On the Phase Transition of Tungsten Trioxide below Room Temperature
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Microscopic observation, thermal analysis, measurement of electrical resistivity and X-ray study of WO_3 were carried out in relation to the phase transition from room temperature down to -70℃. The crystal of WO_3 is monoclinic (α = 7.30Å, b = 7.53Å, c = 7.68Å, β = 90°54') at room temperature, and it transforms to triclinic (α = 7.30Å, b = 7.52Å, c = 7.69Å, α = 88°50', β = 90°55', γ = 90°56') near 17℃, and transforms to monoclinic (α = 5.27Å, b = 5.16Å, c = 7.67Å, β = 91°43') near -40℃, on cooling. These two transitions could be clearly observed in the single-domain crystal in the room temperature phase, but the phase transitions of complicated appearance were observed in the multidomain crystal owing to a small difference between free energies in the room-temperature phase and the triclinic phase. Both electrical resistivity versus temperature curve and thermal differential curve show a slight anomaly at 17℃ transition and a remarkable anomaly at -40℃ transition.
- 社団法人日本物理学会の論文
- 1960-04-05
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