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Journal ArticleDOI

Preparation of chromium(III) spinels by the solid state reaction between potassium dichromate and hydrated metal chlorides

16 Dec 1982-Thermochimica Acta (Elsevier)-Vol. 59, Iss: 3, pp 379-382
About: This article is published in Thermochimica Acta.The article was published on 1982-12-16. It has received 3 citation(s) till now. The article focuses on the topic(s): Potassium dichromate & Chromium. more

Topics: Potassium dichromate (66%), Chromium (63%)
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Journal ArticleDOI
S. Sundar Manoharan1, K.C. Patil1Institutions (1)
Abstract: Fine-particle metal chromites (MCr2O4, where M = Mg, Ca, Mn, Fe, Co, Ni, Cu, and Zn) have been prepared by the combustion of aqueous solutions containing the respective metal nitrate, chromium(III) nitrate, and urea in stoichiometric amounts. The mixtures, when rapidly heated to 350°C, ignite and yield voluminous chromites with surface areas ranging from 5 to 25 m2/g. MgCr2O4, sintered in air at 1500°C for 5 h, has a density of 4.0 g/cm3. more

163 citations

Journal ArticleDOI
H. D. Lutz1, B. Müller1, H.J. Steiner1Institutions (1)
Abstract: The infrared reflection and Raman spectra of spinel type oxides M Cr 2 O 4 ( M = Mg, Mn, Fe, Co, Ni, Cu, Zn), M Fe 2 O 4 ( M = Ni, Cu), and Mn 3 O 4 (single crystals, pressed pellets) including Kramers-Kronig analyses and oscillator-fit calculations are presented. The spectra are discussed with respect to the true space group and ionicities of these compounds as well as the vibrational modes, phonon energies, and resonance Raman effects compared with the respective spectra of spinel type halides, sulfides, and selenides. Because of the relatively high porosity of the pellets obtainable the true frequencies of the IR allowed phonons can only be determined from single crystal spectra. more

117 citations

Journal ArticleDOI
Rania Zaky1, T.A. Yousef, A.M. AbdelghanyInstitutions (1)
Abstract: The chelation behaviour of 4-(( E )-2-(1-(thiophen-2-yl)ethylidene)hydrazinyl)-1-(4-methoxyphenyl)-1 H -pyrrole-3-carbonitrile (HL) towards Cu(II) ions has been investigated. These Cu(II) complexes are characterized by elemental analyses, molar-solid conductance, ESR, FTIR and electronic spectral studies. Also, the kinetic and thermodynamic parameters ( E a , A , Δ H , Δ S , Δ G ) for all thermal decomposition steps have been evaluated using Coats–Redfern and Horowitz–Metzger methods. Furthermore, antimicrobial activity of the ligand and its complexes were studied against Gram-negative bacteria: Escherichia coli , Gram-positive Bacillus cereus , Bacillus subtilis and pathogenic fungi Pseudomonas aeruginosa by using minimum inhibitory concentrations (MICs) method. more

15 citations

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Journal ArticleDOI
Z. Gabelica, Eric G. Derouane, R. Hubin1Institutions (1)
Abstract: The thermal decompositions in vacuum of the compounds ZnCrO4, ZnCrO4·3.5 Zn(OH)2·H2O and CuCrO4 have been investigated using a combination of various techniques: TG, EPR, IR and X-ray. more

7 citations

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