Toubkal : Le Catalogue National des Thèses et Mémoires
Hihg-Pressure of M2AX (211), M3AX2 (312) and M4AX3 (413) MAX phases, Sr2MWO6 (M = Ca, Cd, Co) Double Perovskites, SrNi3(P2O7)2 and NaCo(H2PO3)3.H2O phosphates, using angle dispersive X-ray diffraction and Raman Spectroscopy
dc.contributor.author | Manoun, Bouchaib | |
dc.date.accessioned | 2008-04-21T14:58:36Z | |
dc.date.available | 2008-04-21T14:58:36Z | |
dc.date.issued | 2006 | |
dc.identifier.uri | http://hdl.handle.net/123456789/1081 | |
dc.description.abstract | The present study reports on Angle Dispersive X-ray diffraction and Raman Spectroscopic High Pressure Studies of M2AX (211), M3AX2 (312) and M4AX3 (413) MAX phases, Sr2MWO6 (M = Ca, Cd, Co) Double Perovskites, SrNi3(P2O7)2 and NaCo(H2PO3)3.H2O phosphates. Up to a pressure of 55 GPa, no phase transformations were observed in the MAX phases. Based on the nature of the M, A or X element a large effect on the bulk moduli of the MAX phases was observed. The presence of X in the structure has a stablizing effect on the M-Al bonds, presumably by pulling electrons away from those bonds into the M-X bonds. The double perovskites Sr2MWO6 (M = Ca, Cd, Co) underwent a phase transition at 10.4 GPa, for Sr2CaWO6 and at 15 Gpa for Sr2CdWO6. Two phase transitions were observed in the case of the co-containing compound at about 2 and 11 GPa, the first transition is from tetragonal structure (14/m) to P21/nSr2CaWO6-like structure. A phase transition was observed in the pyrophosphate SrNi3(P2O7)2 at 50.5 GPa for, the new high pressure phase has a tetragonal symmetry. In NaCo(H2PO3)3.H2O phosphate an amorphization occurred at pressures higher than 7 GPa. | en |
dc.format.extent | 19968 bytes | |
dc.format.mimetype | application/msword | |
dc.language.iso | en | en |
dc.publisher | Université Sidi Mohamed Ben Abdellah, Faculté des Sciences Dhar El Mehraz, Fès | en |
dc.relation.ispartofseries | Th-541/MAN | |
dc.subject | MAX phase | en |
dc.subject | Double Perovskite | en |
dc.subject | Pyrophosphate | en |
dc.subject | Dihydrogenphosphite | en |
dc.subject | Synchrotron radiation | en |
dc.subject | Raman spectroscopy | en |
dc.subject | High pressure | en |
dc.subject | Diamond anvil cell | en |
dc.subject | Chimie-Physique | |
dc.subject | Sciences des matériaux | |
dc.title | Hihg-Pressure of M2AX (211), M3AX2 (312) and M4AX3 (413) MAX phases, Sr2MWO6 (M = Ca, Cd, Co) Double Perovskites, SrNi3(P2O7)2 and NaCo(H2PO3)3.H2O phosphates, using angle dispersive X-ray diffraction and Raman Spectroscopy | en |
dc.description.laboratoire | Physico-Chimie Moléculaire, (UFR) |
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