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Subsolidus Relations in the System SiO 2 — Al 2 O3— P 2 O5
Author(s) -
ROBINSON P.,
McCARTNEY ERIC R.
Publication year - 1964
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/j.1151-2916.1964.tb13824.x
Subject(s) - cristobalite , electron microprobe , ternary operation , microprobe , solid solution , crystallography , mineralogy , chemistry , phase diagram , lattice (music) , phase (matter) , materials science , quartz , organic chemistry , metallurgy , computer science , programming language , physics , acoustics
Phase relations in that part of the system SiO 2 ‐Al 2 O 5 ‐P 2 O6 below 50 mole % P 2 O 3 were investigated at subsolidus temperatures. The only ternary compositions which crystallized readily were those lying close to binary compounds and no evidence for ternary compound formation was found. Solid solution between silica and aluminum phosphate, expected on the basis of closely similar lattice dimensions and physical properties, was not indicated by X‐ray diffraction, refractive index, or electron‐beam microprobe results. Above 80% silica and at a temperature of 1400°C, the only crystalline species was cristobalite whereas below 60% silica, only the cristobalite form of AlPO 4 was present. Coexistence of these two constituents seemed to be inhibited, possibly because of the strong glass‐forming properties of the component oxides.