Construction of a double-layered tetrahedral network within a perovskite host: Two-step route to the alkali-metal-halide layered perovskite, (LixCl)LaNb2O7

✍ Scribed by Liliana Viciu; Thomas A. Kodenkandath; John B. Wiley

• Book ID: 104029792
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 911 KB
• Volume: 180
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.11.014

✦ Synopsis

A two-step topotactic route is used to construct lithium halide layers within a perovskite host. Initially RbLaNb 2 O 7 is converted to (CuCl)LaNb 2 O 7 by ion exchange and then reductive intercalation with n-butyllithium is used to form (Li x Cl)LaNb 2 O 7 . The copper metal byproduct from the reduction step is removed by treatment with iodine. Rietveld refinement of neutron powder diffraction data revealed that an alkali-halide double layer with LiO 2 Cl 2 tetrahedra forms between the perovskite slabs. Compositional studies indicate that the range for x in (Li x Cl)LaNb 2 O 7 is 2pxo4, which appears consistent with the neutron data where only one lithium site was found in the structure.