Thermal decomposition of aqueous manganese nitrate solutions and anhydrous manganese nitrate. Part 4. Non-isothermal kinetics

Bruijn, T J W de; İpekoğlu, A. Nursen; Jong, W.A. De; Berg, P.J. Van Den

doi:10.1016/0040-6031(81)85090-3

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…For the first stage of decomposition of the nitrate, the authors of [6,13] offer the equation of Avrami-Erofeev and accordingly compute E* --90 kJ/mol and E* ffi 120 kJ/mol. The latter is very close to our computed value of E* --127 kJ/mol.…”

Section: Experimental Data and Discussionmentioning

confidence: 99%

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The thermal dehydration, decomposition and kinetics of Mn(NO3)2 · 6H2O and its deuterated analogue

Maneva

Petroff

1990

Journal of Thermal Analysis

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The processes of thermal dehydration and decomposition of Mn(NOs)2".6H20 and its deuterated analogue were studied by DTA, TG and DSC. Comparisons were made between the data obtained for the two compounds. The following phase transitions were observed: melting of the compound; dehydration to monohydrate; dehydration of the monohydrate, accompanied by its partial decomposition to MnO2; and decomposition of the anhydrous nitrate to MnO2.The DSC data were used to determine the enthalpies of the phase transitions, and those corresponding to the partial dehydration were compared with the calculated ones. The formal kinetic parameters (E* and A) for the three stages (without the melting stage) were calculated from the TG curves, and the corresponding kinetic equations are reported.The pertinent literature contains data about the thermal decomposition of aqueous solutions of Mn(NO2)2. According to [1][2][3], for instance, the water is evaporated until the formation of a solution containing Mn(NO3)2 and H20 in a mole ratio of 1:1, whereas [4,5,9,10] give this mole ratio as 1:2. This is followed by decomposition of the nitrate to MnO2, which according to [1,2,4,9] [10]. The thermal decomposition of Mn(NO3)2"6H20 has been studied in [8], with the authors describing fusion of the salt, dehydration to Mn(NO3)2.1.7H20 and decomposition to MnO2.All authors report MnO2 as the end-product of the thermal decomposition, but according to [10] it contains impurities of Mn203.

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Section: Experimental Data and Discussionmentioning

confidence: 99%

“…Formal kinetic parameters relating to the thermal decomposition of aqueous solutions of Mn(NO3)2 have been calculated in [4,6,12,13], the results presented in [12] being based on thermogravimetric data.…”

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confidence: 99%

The thermal dehydration, decomposition and kinetics of Mn(NO3)2 · 6H2O and its deuterated analogue

Maneva

Petroff

1990

Journal of Thermal Analysis

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“…where V o and V 1 are the initial and final volumes, respectively, along the transformation process, k is related to the speed of the reaction, and n is a dimension associated to the diffusion process and to the nucleation and growth mechanism. 37 As can be seen in Figure 4(b), the theoretical time dependence of the volume fraction of nanoplatelets proposed by Avrami (Eq. (2)) fits well to the experimental curve.…”

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confidence: 84%

In situ study of the endotaxial growth of hexagonal CoSi2 nanoplatelets in Si(001)

Costa

Huck‐Iriart

Kellermann

et al. 2015

Applied Physics Letters

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This investigation aims at studying-by in situ grazing-incidence small-angle x-ray scattering-the process of growth of hexagonal CoSi 2 nanoplatelets endotaxially buried in a Si(001) wafer. The early formation of spherical Co nanoparticles with bimodal size distribution in the deposited silica thin film during a pretreatment at 500 C and their subsequent growth at 700 C were also characterized. Isothermal annealing at 700 C promotes a drastic reduction in the number of the smallest Co nanoparticles and a continuous decrease in their volume fraction in the silica thin film. At the same time, Co atoms diffuse across the SiO 2 /Si(001) interface into the silicon wafer, react with Si, and build up thin hexagonal CoSi 2 nanoplatelets, all of them with their main surfaces parallel to Si{111} crystallographic planes. The observed progressive growths in thickness and lateral size of the hexagonal CoSi 2 nanoplatelets occur at the expense of the dissolution of the small Co nanoparticles that are formed during the pretreatment at 500 C and become unstable at the annealing temperature (700 C). The kinetics of growth of the volume fraction of hexagonal platelets is well described by the classical Avrami equation. V

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“…The method is supposed to yield a significant reduction in the effort and time required for calculations and an increase in precision over the Freeman-Carroll method (172). Kinetics, mechanisms, and other thermodynamic parameters for the thermal decomposition of aqueous manganese nitrate solutions and anhydrous Mn(N03)2 were studied by thermal and other techniques (42)(43)(44)(45)(46). The isothermal and dynamic TG methods for the determination of the kinetics of the solid-phase deaquation-anation reactions of [Co-(NH3)6H20]X, where X = Cl, Br and N03, were reported (131).…”

Section: Differential Thermal Analysis and Differential Scanning Calo...mentioning

confidence: 99%

Thermal analysis

Wendlandt¹

1982

Anal. Chem.

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after 22 years of editing this review (160), has decided to turn the job over to another author. It is with a deep sense of responsibility and dedication that I hereby accept this challenge. The workers in the field of thermal analysis, as well as myself, should be eternally grateful to Dr. Murphy for his devoted and accurate reporting of thermal analysis activities as they occurred through the years. I only hope that I can continue this tradition in the manner and spirit that he did.As usual, this review covers the almost 2-year period from January 1980 through November 1981. Unfortunately, not all of the thermal analysis papers can be described here, due to their magnitude. An attempt has been made, however, to include representative studies in all of the thermal analysis areas as well as, in my judgement, new and novel ideas and developments. Due to space limitations, very few review articles (of which there are many), books, and meetings are included here.

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Thermal decomposition of aqueous manganese nitrate solutions and anhydrous manganese nitrate. Part 4. Non-isothermal kinetics

Cited by 7 publications

References 14 publications

The thermal dehydration, decomposition and kinetics of Mn(NO3)2 · 6H2O and its deuterated analogue

The thermal dehydration, decomposition and kinetics of Mn(NO3)2 · 6H2O and its deuterated analogue

In situ study of the endotaxial growth of hexagonal CoSi2 nanoplatelets in Si(001)

Thermal analysis

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