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Polymorphisme des solutions solides du sodium dans l'aluminate tricalcique
Author(s) -
Regourd M.,
Chromy S.,
Hjorth L.,
Mortureux B.,
Guinier A.
Publication year - 1973
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889873008885
Subject(s) - tetragonal crystal system , orthorhombic crystal system , crystallography , solid solution , materials science , cubic form , quenching (fluorescence) , chemistry , crystal structure , physics , mathematics , optics , combinatorics , metallurgy , fluorescence
Three crystalline forms (cubic, orthorhombic I and orthorhombic II) exist in the Na 2 O–Ca 3 Al 2 O 6 solid‐solution series at room temperature. A tetragonal form may be obtained by quenching. All the phases have lattices extremely close to the cubic form. The cubic and tetragonal varieties show no polymorphic transformations. The orthorhombic O I and O II phases become tetragonal at high temperature. There is complete agreement between the transition points revealed by X‐ray diffraction and microscopy. However, only the order–disorder O II → T transition is observed by μDTA.