Department of Physical Sciences, Indian Institute of Science Education and Research-Kolkata, Nadia, India.
J Phys Condens Matter. 2011 Sep 14;23(36):365401. doi: 10.1088/0953-8984/23/36/365401. Epub 2011 Aug 22.
High pressure x-ray diffraction and Raman spectroscopy studies have been carried out on non-stoichiometric sodium tungsten bronze, Na(0.025)WO(3). The high pressure investigations reveal a phase transition at about 2 GPa by a change of space group symmetry from P2(1)/n to P2(1)/c in the monoclinic cell followed by a second structural transformation to a triclinic lattice around 18 GPa. There are volume changes with these structural transformations, which are driven by rotation and significant distortion of WO(6) octahedra due to the displacement of tungsten and oxygen atoms from their mean positions in the unit cell.
高压 X 射线衍射和拉曼光谱研究已经在非化学计量的钠钨青铜 Na(0.025)WO(3)上进行。高压研究表明，在大约 2 GPa 时发生了一个相转变，由单斜晶胞的空间群对称性从 P2(1)/n 转变为 P2(1)/c，随后在大约 18 GPa 时发生了第二个结构转变为三斜晶格。这些结构转变伴随着体积变化，这是由于钨和氧原子从其在晶胞中的平均位置位移引起的 WO(6)八面体的旋转和显著变形所驱动的。
