Neutron diffraction study on protonated and hydrated layered perovskite

Nishimoto, Shinji; Matsuda, Motohide; Harjo, Stefanus; Hoshikawa, Akinori; Ishigaki, Tōru; Kamiyama, Takashi; Miyake, Michihiro

doi:10.1016/j.jssc.2006.06.019

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…This H-O distance is in good agreement with those published on protonated phases. 17 At the opposite of this H-O2 short distance, a long H-O3 distance (2.28(1) A ˚) is observed with an apical oxygen of the adjacent perovskite layer. As for the LiO 4 tetrahedra, the H + sites are aligned along the a axis.…”

Section: ∑ Structural Study Of Lihsrta 2 Omentioning

confidence: 97%

Mechanism of a reversible CO2 capture monitored by the layered perovskite Li2SrTa2O7

et al. 2010

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We demonstrate for the first time, a new CO(2) capture ability monitored by a Ruddelsden-Popper compound. Under a humid CO(2) atmosphere, Li(2)SrTa(2)O(7) is transformed into LiHSrTa(2)O(7) releasing lithium hydroxide which combined with the atmospheric CO(2) leads to Li(2)CO(3). The presence of carbonate is confirmed by IR, thermal analysis coupled with mass spectroscopy and diffraction experiments (X-ray and neutron). The structural study of LiHSrTa(2)O(7) performed with X-ray and neutron diffraction data showed that the structure differs from that of LiHSrTa(2)O(7) obtained by ionic exchange from Li(2)SrTa(2)O(7) by the Li(+)/H(+) repartition in the interlayer spacing. In the case of the LiHSrTa(2)O(7) studied in this paper, the Li(+) and H(+) ions are ordered, while in the other form, each cation is unequally distributed on 2 sites. By heating, Li(2)SrTa(2)O(7) is recovered showing that the CO(2) capture is reversible and the cyclability of the CO(2) capture has been tested during six cycles.

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Section: ∑ Structural Study Of Lihsrta 2 Omentioning

confidence: 97%

Mechanism of a reversible CO2 capture monitored by the layered perovskite Li2SrTa2O7

et al. 2010

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“…The graphical comparison of the partially protonated hydrated titanate H0.7Na0.3NdTiO4•0.3H2O investigated here and La-containing deuterated compound D0.34Na0.66LaTiO4*0.59D2O reported in [63] is presented in Figure 6. Both structures are practically identical.…”

Section: Resultsmentioning

confidence: 99%

“…The lattice parameters calculation and Rietveld refinement were performed based on all the reflections observed using GSAS software. The initial structural parameters were adopted from the paper [63]. Neutron diffraction patterns were obtained on an IR-8 research neutron reactor (neutron wavelength λ = 1.7526 Å, angle range 2θ = 10-130 • , accumulation time 50 h).…”

Section: Instrumentationmentioning

confidence: 99%

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Protonated Forms of Layered Perovskite-Like Titanate NaNdTiO4: Neutron and X-ray Diffraction Structural Analysis

Silyukov

Kurnosenko

Minich

et al. 2021

Solids

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Structures of partially and completely protonated Ruddlesden–Popper phases, H0.7Na0.3NdTiO4·0.3H2O and HNdTiO4, have been established by means of neutron and X-ray diffraction analysis and compared among themselves as well as with that of the initial titanate NaNdTiO4. It was shown that while interlayer sodium cations in the partially protonated form are coordinated by nine oxygen atoms, including one related to intercalated water, in the fully protonated compound the ninth oxygen proves to be an axial anion belonging to the opposite slab of titanium-oxygen octahedra. Moreover, the partially protonated titanate was found to significantly differ from the other two in the octahedron distortion pattern. It is characterized by a weakly pronounced elongation of the octahedra towards the Nd-containing interlayer space making Ti4+ cations practically equidistant from both axial oxygen atoms, which is accompanied by a low-frequency shift of the bands relating to the asymmetric stretching mode of axial Ti–O bonds observed in the Raman spectra.

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