Thermal properties of ammonium nitrate

Jóna, E.; Šramko, T.; Nagy, D.

doi:10.1007/bf01907319

Cited by 12 publications

(4 citation statements)

References 9 publications

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“…Further increase in moisture content, in the investigated interval, does not influence the temperatures observed. The temperatures determined with this technique under the given conditions agree with those in the literature [1][2][3][4]16] (Fig. 2).…”

Section: Resultssupporting

confidence: 84%

“…The shapes of the DTA curves and the temperatures of the crystal transformations for ammonium nitrate generally agree well with the literature data [2,4,10,12,15], but in the case of [1] only for the samples with higher water contents. Brown and McLarsen [1] have suggested that the IV ~IlI phase transformation takes place only in the presence of moisture, via a dissolution and recrystallization mechanism involving drastic structural change.…”

Section: Resultssupporting

confidence: 76%

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Influence of frequent rhombic-monoclinic crystal transformation and of moisture content on ammonium nitrate crystal transformation energies

Rasulić¹,

Milanović²,

Jovanović³

1988

Journal of Thermal Analysis

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The aim of this paper was to determine the influence of a great number of successive rhombic monoclinic crystal transformations on the ammonium nitrate crystal transformation energies. The energies of ammonium nitrate crystal transformations from rhombic into monoclinic, from monoclinic into trigonal and from trigonal into cubic were observed as functions of the number of previous crystal transformations and the moisture content.The phase transformations of ammonium nitrate have been extensively investigated by DTA, DSC and dilatometry [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The structures of the phases have also been investigated [16][17][18][19][20][21][22]. Open questions remain as regards the behaviour of ammonium nitrate in the temperature range from 30 ~ to about 60 ~ and the influence of repetition of heating and cooling cycles through the NH4NOa(IV) .-~--NH4NOa(III) phase transformation point [1,17,19,21].The purpose of the present work was to investigate the changes in temperature and energy of the rhombic into monoclinic (IV ~III), monoclinic into trigonal (III ~II) and trigonal into cubic (II ~I) crystal transformations for prilled ammonium nitrate samples after 5,10,15,20, 35 and 50 rhombic-monoclinic crystal transformations. The ammonium nitrate samples contained from 0.01 to 1.21% (mass) of moisture, and the influence of the moisture content on the crystal transformation energies was also investigated.

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 76%

Influence of frequent rhombic-monoclinic crystal transformation and of moisture content on ammonium nitrate crystal transformation energies

Rasulić¹,

Milanović²,

Jovanović³

1988

Journal of Thermal Analysis

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“…Unless specified, thermal properties of solid ammonium nitrate are used for the aerosols and those of germanium are used for the substrate (Table I). [25][26][27] The time-dependent temperature profile in the surrounding air is obtained by having the COMSOL Multiphysics software solve the thermal diffusion equation (Eq. 1) with boundary conditions set at zero temperature (assuming no convective heat transfer at the surfaces of the aerosol and the substrate).…”

Section: Methodsmentioning

confidence: 99%

Finite Element Analysis Modeling of Pulse-Laser Excited Photothermal Deflection (Mirage Effect) from Aerosols

Dada

Bialkowski

2008

Appl Spectrosc

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A finite element analysis method for numerical modeling of the photothermal deflection spectroscopy of aerosols is presented. The models simulate pulse-laser excited photothermal deflection from aerosols collected on a plane surface substrate in air medium. The influence of the aerosol and substrate properties on the transient photothermal deflection signal is examined. We have previously obtained experimental results for photothermal deflection spectrometry of aerosols deposited onto a plate from an impactor system (O. O. Dada and S. E. Bialkowski, Appl. Spectrosc. 62, 1336 (2008)). This paper supports the validity of the experimental results presented in that paper and helps in answering some of the questions raised. The modeling results presented here demonstrate that the (peak) normalized transient temperature change profile and (peak) normalized transient photothermal deflection profile are a good approximation and invariant with number of particles, inter-particle distance, and particulate shape, which suggests that the photothermal deflection signal amplitude may be calibrated linearly with total mass of aerosols and the method could be applied to analysis of complex aerosols.

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“…Inorganic Materials. The reproducibility of the DTA curves of NH4N03 as functions of grain size and atmosphere was studied with a derivatograph (67). Transitions investigated included the IV -* III, III -* II, and II -I.…”

mentioning

confidence: 99%

Thermal analysis

Wendlandt¹

1986

Anal. Chem.

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Thermal properties of ammonium nitrate

Cited by 12 publications

References 9 publications

Influence of frequent rhombic-monoclinic crystal transformation and of moisture content on ammonium nitrate crystal transformation energies

Influence of frequent rhombic-monoclinic crystal transformation and of moisture content on ammonium nitrate crystal transformation energies

Finite Element Analysis Modeling of Pulse-Laser Excited Photothermal Deflection (Mirage Effect) from Aerosols

Thermal analysis

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