The PTOT system and the notation presented are important in teaching crystal structures in any area concerned with such structures and with solid state applications. The spacing is also quite regular, determined by the geometry of octahedra and tetrahedra. However, none has recognized that there is a general scheme involving packing (P), octahedral (O), and tetrahedral (T) sites occurring in layers, in the sequence PTOT. 9 8 7 6 5 4 3 2 1 īooks on crystal structures have long recognized the importance of close packing in many crystal structures and the roles of tetrahedral and octahedral sites in such structures are well known. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.
Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer ScienceþBusiness Media, Inc., 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. ß 2006 Springer ScienceþBusiness Media, Inc. Douglas Shih-Ming Ho University of Pittsburgh Pittsburgh, PA USA Structure and Chemistry of Crystalline Solidsīodie E.
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