Zobrazeno 1 - 10
of 57
pro vyhledávání: '"P. M. de Wolff"'
Publikováno v:
International Tables for Crystallography ISBN: 9780470974230
The effect of the special conditions. Border lines of type-I and type-II regions are drawn as heavy lines if included. Type-I and type-II regions are marked as in Fig. 3.1.3.1. belongs to the type-II region. A heavy border line of a region stops shor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3d1b90a2d7c6b7023a1911d8621cd50
https://doi.org/10.1107/97809553602060000929
https://doi.org/10.1107/97809553602060000929
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 84:821-827
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be154704b55d15a96d1a42a3e40e73f2
https://doi.org/10.1002/recl.19650840702
https://doi.org/10.1002/recl.19650840702
Autor:
B. Gruber, P. M. de Wolff
Publikováno v:
Acta Crystallographica Section A Foundations of Crystallography. 47:29-36
An exact definition of the 44 lattice characters listed by Niggli is thoroughly discussed and is elucidated by examples. In order to represent the characters graphically, use is made of the projection of the Niggli-reduced basis vector c on the a, b
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https://explore.openaire.eu/search/publication?articleId=doi_________::33f0933162620b7ac4f376a747243932
https://doi.org/10.1107/s0108767390009485
https://doi.org/10.1107/s0108767390009485
Autor:
Y. Amemiya, U. W. Arndt, B. Buras, J. Chikawa, L. Gerward, J. I. Langford, W. Parrish, P. M. de Wolff
Publikováno v:
International Tables for Crystallography ISBN: 9781402019005
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62944e7e839e5f6adbf2bfc896785750
https://doi.org/10.1107/97809553602060000604
https://doi.org/10.1107/97809553602060000604
Publikováno v:
International Tables for Crystallography ISBN: 9781402019005
International Tables for Crystallography
International Tables for Crystallography
This chapter discusses incommensurate and commensurate modulated structures. After an introduction to the concepts used to describe modulated structures, including the basic ideas of higher-dimensional crystallography, four-dimensional space groups a
Externí odkaz:
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https://doi.org/10.1107/97809553602060000624
https://doi.org/10.1107/97809553602060000624
Autor:
P. M. de Wolff
Publikováno v:
International Tables for Crystallography ISBN: 9780792365907
In this chapter, reduced bases (reduced cells) are described. The treatment starts with the definition of the reduced basis and the reduced form in terms of the metric tensor and lists the conditions (both main and special) for reduced bases of type-
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https://doi.org/10.1107/97809553602060000518
https://doi.org/10.1107/97809553602060000518
Autor:
P. M. de Wolff
Publikováno v:
Acta Crystallographica Section A. 33:493-497
Displacive modulation is defined as periodic distortion with an incommensurable k vector. If the phase of the distortion is t, a symmetry operation can be expressed as a normal space-group operation combined with a sign reversal and/or a shift in the
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https://doi.org/10.1107/s0567739477001223
https://doi.org/10.1107/s0567739477001223
Publikováno v:
Acta Crystallographica Section A. 37:625-636
A complete list of (3 + 1)-dimensional superspace groups is presented. These groups describe the symmetry of incommensurate crystal structures with a one-dimensional modulation. A short discussion is given of applications. Extinction rules and Bravai
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https://doi.org/10.1107/s0567739481001447
https://doi.org/10.1107/s0567739481001447
Publikováno v:
Acta Crystallographica Section A Foundations of Crystallography. 39:667-670
Wyckoff positions of centrosymmetric symmorphic space groups, if properly interpreted, can be used to derive the Bravais classes of modulated crystals. This program is worked out here for the incommensurate case and assuming that the modulation wave
Externí odkaz:
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https://doi.org/10.1107/s010876738300135x
https://doi.org/10.1107/s010876738300135x
Publikováno v:
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 32:47-58
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dfa6771688b7dcab4f902c94205b88fc
https://doi.org/10.1107/s056774087600229x
https://doi.org/10.1107/s056774087600229x