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New Solid Solutions and Phase Equilibria in the Rb 3 Y(PO 4 ) 2 –BaRbPO 4 System
Author(s) -
Pelczarska Aleksandra,
Radomińska Ewa,
Znamierowska Teresa
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14106
Subject(s) - eutectic system , solid solution , phase diagram , analytical chemistry (journal) , atmospheric temperature range , phase (matter) , solubility , hexagonal crystal system , chemistry , solid solubility , materials science , crystallography , thermodynamics , microstructure , physics , metallurgy , chromatography , organic chemistry
A phase diagram of the Rb 3 Y( PO 4 ) 2 –BaRb PO 4 system for the whole range of compositions, up to a temperature of 1700°C, has been developed on the basis of the results of thermal and XRD analyses and microscopic examinations. The investigated system has an eutectic character. Limited solid solutions with the high‐temperature (α) and low‐temperature (β) structure of BaRb PO 4 form in this system. The maximum solubility of Rb 3 Y( PO 4 ) 2 in the high‐temperature solid solution (α ss ) occurs at the eutectic temperature (1275°C), amounting to ~80 mass% Rb 3 Y( PO 4 ) 2 . At 988°C, the α ss decomposes according to eutectoidal reaction: α ss ↔ β s + Rb 3 Y(PO 4 ) 2 . The maximum content of Rb 3 Y( PO 4 ) 2 in the low‐temperature limited solid solution (β ss ) does not exceed 10 mass% Rb 3 Y( PO 4 ) 2 . The α ss phase has a hexagonal glaserite‐like structure with the unit cell parameters a ≈ 5.7 and b ≈ 8.1 Å.