DIRECT SOLUTION OF COMPLEX CRYSTAL STRUCTURES BY ELECTRON MICROSCOPY,
Abstract
Hexagonal ferrites, complex ferrimagnetic oxides having exploitable microwave/millimeter-wave properties, form structures too large and complex for solution by classical diffraction techniques. Determination of crystal structures, however, is essential for a structural understanding of properties and for attaining the ultimate objective of tailor-made materials in thi frequency range. The procedure described herein uses high-resolution replica electron microscopy to 'read out' structural stacking sequences 'encoded' onto hexagonal ferrite crystal surfaces by hydrochloric and, particularly, nitric acid etching. The method readily permits the direct solution of such crystal structures, including materials with larger unit cells than in any known inorganic substances. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0713554
Entities
People
- Charles F. Cook Jr.
- Donald W. Eckart
- Jack A. Kohn
Organizations
- United States Army Communications-Electronics Command