An Anti CuO₂‐type Metal Hydride Square Net Structure in Ln₂M₂As₂H_x (Ln=La or Sm, M=Ti, V, Cr, or Mn)

Abstract

Using a high pressure technique and the strong donating nature of H(-), a new series of tetragonal La2Fe2Se2O3-type layered mixed-anion arsenides, Ln2M2As2H(x), was synthesized (Ln=La or Sm, M=Ti, V, Cr, or Mn; x≈3). In these compounds, an unusual M2H square net, which has anti CuO2 square net structures accompanying two As(3-) ions, is sandwiched by (LaH)2 fluorite layers. Notably, strong metal-metal bonding with a distance of 2.80 Å was confirmed in La2Ti2As2H2.3, which has metallic properties. In fact, these compounds are situated near the boundary between salt-like ionic hydrides and transition-metal hydrides with metallic characters.

Hydrogenation studies on NdScSi and NdScGe

“…The other interstitial site filled by hydrogen (or deuterium) is located in the Sc 4/2 Nd 2 octahedron. This position has been observed in the homologous phases La 2 Ti 2 As 2 H 2.3 [40],T i 2 SbD 0.5 [41] Intensity (a. u.)…”

Titanium Pnictide Oxide Superconductors

“…Recently, various ATi2Pn2O-related compounds, such as pnictide oxides and chalcogenide oxides, have been found [60][61][62][63][64]. For instance, Ba2Ti2Fe2As4O is an intergrowth of BaTi2As2O and BaFe2As2 where TDW of 120 K is observed, which is lower than that in BaTi2As2O due to the interlayer charge transfer [60].…”

Japan‐Preis: H. Hosono / Asahi‐Preis: S. Murai / Merck–Banyu Lectureship Award: S. Maeda

“…Mit diesem mit 50 Million Yen verbundenen Preis werden international geschätzte Wissenschaftler und Ingenieure für Arbeiten gewürdigt, die zu Frieden und Wohlstand der Menschheit beigetragen haben. 2016 geht der Preis an Steven D. Tanksley (Cornell University) und Hideo Hosono (Technische Hochschule Tokio), der Coautor von Arbeiten in der Angewandten Chemie über tetragonale gemischtanionische Schichtarsenide und in Advanced Energy Materials über gemischtvalente Zinnoxide ist. Hosono studierte an der Metropolischen Universität Tokio und promovierte dort 1982 bei Takafumi Kanazawa und Hiroshi Kawazoe.…”