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Introduction Four-phase spinel peridotite xenoliths occurring in alkaline basaltic rocks provide direct information about the conditions prevailing in the shallow subcontinental and oceanic lithospheric mantles. Peridotite

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Journal of Thermal Analysis and Calorimetry
Authors: Lucjan Chmielarz, Małgorzata Rutkowska, Piotr Kuśtrowski, Marek Drozdek, Zofia Piwowarska, Barbara Dudek, Roman Dziembaj, and Marek Michalik

high surface mixed metal oxides, with a high dispersion of introduced transition metals oxide species [ 2 – 6 ]. An increase in the calcination temperature results in the aggregation of these species and formation of the spinel phases [ 2 – 6

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. Preudhomme , J , Tarte , P 1972 Infrared studies of spinels-IV. Normal spinels with a high-valency tetrahedral cation . Spectrochim Acta 28A : 69 – 79 . 23. Dabrowska , G , Tabero , P

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) At 970 °C (sharp DTA exothermic peak), rebuilding of the metakaolinite internal structure takes place (Al, Si), spinel like phase in amorphous silica (SiO 2 ) matrix is formed. Structure of the spinel is rebuilt and next quantities SiO 2 expelled

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Moazzen 2014 ). The Piranshahr Ophiolite mantle sequence consists of serpentinite, tectonized harzburgite and minor lherzolite, dunite with cumulithic texture, wherlite, and troctolite with Cr-spinel (Fig.  4 ; Khodabandeh and Soltani 2004 ). They are

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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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, “ Highly efficient catalysts of Mn 1−x Ag x Co 2 O 4 spinel oxide for soot combustion ,” Catal. Commun. , vol. 101 , pp. 134 – 137 , 2017 . 10.1016/j.catcom.2017.08.007 [27] C. Cao , L. Xing , Y. Yang , Y. Tian , T. Ding , and J. Zhang

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have been corroborated by SEM image. Figure 2 presents a SEM image of Cu 2 In 2 O 5 . In order to show more clearly the shapes of the crystals of Cu 2 In 2 O 5 spinels, the image is presented in magnification of ×10,000. Figure 3 shows an image of

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requiers higher temperature. The final products of amosite decomposition above 900 °C (at isothermal soaking) are a spinel, hematite, magnetite, and cristobalite [ 31 , 38 ]. The thermal analysis of tremolite mainly shows an endothermic peak at ∼950 °C due

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