Direct Synthesis of Chromium Perovskite Oxyhydride with a High Magnetic‐Transition Temperature1. (12th August 2014)

• Record Type: Journal Article
• Authors: Tassel, Cédric; Goto, Yoshihiro; Kuno, Yoshinori; Hester, James; Green, Mark; Kobayashi, Yoji; Kageyama, Hiroshi
• Is Part Of: Angewandte Chemie. Volume 126:Number 39(2014)
• Page Start: 10545
• Page End: 10548
• Publication Date: 2014-08-12
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201405453
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We report a novel oxyhydride SrCrO₂H directly synthesized by a high‐pressure high‐temperature method. Powder neutron and synchrotron X‐ray diffraction revealed that this compound adopts the ideal cubic perovskite structure <inline-formula><alternatives><tex-math notation="tex"><![CDATA[${\left( {Pm\bar 3m} \right)}$]]></tex-math><inline-graphic xlink:href="ark:/27927/pgh1c9nv027" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></alternatives></inline-formula> with O²⁻/H⁻ disorder. Surprisingly, despite the non‐bonding nature between Cr 3d t_2g orbitals and the H 1s orbital, it exhibits G‐type spin ordering at T_N≈380 K, which is higher than that of RCrO₃ (R=rare earth) and any chromium oxides. The enhanced <italic>T</italic>_N in SrCrO₂H with four Cr‐O‐Cr bonds in comparison with RCr³⁺O₃ with six Cr‐O‐Cr bonds is reasonably explained by the tolerance factor. The present result offers an effective strategy to tune octahedral tilting in perovskites and to improve physical and chemical properties through mixed anion chemistry.</p> </abstract>