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Thermal analysis of hexadecyltrimethylammonium-montmorillonites

Part 2. Thermo-XRD-spectroscopy-analysis

Journal of Thermal Analysis and Calorimetry
Authors: Isaak Lapides, Mikhail Borisover, and Shmuel Yariv

Relative intensity Nm Relative intensity Spinel [ 27 ]; Quartz [ 28 ] 0.427 23.0 0

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substrate diffuse through the chrome oxide scale and transform it into a spinel-mixed Fe–Cr oxide, while the continuous Fe diffusion through this scale results in the formation of a Fe 2 O 3 compound over the scale, as Cr cannot easily diffuse through the

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the loss of leftover interlayer anions. Another endothermic transition without significant mass loss is observed between 680 and 830 °C indicating stoichiometric spinel phase and single magnesium-oxide phase formation. Figure 4 shows

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, A , Saberi , A , Afshar , S . Synthesis and characterization of nanocrystalline MgAl 2 O 4 spinel via sucrose process . Mater Res Bull . 2008 ; 43 : 1188 – 1194 . 10.1016/j.materresbull.2007.05.031 . 8

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-8853(02)00449-3 . 12. Kikukawa , N , Takemori , M , Nagano , Y , Sagasawa , M , Kobayashi , S . Synthesis and magnetic properties of nanostructured spinel ferrites using a glycine–nitrate process . J Magn Magn Mater . 2004 ; 284

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. Niculescu , M , Birzescu , M , Dumitru , R , Sisu , E , Budrugeac , P . Co(II)–Ni(II) heteropolynuclear coordination compound obtained through the reaction of 1,2-propanediol with metallic nitrates as precursor for mixed oxide of spinel type NiCo 2

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) evidence only the diffraction peaks characteristic to the spinel phase of Ni–Zn ferrite. The crystallization degree increases with the annealing temperature (600, 800 °C). At 800 °C the Ni, Zn ferrite appears well crystallized in all cases (Fig. 7

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formation of spinel phases in the CoO–In 2 O 3 system. For this purpose five mixtures were made of the CoCO 3 /In 2 O 3 molar ratio of 3:1, 2:1, 1:1, 1:2, and 1:3. The samples were heated in the following cycles: at 650 °C(12 h), 750 °C(12 h), 850 °C(12 h

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the requirements for minimal content of not decomposed kaolinite in it and for minimal advancement of secondary reactions, leading to the conversion of MK into a chemically inactive phase with a spinel structure [ 9 , 10 ]. From the three

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, Ivankovič , H , Petric , B . Thermodynamic analysis of results obtained by examination of the forsterite and spinel formation reactions in the process of magnesium oxide sintering . Ind Eng Chem Res . 1989 ; 28 : 298 – 302 . 10.1021/ie00087a008

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