Ferrite coordination number

Cubed compound, in PVC siding manufacture, 25 685 Cube lattice, 8 114t Cubic boron nitride, 1 8 4 654 grinding wheels, 1 21 hardness in various scales, l 3t physical properties of, 4 653t Cubic close-packed (CCP) structure, of spinel ferrites, 11 60 Cubic ferrites, 11 55-57 Cubic geometry, for metal coordination numbers, 7 574, 575t. See also Cubic structure Cubic symmetry Cubic silsesquioxanes (CSS), 13 539 Cubic structure, of ferroelectric crystals, 11 94-95, 96 Cubic symmetry, 8 114t Cubitron sol-gel abrasives, 1 7 Cucurbituril inclusion compounds,... 

The ordering pattern of oxygen vacancies found in browmnillerite, resulting in chains of apex-linked tetrahedra, can be supplemented by arrangements in which the coordination polyhedra formed are BO square pyramids. There are large numbers of these stmctures known within the manganites, ferrites and cobaltites, and only representative examples are illustrated here. 

A number of structures exist which are not directly related to calcium ferrite but which consists of similar coordination polyhedra. The first of these is the RMn20j structure type shown in fig. 28.51. This structure has been found for R = La through Lu by Quezel-Ambrunaz et al. (1964). The orthorhombic unit cell of this phase belongs to space group Pbam and for HoMn20s has parameters a = 136A, b = 8.49A, c = 5.69A. Atom positions for this compound are ... 

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