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NH4IO3 shows an abrupt contraction in the direction of spontaneous polarization at 82DegreesC. This anomaly is accompanied by changes in the optical properties and phonon spectra, which were also studied at different pressures. On the basis of the lattice parameters and Raman spectra a probable...
Starting from space groups, the point groups of which are cyclic, all the other space groups are deduced. The inductive method used is known to provide the 32 point groups, starting with the cyclic groups. It is applied to the derivation of magnetic point and space groups.
The origin peak in the Patterson function may be used to construct E values when the number and type of the atoms in the structure are known. This is illustrated by an example leading to an agreement value between the observed and calculated E values of 0.170. For comparison, a least-squares...
A simple technique is described for ascertaining trial models for the structures of perovskites. The method relies on an understanding of the fundamental components of the structure. Rules are given for determining trial models rapidly.
It is shown that with the small amount of data available in the neutron powder diffraction method, it is possible, by means of reasonable constraints, to refine a molecular structure involving a large number of atoms. The method has been used to refine the crystal structure of perfluorodiphenyl....
The reduction of crystals of Nb12O29, having an excess of oxygen, has been studied by high-resolution electron microscopy and electron diffraction. A superstructure and faulted slabs are formed, by aggregation of the point defects forming chains with a limited length in the matrix structure,...
Symmetry rules are derived for relating the convergent-beam electron-diffraction pattern symmetries to the three-dimensional symmetry of the structure. These rules are applied to a study of 2M biotite. As a result the space group is determined as C2, or number 5 in International Tables for X-ray...
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