High‐Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order

• DOI: 10.1002/anie.201605123
• Publication Date: 2016-06-29T21:26:09Z
• Authors: Cedric Tassel; Yoshinori Goto; Daichi Watabe; Ya Tang; Honcheng Lu; Yoshinori Kuno; Fumitaka Takeiri; Takafumi Yamamoto; Craig M. Brown; James Hester; Yoji Kobayashi; Hiroshi Kageyama
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

AbstractThe high‐pressure synthesis of a manganese oxyhydride LaSrMnO3.3H0.7 is reported. Neutron and X‐ray Rietveld analyses showed that this compound adopts the K2NiF4 structure with hydride ions positioned exclusively at the equatorial site. This result makes a striking contrast to topochemical reductions of LaSrMnO4 that result in only oxygen‐deficient phases down to LaSrMnO3.5. This suggests that high H2 pressure plays a key role in stabilizing the oxyhydride phase, offering an opportunity to synthesize other transition‐metal oxyhydrides. Magnetic susceptibility revealed a spin‐glass transition at 24 K that is due to competing ferromagnetic (Mn2+–Mn3+) and antiferromagnetic (Mn2+–Mn2, Mn3+–Mn3+) interactions.