Etude du systeme KPO3-LaP3O9. Donnees cristal lographiques sur K2La(PO3)5 et (NH4)2La(PO3)5 |
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Authors: | M Ferid NK Ariguib M Trabelsi |
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Affiliation: | Laboratoire de Physico-Chimie Minérale. Ecole Normale Supérieure 43, Rue de la Liberté, le Bardo TunisTunisie |
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Abstract: | The system KPO3-LaP3O9 has been studied for the first time by differential thermal analysis and X ray diffraction. The system shows two compounds KLa(PO3)4 and K2La(PO3)5 which melt in a peritectic decomposition at 880°C and 770°C respectively. An eutectic point appears at 705°C; The eutectic point corresponds to a concentration of 10% molar LaP3O9.Infra Red absorption spectra are typical of chain phosphates.The new compound K2La(PO35 is isotypic whith (NH4)2La(PO3)5 which has been synthetized for the first time. They belong to the triclinic system whith space group P1 and Z = 2. The parameters of the unit cell are: α = 90°3(1) β = 109°17(7) γ = 89°90(4) for K2La(PO3)5 and: α = 90°6(2) β = 107°4(1) γ = 89°82(7) for (NH4)2La(PO3)5. |
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