1. High-Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order.
- Author
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Tassel, Cedric, Goto, Yoshinori, Watabe, Daichi, Tang, Ya, Lu, Honcheng, Kuno, Yoshinori, Takeiri, Fumitaka, Yamamoto, Takafumi, Brown, Craig M., Hester, James, Kobayashi, Yoji, and Kageyama, Hiroshi
- Subjects
MANGANESE ,NEUTRONS ,X-ray (Aboriginal Australian art style) ,ANTIFERROMAGNETIC materials ,OXYGEN reduction - Abstract
The high-pressure synthesis of a manganese oxyhydride LaSrMnO
3.3 H0.7 is reported. Neutron and X-ray Rietveld analyses showed that this compound adopts the K2 NiF4 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. [ABSTRACT FROM AUTHOR]- Published
- 2016
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