Foundations of Crystallography

 

Acta Cryst. (1999). A55, 975-983  [ doi:10.1107/S0108767399006224 ]

Indexing approximants of icosahedral quasicrystals

M. Quiquandon, A. Katz, F. Puyraimond and D. Gratias

Synopsis: A method is derived from indexing the diffraction patterns of approximant structures from the N-dimensional indexing of the parent quasicrystal. Examples are given for the case of the approximant of the icosahedral phases with special emphasis on the origin of the so-called `systematic accidental' extinctions observed in pentagonal phases.

Online November 1999

 

Acta Cryst. (1999). A55, 984-990  [ doi:10.1107/S010876739900690X ]

The joint probability distribution function of structure factors with rational indices. VI. Cases with reduced dimensionality

C. Giacovazzo, D. Siliqi, C. Fernández-Castaño, G. L. Cascarano and B. Carrozzini

Synopsis: Probabilistic formulas for estimating structure factors with indices of mixed type (some are integers and some half-integers) are given. The concept of `quasi-invariant' is fixed.

Online November 1999

 

Acta Cryst. (1999). A55, 991-999  [ doi:10.1107/S0108767399007205 ]

SIR99, a program for the automatic solution of small and large crystal structures

M. C. Burla, M. Camalli, B. Carrozzini, G. L. Cascarano, C. Giacovazzo, G. Polidori and R. Spagna

Synopsis: The program SIR99 is a versatile tool for direct solution and complete refinement of small and large crystal structures.

Online November 1999

 

Acta Cryst. (1999). A55, 1000-1013  [ doi:10.1107/S0108767399007667 ]

X-ray intensity patterns from finite perfect crystals

G. Thorkildsen and H. B. Larsen

Synopsis: X-ray interference patterns from a finite perfect crystal have been studied theoretically using diamond as a model system.

Online November 1999

 

Acta Cryst. (1999). A55, 1014-1025  [ doi:10.1107/S0108767399007114 ]

Lattice dynamics and Debye-Waller factors of some compounds with the sodium chloride structure

H. X. Gao, L.-M. Peng and J. M. Zuo

Synopsis: Debye-Waller factors for 19 compounds with the sodium chloride structure are given over a temperature range from 1 to 1000  K where appropriate.

Online November 1999

 

Acta Cryst. (1999). A55, 1026-1033  [ doi:10.1107/S0108767399011125 ]

Anisotropic dispersion of the band structure and formation of ring patterns in CBED

L.-M. Peng and J. M. Zuo

Synopsis: An off-axis ring pattern was observed in the <> zone-axis CBED pattern of NiO, and the pattern was interpreted using a two-Bloch-wave approximation.

Online November 1999

 

Acta Cryst. (1999). A55, 1034-1037  [ doi:10.1107/S0108767399009782 ]

Experimental determination of electric-field-induced differences in structure-factor phases of the order of 2%

J. Stahn, A. Pucher, U. Pietsch, J. Zellner and E. Weckert

Synopsis: The change of structure-factor phases of several weak reflections of GaAs has been measured by three-beam interferences. Using a modulation technique, phase variations of the order of 1° for a field strength of 1  kV  mm^-1 were determined.

Online November 1999

 

Acta Cryst. (1999). A55, 1038-1048  [ doi:10.1107/S010876739900464X ]

Electron density in ammonium dihydrogen phosphate: non-uniqueness of the multipolar model in simple inorganic structures

N. Pérès, A. Boukhris, M. Souhassou, G. Gavoille and C. Lecomte

Synopsis: Non-uniqueness of the multipole refinement of the electron density in ammonium dihydrogen phosphate and consequences on the topology of the electron density.

Online November 1999

 

Acta Cryst. (1999). A55, 1049-1060  [ doi:10.1107/S0108767399010272 ]

Algebraic expressions for symmetry-adapted functions of the icosahedral group in spinor space

P.-D. Fan, J.-Q. Chen and J. P. Draayer

Synopsis: Algebraic expressions for projection operators and symmetry-adapted functions (SAFs) of the icosahedral group for spinor (double-valued) representations are found by using the double-induced technique and eigenfunction method.

Online November 1999

 

Acta Cryst. (1999). A55, 1061  [ doi:10.1107/S0108767399012015 ]

Dynamical scattering and electron diffraction from thin polymer lamellar crystals - poly(tert-butylethylene sulfide). Erratum

D. L. Dorset, P. Dumas, L. Cartier and B. Lotz

Synopsis: Erratum to Acta Cryst. (1999), A55, 901-907.

Online November 1999

 

Acta Cryst. (1999). A55, 1062  [ doi:10.1107/S0108767399011939 ]

Physics of crystal growth

Online November 1999

 

Acta Cryst. (1999). A55, 1063-1064  [ doi:10.1107/S0108767399012106 ]

Prices of IUCr journals

Online November 1999