Thermal decomposition of Ni(II) and Fe(III) acetates and their mixture

Elmasry, M. A. A.; Gaber, Abd El‐Aal M.; Khater, E. M. H.

doi:10.1007/bf01981811

Cited by 23 publications

(20 citation statements)

References 4 publications

(1 reference statement)

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“…In studies on the physical and chemical properties and the structures of solid complexes of transition metal ions with organic ligands, it is customary to investigate the thermal decomposition of these complexes so as to obtain useful data on the metal-ligand bonds [2][3][4] and stability trends. The thermal investigations on some derivatives of amines [5], sulfonamides [6], substituted thiourea salts [7], and complexes of bidentate ligands and others [8][9][10][11][12][13], have already been published.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition and mass spectra of mixed ligand copper(II) complexes of 1,10-phenanthroline and coumarin derivatives

Kharadi

2011

J Therm Anal Calorim

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Four copper(II) new mix ligand complexes of the coumarin derivative (A 1 = 7-hydroxy-10,11-dihydroindeno [5,4-c]chromen-6(9H)-one, A 2 = 2-bromo-7-hydroxy-10,11-dihydroindeno[5,4-c]chromen-6(9H)-one, A 3 = 7-hydroxy-4-methoxy-10,11-dihydroindeno[5,4-c]ch romen-6(9H)-one, and A 4 = 5-hydroxy-8,9-dihydrobenzo[f]in deno [5,4-c]chromen-4(7H)-one) and 1,10-Phenanthroline have been synthesized. The structural interpretations were confirmed from elemental analyses, magnetic susceptibility and FAB mass spectral, as well as from IR spectral studies. From the analytical, spectroscopic, and thermal data, the stoichiometry of the mentioned complexes was found to be 1:1:1 (coumarin ligand:copper metal:1,10-Phenanthroline). The thermal stabilities of these complexes were studied by thermogravimetric (TG/DTG) and the decomposition steps of these four complexes are investigated. Kinetic parameters such as order of reaction (n) and the energy of activation (E a ) were calculated using Freeman-Carroll method. The pre-exponential factor (A), the activation entropy (S*), the activation enthalpy (H*), and the free energy of activation (G*) were calculated using Horowitz-Matzger equations. Based on the E a values, the thermal stabilities of complexes in the decreasing order are

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Section: Introductionmentioning

confidence: 99%

Thermal decomposition and mass spectra of mixed ligand copper(II) complexes of 1,10-phenanthroline and coumarin derivatives

Kharadi

2011

J Therm Anal Calorim

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“…After saturation, disk pallets were dried in 240°C and calcinated at 800°C in 10%H 2 /90%Ar mixture. The drying temperature was determined from TG/DTA curves of decomposition nickel nitrate in air atmosphere presented by Elmasary et al [19]. According to Elmasary, 240°C is a sufficient temperature for complete decomposition of nickel , platinum crucibles nitrate.…”

Section: Methods II (M Ii)mentioning

confidence: 99%

“…Oxalate salts are often used to obtain oxides [14][15][16][17][18]. Nickel oxalate, in contrast to the most d-electron metal salts, decomposes to metallic nickel instead of nickel oxide in inert atmosphere [19]. The results of measurements concerning the structure, microstructure, thermal, and electrical properties of the Ni/YSZ anode material testify to the usefulness of the oxalate and impregnation method.…”

Section: Introductionmentioning

confidence: 99%

Structural, microstructural, thermal, and electrical properties of Ni/YSZ cermet materials

Drożdż

Wyrwa

Broś

et al. 2012

J Therm Anal Calorim

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Ceramic-metal composites (cermets) containing 4 mol% yttria-zirconia (4YSZ) and Ni particles as anode materials in solid oxide fuel cells were prepared by two methods. The first method involves nickel oxalate dihydrate precipitation on the 4YSZ powder and decomposition at 360°C in inert Ar atmosphere. The second method consists of impregnation of the 4YSZ pellets with an aqueous solution of nickel nitrate. The temperature of oxalate decomposition was determined on the basis of TG/ DTA experiments. Gaseous products of decomposition were analyzed by mass spectrometry. The structure of the materials was characterized by X-ray diffraction, scanning electron microscopy, porosity studies, and particle size measurements. The thermal expansion coefficient (TEC) was determined by dilathometric method. Electrochemical impedance spectroscopy was used to determine the electrical conductivity. Thus, determined TECs, porosity, and electrical properties were found suitable for anode materials of fuel cells.

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“…To produce nanosized ferrite particles, some techniques such as chemical coprecipitation [3][4][5], hydrothermal synthesis [6], sol-gel [7,8] and freeze-drying of metal carboxylate solution [9] methods have been developed. Starting from metal carboxylate precursors, the authors commonly found that the composition of the oxide products depends considerably on the reaction conditions in the synthesis [10][11][12]. For instance, Elmasry and coworkers [10] found that the high rate of heating (above 10K/min) causes the increase of the decomposition temperature and the metal ions in the products are partially reduced.…”

Section: Introductionmentioning

confidence: 98%

“…Starting from metal carboxylate precursors, the authors commonly found that the composition of the oxide products depends considerably on the reaction conditions in the synthesis [10][11][12]. For instance, Elmasry and coworkers [10] found that the high rate of heating (above 10K/min) causes the increase of the decomposition temperature and the metal ions in the products are partially reduced. In such cases it has generally been proven that the reoxidation of the product takes place during further heating and enables the segregation of α-Fe 2 O 3 [13,14].…”

Section: Introductionmentioning

confidence: 98%

Influence of the starting powders on the synthesis of nickel ferrite

Kenfack

Langbein

2006

Cryst. Res. Technol.

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The thermal decomposition of freeze-dried nickel(II)-iron(III) formate was investigated by means of DTA, TG, mass spectrometry and X-ray powder diffractometry. For the preparation of homogeneous freeze-dried nickel(II)-iron(III) formate precursors, a rigorous control of nickel ion concentration in the precursor solution was required. The decomposition of the reactive nickel(II)-iron(III) formate does not only reflect aspects of single formates, but also an interaction between components which lowers the decomposition temperature. Crystalline nickel ferrite powders were obtained at 600-800°C. This temperature is quite lower than 1100°C employed for the ceramic method. In the presence of air, the regeneration of nickel ferrite from the taenite phase (γNi,Fe) is accomplished at 800°C. This temperature is also 300°C below the temperature employed when the mixtures NiO:α-Fe 2 O 3 or Ni:2Fe are the starting powders. The main reason for the high reactivity of the freeze-dried formates and the taenite alloy is the large homogeneity of these precursors.

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Thermal decomposition of Ni(II) and Fe(III) acetates and their mixture

Cited by 23 publications

References 4 publications

Thermal decomposition and mass spectra of mixed ligand copper(II) complexes of 1,10-phenanthroline and coumarin derivatives

Thermal decomposition and mass spectra of mixed ligand copper(II) complexes of 1,10-phenanthroline and coumarin derivatives

Structural, microstructural, thermal, and electrical properties of Ni/YSZ cermet materials

Influence of the starting powders on the synthesis of nickel ferrite

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