International Tables for Crystallography, Volume A1: Symmetry relations between space groups

Description

Volume A1 presents a systematic treatment of the maximal subgroups and minimal supergroups of the crystallographic plane groups and space groups. It is an extension of and a supplement to Volume A, Space-group symmetry, in which only basic data for sub- and supergroups are provided. Volume A1 consists of three parts: Part 1 presents an introduction to the theory of space groups at various levels and with many examples. It includes a chapter on the mathematical theory of subgroups. Part 2 gives for each plane group and space group a complete listing of all maximal subgroups and minimal supergroups. The treatment includes the generators of each subgroup as well as any necessary changes of the coordinate system. Maximal isomorphic subgroups are given in parameterized form as infinite series because of the infinite number for each group. Graphs that illustrate the group-subgroup relations are also presented. Part 3 lists the relations between the Wyckoff positions of every maximal subgroup of every space group. Again, the infinite number of maximal isomorphic subgroups of each space group are covered by parameterized series. Volume A1 is a valuable resource for scientists engaged in crystal-structure determination, crystal physics or crystal chemistry. It is essential for those interested in phase transitions, the systematic compilation of crystal structures, twinning phenomena and related fields of crystallographic research. The first edition of Volume A1 was reviewed by R. Gould (Crystallography News, No. 92, March 2005, p. 28). Contents Foreword Scope of this volume List of symbols and abbreviations used in this volume 1.1. Historical introduction 1.2. General introduction to the subgroups of space groups 1.3. Computer checking of the subgroup data 1.4. The mathematical background of the subgroup tables 1.5. Remarks on Wyckoff positions 1.6. Relating crystal structures by group–subgroup relations 1.7. The Bilbao Crystallographic Server 2.1. Guide to the subgroup tables and graphs 2.2. Tables of maximal subgroups of the plane groups 2.3. Tables of maximal subgroups of the space groups 2.4. Graphs for translationengleiche subgroups 2.5. Graphs for klassengleiche subgroups 3.1. Guide to the tables 3.2. Tables of the relations of the Wyckoff positions Appendix. Differences in the presentation of Parts 2 and 3 Subject index