The following articles are a selection of those recently accepted for publication in Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials.
Melilite-like modulation and temperature-dependent evolution in the framework structure of K2Sc[Si2O6]F
This paper describes the crystal structure of synthetic K2Sc[Si2O6]F in superspace group P42/mnm(α,α,0)000s(-α,α,0)0000 with modulation wave vectors q1 = 0.2982(4)(a*+b*) and q2 = 0.2982(4)(-a*+b*). The structure is a mixed octahedral-tetrahedral framework composed of ScO4F2-octahedra, Si4O12-rings and K in variable coordination.
A novel polytype – the stacking fault based γ-MoO3 nanobelts
γ-MoO3 nanobelts were prepared by hydrothermal synthesis. The novel polytype crystal structure and morphology of the belts were studied by synchrotron radiation powder diffraction, scanning electron microscopy, transmission electron microscopy and selected area electron diffraction. Their nm dimensions, in particular in two crystallographic directions, have a profound influence on electrochemical properties during cycling as the cathode material in Li-coin cells. The crystal structure for the γ-MoO3 nanobelts differs significantly from that of bulk α-MoO3. The question of whether the disorder structure type of γ-MoO3 nanobelts is the main reason for the increased charge capacity of MoO3 nanobelts from 200 for bulk materials up to 340 mAh g−1 for nanobelt remains open.