`β-Tungsten' as a tungsten oxide

Abstract

The existence of 'fl-W' as a modification of tungsten is contradicted by the low density of the phase and by its decomposition into W and WO,. at about 700°C. It is assumed that 'fl-W' is a metallic tungsten oxide with the probable ideal formula W30. The unit cell would then contain 6 W+20 atoms distributed at random over the eight positions of the A15 structure.

Single‐Step Synthesis and Surface‐Assisted Growth of Superconducting TaS2 Nanowires

“…However, careful analysis of this and further SAED patterns, such as that shown in the inset to Figure 3 d, which approaches a [21 1 0] projection, yields a more precise match to 2H-TaS 2 than to 1T-TaS 2 . The 3R and less-common 6R polytypes [9,17] were also considered, but neither provided an acceptable match to the SAED data. Therefore, the SAED data are consistent with the predominant phase of the nanowires being 2H-TaS 2 .…”

Thermodynamic assessment of the Co–Fe–Sb system

“…Refs. [31,39,40,45] The solid solubility of Sb in α(A2) is 3 at% Sb at low temperature reported by Hägg [39,40] and 3.8 at% Sb at 1261 K by Geller [33].…”

“…[31,32,[37][38][39][40][41][42][43][44] showed that the homogeneity range of β (FeSb) is shifted to higher Sb contents with decreasing temperature. Refs.…”

Supramolecular Self‐Organization of “Janus‐like” Diblock Codendrimers: Synthesis, Thermal Behavior, and Phase Structure Modeling

“…Still under debate, [45] the structure of the Pm3 n micellar cubic phase is thought to be made of two types of micelles: two quasispherical ones are located at the corners and center of the cubic lattice, and six with a more flattened shape are positioned in the middle of the faces. [46] This latter structure was proposed after the so-called A15 [47] structure known in metal alloys (MM' 3 ) and metal oxides (MO 3 ). In this case, the atoms M generate a cubic body-centered substructure (i.e., Im3 m symmetry), and each of the cubic faces contains a pair of the M' or O atoms located on two of the four tetrahedral sites, leading to breaking up of the symmetry.…”