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The Al 2 O3‐Nd 2 O 3 Phase Diagram
Author(s) -
COUTURES J. P.
Publication year - 1985
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.1151-2916.1985.tb09645.x
Subject(s) - phase diagram , eutectic system , perovskite (structure) , phase (matter) , crystallography , solid state , materials science , melting point , diagram , congruent melting , solid solution , chemistry , mineralogy , metallurgy , microstructure , mathematics , statistics , organic chemistry , composite material
A tentative phase diagram for the system Al 2 0 3 ‐Nd 2 O 3 is presented. Three compounds were obtained: a β ‐A1 2 O 3 ‐type compound, the perovskite NdAlO 3 , and Nd 4 Al 2 O 9 . The perovskite melts congruently (mp 2090°C), and the two other compounds exhibit incongruent melting behavior: β ‐Nd/Al 2 O 3 , mp 1900°C; Nd 4 Al 2 O 9 , mp 1905°C. Two eutectics exist with the following compositions and melting points: 80 mol% Al 2 O 3 , 1750°C; 23 mol% Al 2 O 3 ,1800°C. Nd 4 Al 2 O9 decomposes in the solid state at 1780°C.