Accession Number : AD0750608

Title :   Magnetic Ordering in Lithium-Transition Metal Oxides with Ordered Rocksalt Structures.

Descriptive Note : Research and development technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Tauber,A.

Report Date : AUG 1972

Pagination or Media Count : 149

Abstract : TIES), CHROMIUM COMPOUNDS, NICKEL COMPOUNDS, MANGANESE COMPOUNDS, IRON OXIDES, CRYSTAL STRUCTURE, SOLID SOLUTIONS, THESES, ANTIFERROMAGNETISM, OXIDES*MAGNETIC ORDERING, MAGNETIC SUSCEPTIBILITY, MAGNONS, MANGANESE OXIDES, MOLECULAR FIELD THEORY, NICKEL OXIDES, CHROMIUM OXIDESA better understanding of the nature and mechanisms of superexchange is sought by studying magnetic ordering in compounds isotypic with alpha-NaFeO2. Exchange, superexchange, and Weiss molecular field theory are reviewed. The Heisenberg-Dirac-Van Vleck Hamiltonian is derived by an intuitive method. The historic development of superexchange in terms of quantitative theory and qualitative rules is considered. The Weiss molecular field theory is used to compute the exchange parameters. Its advantages, limitations and predictions are stated and the several expressions employed are developed. The crystal chemistry and some physical properties of ordered rocksalts isotypic with alpha-NaFeO2 are analyzed. (Author)

Descriptors :   (*LITHIUM COMPOUNDS, MAGNETIC PROPERTIES), CHROMIUM COMPOUNDS, NICKEL COMPOUNDS, MANGANESE COMPOUNDS, IRON OXIDES, CRYSTAL STRUCTURE, SOLID SOLUTIONS, THESES, ANTIFERROMAGNETISM, OXIDES

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE