High‐Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order

Tassel, Cédric; Goto, Yoshihiro; Watabe, Daichi; Tang, Ya; Lu, Honcheng; Kuno, Yoshinori; Takeiri, Fumitaka; Yamamoto, Takafumi; Brown, Craig M.; Hester, James; Kobayashi, Yoji; Kageyama, Hiroshi

doi:10.1002/anie.201605123

Cited by 37 publications

(34 citation statements)

References 35 publications

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“…Hence, oxyhydrides possessing the structural flexibility as typified by LSLHO system have potential for further improvement of the H ¹ conductivity. However, the preparation of oxyhydrides is mainly required special synthesis conditions such as a solid state reaction at high-pressure [6][7][8] or a strong reducing reaction using metal hydrides as the reductant. [9][10][11][12][13] Although the synthesis of the LSLHO system by a conventional solid-state reaction at ambient pressure has been reported, it is only suitable for a standard composition of La 2 LiHO 3 , which contains the lowest concentration of H ¹ in this system.…”

Section: ¹mentioning

confidence: 99%

Ambient Pressure Synthesis and H− Conductivity of LaSrLiH2O2

et al. 2017

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Recently, hydride ion (H −) has come to be recognized as new charge carrier for the transport of hydrogen in solids by realization of pure H − conduction in BaH 2 and La 2−x−y Sr x+y LiH 1−x+y O 3−y oxyhydride system (LSLHO). In this study, the H − conductive oxyhydride, LaSrLiH 2 O 2 (x = 0, y = 1 in LSLHO), was synthesized by a conventional solidstate reaction at ambient pressure. The crystal structure of LaSrLiH 2 O 2 , as well as the H − conductivity and bonding state of hydrogen, was examined by Rietveld analysis using X-ray and neutron diffraction data, attenuated total reflection Fourier transform spectroscopy (ATR-FTIR), and electrochemical impedance spectroscopy (EIS). The sample synthesized at ambient pressure had a K 2 NiF 4 -type layered perovskite structure composed of alternately stacked tetragonal (LiH 2 ) − and (LaSrO 2 ) + layers, and exhibited a conductivity of H − of 3.2 × 10 −6 S cm −1 at 300°C, which were the same structure and property as that reported previously for a sample synthesized by high-pressure synthesis.

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Section: ¹mentioning

confidence: 99%

Ambient Pressure Synthesis and H− Conductivity of LaSrLiH2O2

et al. 2017

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“…Supplementary sources of H 2 can be included within the cell, as with a mixture of NaBH 4 /Ca(OH) 2 [ 14 ]. The high-pressure technique has been quite successful in forming the oxyhydride compounds; to date Sr 2 VO 3 H [ 14 ], SrCrO 2 H [ 16 ], LaSrMnO 3.3 H 0.7 [ 17 ], and BaScO 2 H [ 13 ] have been reported (see Figure 1 ).…”

Section: Synthesis Of Oxyhydridesmentioning

confidence: 99%

“…The synthesis of LaSrMnO 3 H 0.7 was achieved via high pressure and high temperature at 5 GPa and 1000 °C on using powders of La 2 O 3 , MnO, Mn 2 O 3 , SrH 2 [ 17 ]. LaSrMnO 3.3 H 0.7 crystallizes in the tetragonal I 4/ mmm space group with disorder of the oxide and hydride anions mainly in the equatorial plane (Figure 1 (d)).…”

Section: Physical Properties In Oxyhydrides: Transport and Magnetismmentioning

confidence: 99%

“…Here, the oxidation state of the B -site cation is not unusual, as many other Ti 3+ compounds exist. Ever since, this family of materials has steadily grown, based on not only the topochemical route but also with the use of high-pressure solid-state reactions, extending the compositions to the Sc [ 13 ], V [ 14,15 ], Cr [ 16 ] or Mn [ 17 ] elements on top of the initial Co or Ti oxyhydrides.…”

Section: Introductionmentioning

confidence: 99%

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New chemistry of transition metal oxyhydrides

Kobayashi

Hernandez

Tassel

et al. 2017

Science and Technology of Advanced Materials

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In this review we describe recent advances in transition metal oxyhydride chemistry obtained by topochemical routes, such as low temperature reduction with metal hydrides, or high-pressure solid-state reactions. Besides the crystal chemistry, magnetic and transport properties of the bulk powder and epitaxial thin film samples, the remarkable lability of the hydride anion is particularly highlighted as a new strategy to discover unprecedented mixed anion materials.

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“…Over the past decade, the anion exchange of metal oxide for a hydride ion has become the subject of intensive research in the mixed-anion chemistry [6][7][8][9][10][11]. The original synthesis routes based on topotactic solid-state reactions and high-pressure methods were reported for a number of mixed-oxyanion crystalline phases with different levels of H -/O 2exchange [12][13][14][15][16][17][18][19][20][21][22]. Recently, investigations of the controllable oxidation of a metal-hydrogen mixture [23] have led to the synthesis of transition metal and rare-earth metal oxyhydride-type materials [24][25][26][27] which have demonstrated remarkable stability at room temperatures and atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

On Prediction of a Novel Chiral Material Y2H3O(OH): A Hydroxyhydride Holding Hydridic and Protonic Hydrogens

2020

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Examination of possible pathways of how oxygen atoms can be added to a yttrium oxyhydride system allowed us to predict new derivatives such as hydroxyhydrides possessing the composition M2H3O(OH) (M = Y, Sc, La, and Gd) in which three different anions (H-, O2−, and OH-) share the common chemical space. The crystal data of the solid hydroxyhydrides obtained on the base of DFT modeling correspond to the tetragonal structure that is characterized by the chiral space group P 4 1 . The analysis of bonding situation in M2H3O(OH) showed that the microscopic mechanism governing chemical transformations is caused by the displacements of protons which are induced by interaction with oxygen atoms incorporated into the crystal lattice of the bulk oxyhydride. The oxygen-mediated transformation causes a change in the charge state of some adjacent hydridic sites, thus forming protonic sites associated with hydroxyl groups. The predicted materials demonstrate a specific charge ordering that is associated with the chiral structural organization of the metal cations and the anions because their lattice positions form helical curves spreading along the tetragonal axis. Moreover, the effect of spatial twisting of the H- and H+ sites provides additional linking via strong dihydrogen bonds. The structure–property relationships have been investigated in terms of structural, mechanical, electron, and optical features. It was shown that good polar properties of the materials make them possible prototypes for the design of nonlinear optical systems.

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High‐Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order

Cited by 37 publications

References 35 publications

Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

New chemistry of transition metal oxyhydrides

On Prediction of a Novel Chiral Material Y2H3O(OH): A Hydroxyhydride Holding Hydridic and Protonic Hydrogens

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High‐Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order

Cited by 37 publications

References 35 publications

Ambient Pressure Synthesis and H<sup>&minus;</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

Ambient Pressure Synthesis and H<sup>&minus;</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

New chemistry of transition metal oxyhydrides

On Prediction of a Novel Chiral Material Y2H3O(OH): A Hydroxyhydride Holding Hydridic and Protonic Hydrogens

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Product

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Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>