Preview: Forthcoming article in Acta Crystallographica Section B: Structural Science
Forthcoming article in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their
Sr1/2Ce5/14□1/7WO4: a new modulated ternary scheelite compound
A new ternary scheelite tungstate (Sr, Ce)WO4 phase was synthesized, with a two-dimensional incommensurately modulated structure linked to partial ordering of Sr and Ce cations and vacancies as seen using high-resolution electron microscopy. A band gap of 3.2 eV makes it a promising violet-emitting compound.
Die Symmetrie von Spiralketten
The relationship between the chemical designation for helical polymeric molecules and the corresponding Hermann–Mauguin rod group symbols is analyzed, including interlocked multiple helices and helices of joined coordination polyhedra. The crystallographic rod subgroups of non-crystallographic rod groups are given.
Identification of a deleterious phase in photocatalyst based on Cd1 − xZnxS/Zn(OH)2 by simulated XRD patterns
The X-ray diffraction (XRD) pattern of a deleterious phase in the photocatalyst based on Cd1 − xZnxS/Zn(OH)2 contains two relatively intensive asymmetric peaks with d-spacings of 2.72 and 1.56 Å. Very small diffraction peaks with interplanar distances of (d) ≃ 8.01, 5.40, 4.09, 3.15, 2.49 and 1.35 Å are characteristic of this phase but not always observed. To identify this phase, the XRD patterns were calculated for three models: sheet-like β-Zn(OH)2, sheet-like hydrozincite, Zn5(CO3)2(OH)6, and turbostratic hydrozincite. Simulations revealed the formation of nanocrystalline turbostratic hydrozincite-like phase. It was shown that this phase decomposes into ZnO in air above 473 K.
Ordered vacancy distribution in 2/1 mullite: a superspace model
A superspace model with complete vacancy ordering is presented based on X-ray diffraction of a 2/1 mullite sample with sharp satellite reflections. The results allow different conclusions of previous investigations of the last decades to be consolidated.