STUDY OF POLYTYPIC PHASE RELATIONS AMONG COMPLEX INORGANIC STRUCTURES.
Abstract
Some polytypic relations between the naturally occurring phases hogbomite, nigerite, taaffeite and senaite are reviewed. In addition, nigerite is shown to have a unit cell with a and c equal, respectively, to 5.79 and 56.20 A. It has a substructure with the lattice type and approximate dimensions of the gahnite spinel structure on which nigerite occurs in oriented overgrowths. Twinning on pseudo-cubic symmetry elements further confirms the close relation between nigerite and gahnite. The polytypic relations among these several oxides are shown to be quite complex and to vary as a function of several compositional and/or structural variables. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0629438
Entities
People
- Donald R. Peacor
Organizations
- University of Michigan