Regular Pattern of Tungsten Trioxide Phase Change

Structure of tungsten trioxide can well be described as a common apex WO6 octahedron three-dimensional network structure. However WO3 symmetry relatively quite low because it is a modification by ReO3 ideal structure, embodied in WO6 octahedra tilt and tungsten atoms replacing the central position of the octahedron. The various change of phonon lattice and electronic structure let tungsten trioxide produced several crystalline phase, these types of crystalline phases with increasing temperature is evolved from the low to the high symmetry change.

After the studies, now researchers get more recognized tungsten trioxide phase change order: monoclinic Pc (ε-WO3) → triclinic PT (ζ-WO3) → monoclinic P21 / n (λ-WO3) → orthogonal Pbcn (β-WO3) → Quartet P4 / ncc (α-WO3) → P4 / nmm. In 2002, after continuous research, found new crystalline phase. Also through high resolution neutron powder diffraction method confirmed the existence of a new phase in the monoclinic temperature zone of 720 ℃ to 790 ℃.

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