Structural investigations and calorimetric dissolution of manganese phosphate glasses
| Autor: | Refka Oueslati Omrani, J Videau, Abdelaziz El Jazouli, Saida Krimi, Ismail Khattech, Mohamed Jemal |
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| Přispěvatelé: | Laboratoire de Thermodynamique Appliquée (LR01S10), Université de Tunis El Manar (UTM), Laboratoire de Physico-Chimie des Matériaux Inorganiques, Faculté des Sciences Aïn Chock [Casablanca] (FSAC), Université Hassan II [Casablanca] (UH2MC)-Université Hassan II [Casablanca] (UH2MC), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Laboratoire de Chimie des Matériaux Solides, Faculté des Sciences Ben M'sik [Casablanca] |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Q2 and Q1 tetrahedral sites Depolymerization Metaphosphate Inorganic chemistry Oxide Calorimetric dissolution [CHIM.MATE]Chemical Sciences/Material chemistry Condensed Matter Physics Endothermic process Electronic Optical and Magnetic Materials chemistry.chemical_compound symbols.namesake Differential scanning calorimetry chemistry Materials Chemistry Ceramics and Composites symbols Glass transition Raman spectroscopy Dissolution Manganese phosphate glasses |
| Zdroj: | Journal of Non-Crystalline Solids Journal of Non-Crystalline Solids, Elsevier, 2014, 389, pp.66-71. ⟨10.1016/j.jnoncrysol.2014.02.006⟩ |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2014.02.006⟩ |
| Popis: | International audience; Two series of manganese phosphate glasses (50x/2)Na2O-xMnO-(50 − x/2)P2O5 and (50 − x)Na2O-xMnO-50P2O5 (0 ≤ x ≤ 33 mol%), were prepared and investigated by means of density measurements, molar volume evolutions, FTIR and Raman spectroscopy, differential scanning calorimetry and calorimetric dissolution. In both series, density and glass transition temperature increase with composition. For the first series of glasses (3 ≤ O/P ≤ 3.49), spectroscopic analysis indicates that the addition of MnO content induces an evolution of structural units from Q2 to Q1 tetrahedral sites indicating the depolymerization of phosphate chains. By introducing MnO oxide into the second glass series (O/P = 3), Psingle bondOsingle bondP linkages are disrupted, suggesting a structural changes in the vitreous network. Calorimetric dissolution of both series of glasses in 4.5% weight of H3PO4 solution shows that the dissolution phenomenon is endothermic for the low MnO content and becomes exothermic as MnO concentration increases. This behavior may be correlated to the structural modification resulted from the depolymerization of the infinite metaphosphate chains. |
| Databáze: | OpenAIRE |
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