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Ezahri, M.; Hadek, M. El; Coffy, G.; Mentzen, B. F.

doi:10.1023/a:1014913400625

Cited by 5 publications

(4 citation statements)

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“…Many researchers studied the mechanism and kinetics of these complex reactions that can be classified into several groups according to the nature of the initial iron-bearing phase. Examples are as follows: the thermal decompositions of iron(III) compounds including FeO(OH), − Fe 2 (C 2 O 4 ) 3 , − Fe 2 (SO 4 ) 3 , − Fe(OH) 3 , (NH 4 ) 2 Fe(SO 4 ) 2 , Fe(OH)SO 4 , − NaFe(SO 4 ) 2 , Na 3 Fe(SO 4 ) 3 , , FeCl 3 , , Fe(OH)CO 3 , and NH 4 Fe(C 2 O 4 ) 2 ; the thermally induced oxidation of metal iron, , Fe 3 O 4 , , and iron(II) compounds including FeCl 2 , FeSO 4 , − FeS, , FeC 2 O 4 , ,− and iron(II) malate; the thermally induced solid-state reaction of NaCl with Fe 2 (SO 4 ) 3 ; , the thermal transformations of iron complexes such as iron carbonyl systems, − iron carboxylate complexes, , and (NH 4 ) 3 [Fe(C 2 O 4 ) 3 ]; and the conversions of iron-bea...…”

Section: Thermal Transformations Of Iron-bearing Materialsclassifica...mentioning

confidence: 99%

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

2002

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Structural and magnetic properties, methods of synthesis, and applications of seven iron-(III) oxide polymorphs, including rare beta, epsilon, amorphous, and high-pressure forms, are reviewed. Thermal transformations resulting in the formation of iron oxides are classified according to different parameters, and their mechanisms are discussed. 57 Fe Mo ¨ssbauer spectroscopy is presented as a powerful tool for the identification, distinction, and characterization of individual polymorphs. The advantages of Mo ¨ssbauer spectroscopy are demonstrated with two examples related to the study of the thermally induced solid-state reactions of Fe 2 (SO 4 ) 3 . Lead-InIron(III) oxide is not only a strategic industrial material but also a convenient compound for the general study of the polymorphism and the mutual polymorphous changes in nanoparticles. The existence of amorphous Fe 2 O 3 and four polymorphs (alpha, beta, gamma, and epsilon) has been established. Their discoveries as well as the majority of formation processes are connected with thermal transformations of iron-bearing materials in an oxidizing atmosphere. 57 Fe Mo ¨ssbauer spectroscopy is a unique method that allows one to distinguish and identify individual structural forms, amorphous and nanostructured Fe 2 O 3 particles, to analyze their magnetic properties and to study their formation mechanism during thermally induced solidstate reactions. In this review, thermal processes resulted in the Fe 2 O 3 formation are classified from different viewpoints and their mechanism is discussed. Applications, structural and magnetic properties, and methods of synthesis of all known forms of iron(III) oxide and their Mo ¨ssbauer characterization are also summarized. A detailed survey of the properties of rare forms (amorphous Fe 2 O 3 , β-Fe 2 O 3 , -Fe 2 O 3 , and highpressure Fe 2 O 3 ) is presented for the first time. With respect to the more known R-Fe 2 O 3 and γ-Fe 2 O 3 , the presented data spring from a series of previous works, including the excellent book by R. M. Cornell and U. Schwertmann. 1 Some unresolved problems, such as the relation between the properties of the original ferrogenous precursor and the structure of the formed iron-(III) oxide, or the experimental possibility to distinguish the amorphous Fe 2 O 3 from nanostructured γ-Fe 2 O 3 or R-Fe 2 O 3 particles are discussed. The value of Mo ¨ssbauer spectroscopy for the characterization of iron(III) oxides produced by thermal processes is demonstrated with two experimental examples taken from our work in the field. † Dedicated to R. L. Mo ¨ssbauer on the occasion of the 40 th jubilee of Nobel Prize presentation.

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Section: Thermal Transformations Of Iron-bearing Materialsclassifica...mentioning

confidence: 99%

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

2002

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“…La préparation du trisoxalatoaluminate (ILI) d'ammonium a déjà été décrite [ 6 ] . La stoechiométrie des composés a été vérifiée par dosage des ions oxalates par manganimétrie et des ions métalliques par spectroscopie d'émission Plasma.…”

Section: Techniques Expérimentales Et Produit De Départunclassified

“…Ce système binaire a été déjà publié [6]. Il présente trois paliers d'invariance : L'eutexie glace + (N&)3A1(C204)3, 3H20 à -7,s°C avec une composition du point eutectique de 33 gramme % en sel anhydre.…”

Section: Diagramme Binaire H20-(nh)3al(c204)3unclassified

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Contribution à l'étude du système ternaire H₂O-(NH₄)₃Al(C₂O₄)₃-(NH₄)₂MO₂O₅(C₂O₄)₂. L'isotherme 25 °C

et al. 2001

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Abstract. The H20-(NH4)2M0205(C204)2 binary system has been investigated in the -20 to 75°C temperature range. An incongmently melting dihydrate is observed. The solubility curves at 25OC for H20-(NH4)3A1(C204)3-(NH4)2M0205(C204)Z system have been established using conductivity and analytical techniques. In the temary diagram the liquidus curve exhibits two branches corresponding to the saturation in (NH4);A1(C204);, 3H20 and ( N H~)~M o A~( C~O~)~, 2H20.

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Lithium Tris(Oxalato)Aaluminate and its Hydrates: Structure, Dehydration and Thermal Decomposition

Missyul,

Kreuzer,

Usoltsev

et al. 2024

Zeitschrift anorg allge chemie

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The double oxalates MI3[MIII(C2O4)3] possess rich crystallochemistry and can be used as precursors for various ceramic materials. The article discusses a case of Li3[Al(C2O4)3]. A series of previously unknown hydrates (Li3[Al(C2O4)3]·5.5H2O, Li3[Al(C2O4)3]·4H2O, Li3[Al(C2O4)3]·H2O) was found for this composition, their crystal structure and temperatures of mutual transformations determined. Transformation from Li3[Al(C2O4)3]·4H2O to Li3[Al(C2O4)3]·H2O was found to be accompanied by a change in the topology of the bonding network. Uniaxial negative thermal expansion was found for anhydrous Li3[Al(C2O4)3]. Thermal decomposition of Li3[Al(C2O4)3] was demonstrated to be a promising way to obtain precursors for aluminate ceramics.

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Cited by 5 publications

References 5 publications

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

Contribution à l'étude du système ternaire H₂O-(NH₄)₃Al(C₂O₄)₃-(NH₄)₂MO₂O₅(C₂O₄)₂. L'isotherme 25 °C

Lithium Tris(Oxalato)Aaluminate and its Hydrates: Structure, Dehydration and Thermal Decomposition

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Cited by 5 publications

References 5 publications

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications

Contribution à l'étude du système ternaire H2O-(NH4)3Al(C2O4)3-(NH4)2MO2O5(C2O4)2. L'isotherme 25 °C

Lithium Tris(Oxalato)Aaluminate and its Hydrates: Structure, Dehydration and Thermal Decomposition

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Contribution à l'étude du système ternaire H₂O-(NH₄)₃Al(C₂O₄)₃-(NH₄)₂MO₂O₅(C₂O₄)₂. L'isotherme 25 °C