongation mode vs (NO 2 f r e q u e n c yw i t hp r e s s u r e ,w i t hadv/dp of 4.5 cm -1 GPa -1 ,o v e r the 0-30 GPa interval, indicating a progressive strengthening of the hydrogen bonds between neighbouring molecules. Ionisation of the molecules above 30 GPa, with the formation of the NO 3 -H + salt, was suggested due to the apparent absence of all other bands apart from the vs(NO 3 -) of the nitrate ion.…”

Section: Introductionmentioning

confidence: 99%

The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid

et al. 2010

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This version is available at https://strathprints.strath.ac.uk/26164/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. A new high-pressure phase of pure nitric acid (HNO 3 ) has been characterised at 1.6 GPa at room temperature by high-pressure neutron powder and X-ray single-crystal diffraction techniques. This is the first crystalline phase obtained upon compression of liquid nitric acid at room temperature and appears to be the stable phase up to pressures of at least 4 GPa. The crystal structure of this new phase shows some similarities to that of the low-temperature phase of nitric acid at ambient pressure, which has been redetermined as part of this study. Both structures share a herringbone packing of hydrogen-bonded molecular catemers, although the presence of disorder within the hydrogen bonds within one of the catemers of the low-temperature phase makes its structure comparatively more complex.

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High Pressure Raman Spectroscopy of Nitric Acid

Cited by 22 publications

References 19 publications

Thermal decomposition of molten ammonium nitrate (AN)

Thermal decomposition of molten ammonium nitrate (AN)

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid

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