Growth mechanism of titanium monoxide TiO_xon a reduced calcium titanate CaTi₂O₄surface

Abstract

This paper presents an electron microscopy study of reduced calcium titanate crystals (CaTi2O4) and the growth mechanism of titanium monoxide TiOx on a CaTi2O4 surface. Large high‐quality CaTi2O4 crystals were prepared using the molten salt flux method. The crystallographic directions and the growth direction of the CaTi2O4 crystalline needles were confirmed by electron backscatter diffraction and Kikuchi pattern analysis. The low‐angle grain boundaries in CaTi2O4 and the crystallographic orientation relationship between CaTi2O4 and TiOx were investigated using high‐resolution transmission electron microscopy. It is found that both the low‐angle boundaries and the amorphous area may play a key role during the growth process of titanium monoxide TiOx. The results presented here contribute to a better understanding of the detailed growth mechanism of TiOx on a CaTi2O4 surface.

Hexagonal Phase Intergrown with the Tetragonal Weyl Semimetal TaAs

“…It is well-known that the physical properties of a material depend notably on the local structural properties. , The chiral Weyl fermions can appear in TaAs because the spin-doublet degeneracy of the bands is removed by breaking special inversion symmetry . In 1963, the arsenide TaAs crystallizes in the noncentrosymmetric space group I 4 1 md .…”