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Phase equilibrium in the system LaP3O9−NaPO3−P2O5

The new compounds NH4LaP4O12 and La4(P2O7)3

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Abstract

The phase diagram of the ternary system LaP3O9−NaPO3−P2O5 was constructed through the use of a new compound NH4LaP4O12. Ammonium lanthanum phosphate NH4LaP4O12 crystallizes in the monoclinic system, space group C2/c, witha=7.941(4)Å,b=12.645(13)Å,c=10.702(9)Å, γ=110.00(5). The compound melts incongruently at 1198°C. Lanthanum pyrophosphate melts incongruently at 1160°C.

Zusammenfassung

Unter Einsatz der neuen Verbindung NH4LaP4O12 wurde das Phasendiagramm des ternären Systemes LaP3O9−NaPO3−P2O5 erstellt. Das Ammoniumlanthanphosphat NH4LaP4O12 kristallisiert im monoklinen System, Raumgruppe C2/c mita=7.941(4)Å,b=12.645(13)Å,c=10.702(9)Å, γ=110.00(5). Die Verbindung schmilzt inkongruent bei 1198°C. Lanthanpyrophosphat schmilzt inkongruent bei 1160°C.

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  1. Technological Institute of Chemical and Food Industry, Komandorska 118, 53-326, Wrocław, Poland

    J. Kropiwnicka

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Kropiwnicka, J. Phase equilibrium in the system LaP3O9−NaPO3−P2O5 . Journal of Thermal Analysis 44, 725–731 (1995). https://doi.org/10.1007/BF02636290

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  • DOI: https://doi.org/10.1007/BF02636290

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