Influence of atmospheric humidity on the symmetry and phase transitions of layered potassium oxyfluorides K 2 NbOF 5 · H 2 O
作者: S. V. MelnikovaN. M. Laptash
作者单位: 1Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences
2Institute of Chemistry, Far-Eastern Branch of the Russian Academy of Sciences
刊名: Physics of the Solid State, 2013, Vol.55 (6), pp.1231-1235
来源数据库: Springer Nature Journal
DOI: 10.1134/S1063783413060243
英文摘要: Abstract(#br)Crystals of K 2 NbOF 5 · H 2 O have been grown, polarization optical investigations have been performed, and the birefringence and rotation angle of the optical indicatrix have been measured in the temperature range 100–400 K. It has been found that, depending on the degree of atmospheric humidity, the layered K 2 NbOF 5 · H 2 O crystal at room temperature can be in three states, namely, A, B , and C , which differ in symmetry and properties of the crystal. The K 2 NbOF 5 · H 2 O crystal in the A state exists at a relative humidity RH = 90–100% and undergoes a first-order improper ferroelastic phase transition P $\bar 1$ ↔ C 2/ m , which is accompanied by strong anomalies of the optical characteristics, twinning, and shear strain x 6 at temperatures T 2 ↓ = 308 K and T 2 ↑ =...
全文获取路径: Springer Nature  (合作)
影响因子:0.769 (2012)

  • atmospheric 大气的
  • symmetry 对称
  • layered 成层的
  • humidity 湿度
  • potassium 
  • phase 相位