ChemInform Abstract: Sodium Hydride as a Powerful Reducing Agent for Topotactic Oxide Deintercalation: Synthesis and Characterization of the Nickel(I) Oxide LaNiO2.
✍ Scribed by M. A. Hayward; M. A. Green; M. J. Rosseinsky; J. Sloan
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 37 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Sodium Hydride as a Powerful Reducing Agent for Topotactic Oxide Deintercalation: Synthesis and Characterization of the Nickel(I) Oxide LaNiO 2 . -Solid NaH serves as a novel reducing agent in the topotactic reduction of the Ni III perovskite oxide LaNiO 3 to the metastable Ni I phase LaNiO 2 (190-210 • C, evacuated Pyrex tube). A new tetragonal infinite-layer compound, NdNiO 2+x , is prepared by reduction of NdNiO 3 with NaH in the temp. range 160-210 • C. The LaNiO 2 phase crystallizes in the tetragonal space group P4/mmm. The simple infinite-layer model has to be significantly modified by a novel defect structure in which additional oxide ions are present in the space between the NiO 2 3-layers and produce both four-coordinate square-planar and five-coordinate square-pyramidal environments for Ni. -(