Time-resolved pair distribution function analysis of disordered materials on beamlines BL04B2 and BL08W at SPring-8

Ohara, Koji; Tominaka, Satoshi; Yamada, Hiroki; Takahashi, Masakuni; Yamaguchi, Hiroshi; Utsuno, Futoshi; Umeki, Takashi; Yao, Atsushi; Nakada, Kengo; Takemoto, Michitaka; Hiroi, Satoshi; Tsuji, Naruki; Wakihara, Toru

doi:10.1107/s1600577518011232

Cited by 50 publications

(47 citation statements)

References 38 publications

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“…The hybrid detectors of Ge and CdTe were employed for data collection. The reduced PDF G ( r ) was obtained by the conventional Fourier transform of the collected data 58 .…”

Section: Methodsmentioning

confidence: 99%

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

et al. 2019

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Hematite (α-Fe2O3) is one of the most promising candidates as a photoanode materials for solar water splitting. Owing to the difficulty in suppressing the significant charge recombination, however, the photoelectrochemical (PEC) conversion efficiency of hematite is still far below the theoretical limit. Here we report thick hematite films (∼1500 nm) constructed by highly ordered and intimately attached hematite mesocrystals (MCs) for highly efficient PEC water oxidation. Due to the formation of abundant interfacial oxygen vacancies yielding a high carrier density of ∼1020 cm−3 and the resulting extremely large proportion of depletion regions with short depletion widths (<10 nm) in hierarchical structures, charge separation and collection efficiencies could be markedly improved. Moreover, it was found that long-lived charges are generated via excitation by shorter wavelength light (below ∼500 nm), thus enabling long-range hole transfer through the MC network to drive high efficiency of light-to-energy conversion under back illumination.

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“…The hybrid detectors of Ge and CdTe were employed for data collection. The reduced PDF G ( r ) was obtained by the conventional Fourier transform of the collected data 58 .…”

Section: Methodsmentioning

confidence: 99%

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

et al. 2019

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“…X-ray total scattering data for pair distribution function (PDF) analysis of the BaTiO 3 precursor powders was collected on BL08W 44 at SPring-8 (Japan) using a flat 2D panel detector and a wavelength of 0.10765 Å. The time resolution of the recorded data was 5 s. For the ex situ measurement, a powder preannealed at 530 °C in air was filled in a Kapton tube (OD 1.05 mm, Goodfellow, England), and for the in situ measurements, the precursor powders were loaded in quartz capillaries (OD 1.5 mm, CharlesSupper Company, Westborough, USA) with glass wool on each side.…”

Section: Experimental Sectionmentioning

confidence: 99%

Structures and Role of the Intermediate Phases on the Crystallization of BaTiO₃ from an Aqueous Synthesis Route

et al. 2021

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Carbonate formation is a prevailing challenge in synthesis of BaTiO 3 , especially through wet chemical synthesis routes. In this work, we report the phase evolution during thermal annealing of an aqueous BaTiO 3 precursor solution, with a particular focus on the structures and role of intermediate phases forming prior to BaTiO 3 nucleation. In situ infrared spectroscopy, in situ X-ray total scattering, and transmission electron microscopy were used to reveal the decomposition, pyrolysis, and crystallization reactions occurring during thermal processing. Our results show that the intermediate phases consist of nanosized calcite-like BaCO 3 and BaTi 4 O 9 phases and that the intimate mixing of these along with their metastability ensures complete decomposition to form BaTiO 3 above 600 °C. We demonstrate that the stability of the intermediate phases is dependent on the processing atmosphere, where especially enhanced CO 2 levels is detrimental for the formation of phase pure BaTiO 3 .

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“…[ 16 ] The reduced PDF G ( r ) was obtained by the conventional Fourier transform of S ( Q ) with Q max of 25 Å −1 . [ 17 ]…”

Section: Methodsmentioning

confidence: 99%

“…X‐ray total scattering data for time‐resolved PDF analysis were collected at BL08W [ 17 ] of SPring‐8 (Figure S1, Supporting Information), Japan, using a 16 in. flat‐panel detector (XRD 1621 CN3) and an incident X‐ray energy of E = 115 keV ( λ = 0.1077 Å) with a sample‐to‐detector distance of ≈742 mm.…”

Section: Methodsmentioning

confidence: 99%

Observation of Liquid Phase Synthesis of Sulfide Solid Electrolytes Using Time‐Resolved Pair Distribution Function Analysis

Ohara

Masuda

Yamaguchi

et al. 2020

Physica Status Solidi (b)

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Time‐resolved pair distribution function (PDF) analysis is performed to clarify the formation mechanism of Li3PS4 sulfide solid electrolytes in liquid phase synthesis with acetonitrile (AN), tetrahydrofuran (THF), and ethyl acetate (EA) solvents. This aims to clarify the relationship between their formations and lithium ionic conductivity. A complex is formed between the precursor of the sulfide solid electrolyte and each solvent during the liquid phase synthesis. The ratio of the solvent to the electrolyte is 3.03 in THF solution. The formation speed of precursors of sulfide solid electrolytes increases in the order AN < THF < EA solution, which is the same order as the lithium ionic conductivity. Thus, the correlation between the ionic conductivity and the formation rate of the precursor of the sulfide solid electrolyte might be related to the stability of the complex formed between Li3PS4 and the solvent during liquid phase synthesis.

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Time-resolved pair distribution function analysis of disordered materials on beamlines BL04B2 and BL08W at SPring-8

Cited by 50 publications

References 38 publications

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

Structures and Role of the Intermediate Phases on the Crystallization of BaTiO₃ from an Aqueous Synthesis Route

Observation of Liquid Phase Synthesis of Sulfide Solid Electrolytes Using Time‐Resolved Pair Distribution Function Analysis

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Time-resolved pair distribution function analysis of disordered materials on beamlines BL04B2 and BL08W at SPring-8

Cited by 50 publications

References 38 publications

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

Structures and Role of the Intermediate Phases on the Crystallization of BaTiO3 from an Aqueous Synthesis Route

Observation of Liquid Phase Synthesis of Sulfide Solid Electrolytes Using Time‐Resolved Pair Distribution Function Analysis

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Structures and Role of the Intermediate Phases on the Crystallization of BaTiO₃ from an Aqueous Synthesis Route