Phase equilibria in the system Nd2O3−P2O5−H2O and growth of NdP5O14 single crystals under hydrothermal conditions

Yoshimura, Masahiro; Fujii, Kimio; Sōmiya, Shigeyuki

doi:10.1016/0022-0248(85)90088-0

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“…Here, a brief description is given on the compounds whose existence should be confirmed, La 5 PO 10 , La 7 P 3 O 18 , La 4 (P 2 O 7 ) 3 , and La 2 P 4 O 13 . Since the Nd 2 O 3 -P 2 O 5 system has considerable similarity with the La 2 O 3 -P 2 O 5 system in phase equilibrium behaviors, [20,[24][25][26][27] the information on analogous compounds in the Nd 2 O 3 -P 2 O 5 system is also presented below.…”

Section: Introductionmentioning

confidence: 99%

Reinvestigation of the Phase Equilibria in the La2O3-P2O5 System

Hatada

Nagai

Nosé

et al. 2013

J. Phase Equilib. Diffus.

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The phase equilibria between the solid phases in the La 2 O 3-P 2 O 5 system were reinvestigated with solid state reaction method. The existence of La 3 PO 7 , La 7 P 3 O 18 , LaPO 4 , and LaP 3 O 9 was confirmed. La 7 P 3 O 18 can form only at $1200°C or higher possibly due to kinetic reasons, but it is stable at lower temperatures. On the other hand, three intermediate compounds proposed to exist, La 5 PO 10 , La 4 (P 2 O 7) 3 , and La 2 P 4 O 13 were not obtained in this study. Based on the literature, La 4 (P 2 O 7) 3 and La 2 P 4 O 13 are considered to be metastable phases, although thermodynamic evidence is still required.

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Section: Introductionmentioning

confidence: 99%