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By D. W. Budworth and G. Arthur (Auth.)

ISBN-10: 0080160964

ISBN-13: 9780080160962

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O®®® 1 4,8 6 4,8 Τβ A 4,8 6 6 A 4,8 J4,8 Ιβ Upper half cell I Octahedral sites occupied A Tetrahedral sites occupied ( ^ J Oxygen F L·^e- t^* B cubelet FIG. 9. Normal spinel, (a) Plans of the upper and lower halves of the unit cell. ) (b) Arrangement of cubelets. (c) Contents of A and B cubelets. 58 An Introduction to Ceramic Science Fe 2 0 3 ), and the chromites (based on Cr 2 0 3 ). The divalent ion can be Mg, Fe, Zn, Mn, Ni, Cu, Co or others.

Unit cell of perovskite. 10. THE ILMENITE STRUCTURE In ilmenite, FeTi0 3 , the iron ion is too small to form a closepacked array with the oxygen ions, and the structure adopted is similar to that of corundum, except that the octahedral interstices are occupied by two species of ion instead of one. The ilmenite structure is adopted by MgTi03, CoTi0 3 , NiTi0 3 , and other compounds. 11. Al203) has given its name to a structure which is of frequent occurrence and 56 An Introduction to Ceramic Science considerable importance in ceramics.

This description is undoubtedly correct as far as the positions of the centres of the ions are concerned but, as the fluorine ions are larger than the calcium ions, the first description given here seems more realistic. The radius ratio, at about 0*71, is just about right for the cations to fit into the cubic interstices. 50 An Introduction to Ceramic Science • Ca o FIG. 6. Unit cell of fluorite. The eightfold coordination of two of the four calcium ions in the unit cell is shown. The two types of ion are obviously not in equivalent arrangements in this structure, and the coordination is 8:4, each calcium ion being surrounded by 8 fluorine ions, and each fluorine ion by 4 calcium ions.

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An Introduction to Ceramic Science by D. W. Budworth and G. Arthur (Auth.)

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