title: High-Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order.
abstract: The high-pressure synthesis of a manganese oxyhydride LaSrMnO3.3 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 (Mn(2+) -Mn(3+) ) and antiferromagnetic (Mn(2+) -Mn(2) , Mn(3+) -Mn(3+) ) interactions.
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Cedric
authors.initials: C
authors.lastname: Tassel
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Goto
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Daichi
authors.initials: D
authors.lastname: Watabe
authors.forename: Ya
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Honcheng
authors.initials: H
authors.lastname: Lu
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kuno
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Takeiri
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
authors.forename: Craig M
authors.initials: CM
authors.lastname: Brown
authors.affiliation: Bragg Institute, Australian Nuclear Science and Technology Organization (ANSTO), Locked Bag 2001, Kirrawee, DC NSW, 2232, Australia.
authors.forename: James
authors.initials: J
authors.lastname: Hester
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan.
authors.forename: Yoji
authors.initials: Y
authors.lastname: Kobayashi
authors.affiliation: Graduate School of Engineering, Kyoto University, 615-8510, Kyoto, Japan. kage@scl.kyoto-u.ac.jp.
authors.forename: Hiroshi
authors.identifier: 0000-0002-3911-9864
authors.initials: H
authors.lastname: Kageyama
keywords: Ruddlesden-Popper perovskites; anion order; mixed-anion compounds; oxyhydrides; solid-state structures