Single crystal structure determination of double layered strontium iridium oxide [Sr3Ir2O7]
Single crystal structure determination of double layered strontium iridium oxide [Sr3Ir2O7]
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DOI：
10.1016/0025-5408(94)90120-1
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发表时间：
1994-06
影响因子：
5.4
通讯作者：
M. A. Subramanian;M. Crawford;R. Harlow
中科院分区：
文献类型：
--
作者：
M. A. Subramanian;M. Crawford;R. Harlow
摘要 首次在环境压力下在密封Pt 管中使用SrO 2 和IrO 2 从SrCl 2 熔剂中生长Sr 3 Ir 2 O 7 单晶。该化合物结晶为四方晶胞[a= 3.896 (1) and c= 20.879 (3) Å]，空间群为I4/mmm（No. 139），Z= 2。通过单晶X射线衍射解析晶体结构，并精修至R= 0.014。结构精修表明，IrO 6 八面体绕 c 轴旋转约 12 度，类似于最近在 Sr 2 IrO 4 中发现的旋转畸变。然而，与 Sr 2 IrO 4 不同，Sr 3 Ir 2 O 7 中的 IrO 6 旋转不相关，因此没有出现超晶格反射。
Abstract Single crystals of Sr 3 Ir 2 O 7 were grown for the first time from a SrCl 2 flux using SrO 2 and IrO 2 in a sealed Pt tube under ambient pressure. The compound crystallizes in a tetragonal unit cell [a= 3.896 (1) and c= 20.879 (3) A ̊] with space group I4/mmm (No. 139) and Z= 2. The crystal structure was solved by means of single crystal X-ray diffraction and refined to R= 0.014. The structural refinement showed that the IrO 6 octahedra are rotated about the c-axis by about 12 degrees, similar to the rotational distortion recently found in Sr 2 IrO 4. However, unlike in Sr 2 IrO 4, the IrO 6 rotations in Sr 3 Ir 2 O 7 are not correlated, hence no superlattice reflections appear.