(IUCr) Acta Crystallographica Section B Volume 47, Part 2, April 1991

Modulated structures

The theory of modulated structures and the study of such materials constitute an active and healthy field in crystallography. To view visualizations of over 60 modulated stuctures published in Acta Crystallographica Section B, click on the structure below.

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issue contents

April 1991 issue

lead articles

Diffraction investigation of the atomic structure of matter

research papers

Study of oxidation-state contrast in gallium dichloride by synchrotron X-ray anomalous scattering

High-resolution neutron powder diffraction studies of the structure of CsDSO₄

A modulation-wave approach to the structural description of the Nb₂Zr_x_–2O_2x+1 (x = 7.1–10.3) solid-solution field

Revised structure of Bi₃TiNbO₉

A framework for analysing relationships between chemical composition and crystal structure in metal oxides

Bond-valence parameters for solids

Aluminate sodalites: Sr₈[Al₁₂O₂₄](MoO₄)₂ (SAM) at 293, 423, 523, 623 and 723 K and Sr₈[Al₁₂O₂₄](WO₄)₂ (SAW) at 293 K

Structure of oxonium hexafluoroantimonate(V)

Sodium-ion distribution in Na⁺ β-alumina: a crystallographic challenge

A general sharing coefficient for the classification of structures with defined polyhedron complexes

A new example of an arrangement of antiphase domains: investigation by neutron diffraction of deuterated manganese fluosilicate

Structures and phase transition in the ferroelectric crystal of pentakis(methylammonium) undecachlorodibismuthate(III): [NH₃(CH₃)]₅Bi₂Cl₁₁

Structures of the 3:1 adducts of cadmium(II) bromide and of cadmium(II) chloride with 15-crown-5 ether: structural changes induced by radiation

Determination and restrained least-squares refinement of the structures of ribonuclease Sa and its complex with 3'-guanylic acid at 1.8 Å resolution

Electron distributions in peptides and related molecules. 1. An experimental and theoretical study of N-acetyl-L-tryptophan methylamide

Structure of an anti-arrhythmic and hypotensive agent: 1-[2-hydroxy-3-(4-phenyl-1-piperazinyl)propyl]pyrrolidin-2-one

Rotation barriers in crystals from diffraction studies: 2,2',4,4',6,6'-hexa-tert-butylazobenzene

X-ray powder diffraction studies of alkanes: unit-cell parameters of the homologous series C₁₈H₃₈ to C₂₈H₅₈

Conformational analysis of rotational barriers in N-arylpyrrolidin-2-ones

Crystal and molecular structures of overcrowded halogenated compounds. IX. Stereochemistry of molecules containing the perchlorofluorenyl and perchlorofluorenylidene moieties and of their hydrogen analogues

Deformation-density studies of thiathiophthenes. II. 2,4-diphenyl-6a-thiathiophthene

book reviews

Molecular structure of organosilicon compounds by E. Lukevics, O. Pudova and R. Sturkovich

Modulated structures

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