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Six angles are formed between four straight lines meeting at a point in space. Since there is one relationship between them. only certain combinations of six regular polygons will fit together at such a point. Some of these are enumerated.
By measuring the birefringence on (001) platelets of PAMC as a function of temperature, previously determined phase transitions have been confirmed. Large effects were measured on passing through the normal-incommensurate transition and through the normal-commensurate transition, whereas the...
The anomalous scattering terms f' and f'' for Gd and Sm near their L3 absorption edges, measured in diffraction experiments with synchrotron radiation more nearly monochromatic than the natural level widths, show even larger effects than earlier measurements with a larger X-ray bandwidth. A test...
The electronic state of the O2- ion in MgO is studied in detail by measuring the isotropic Compton profile and profiles in crystal directions 100, 110, and 111. The theoretical profiles are calculated using linear combinations of local orbitals orthogonalized to each other symmetrically. The...
An efficient computer procedure has been developed for the extraction of regions of contiguous, well-connected high density from a three-dimensional electron-density map. This procedure may be used to generate an extended model volume, from a smaller volume based on a starting atomic model. The...
The modulated structure of the NC-type pyrrhotite Fe1 - xS with x = 0.09 has been determined. The analysis is based on a four-dimensional space group, Wpna21qq1, and an anharmonic modulation model with 53 positional, two thermal, and eight occupational parameters including up to fourth-order...
A method is presented in which parameters obtained from vibrational spectroscopy are used in the least-squares refinement of positional and thermal parameters obtained from diffraction data. The method involves the calculation of those contributions to the temperature factors not well described...
The present paper is the continuation of another devoted to the theoretical aspects of lattice-row and lattice-plane preservation in the isomorphic subgroups of space group P1. In the present paper the lattice preservation is studied as a function of the values of row indices U,V,W and plane...
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