Journal of the American Ceramic Society · 1963 · 79 citations · 4 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsPhase TransformationsSolid State PhysicsMetastable PhasesOrder-disorder TransformationsPhase EquilibriaPhase TransitionsSolid-state Phase TransformationsSolid-state Phase TransitionsCrystallographic Phase TransitionsDisorderMetastable Phase RelationsMetastable Phase TransitionsReconstructive Phase TransitionsSpinel OxidesSpinel StructureStructural Phase Transitions
LiAl 5 O 8 exists in many forms. The equilibrium high‐temperature form (I) has a spinel structure. It undergoes a first‐order reconstructive transformation at 1295°× 5°C to an equilibrium low‐temperature form (II) with primitive cubic symmetry, the unit edge changing from a 0 = 7.921 A (I) to a 0 = 7.907 A (II). In addition, a whole series of phases (II‐metastable) exist with the same symmetry as II but with a disorder different from I → II disorder.
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