Yttrium aluminum garnet Nanoparticles with low antisite Defects studied with neutron and X-ray diffraction

Sang, Yuanhua; Yu, Dehong; Avdeev, Maxim; H, Qin; Wang, Jing; Liu, Hong; Lv, Yaohui

doi:10.1016/j.jssc.2012.04.034

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…Compared with the single-phase TiO 2 and Sn 3 O 4 , all the diffraction peaks are broad and weak, which indicates that the crystallinities are slightly reduced [ 21 ]. This result may be attributed to lattice distortion induced by interfacial strain because of different lattice parameters between Sn 3 O 4 and TiO 2 [ 22 ]. In addition, Raman spectroscopy results ( Figure 1 b) further confirm the purity of the synthesized TiO 2 /Sn 3 O 4 composite phase.…”

Section: Resultsmentioning

confidence: 99%

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

et al. 2017

Nanomaterials

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Novel TiO2/Sn3O4 heterostructure photocatalysts were ingeniously synthesized via a scalable two-step method. The impressive photocatalytic abilities of the TiO2/Sn3O4 sphere nanocomposites were validated by the degradation test of methyl orange and •OH trapping photoluminescence experiments under ultraviolet (UV) and visible light irradiation, respectively. Especially under the visible light, the TiO2/Sn3O4 nanocomposites demonstrated a superb photocatalytic activity, with 81.2% of methyl orange (MO) decomposed at 30 min after irradiation, which greatly exceeded that of the P25 (13.4%), TiO2 (0.5%) and pure Sn3O4 (59.1%) nanostructures. This enhanced photocatalytic performance could be attributed to the mesopore induced by the monodispersed TiO2 cores that supply sufficient surface areas and accessibility to reactant molecules. This exquisite hetero-architecture facilitates extended UV-visible absorption and efficient photoexcited charge carrier separation.

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Section: Resultsmentioning

confidence: 99%

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

et al. 2017

Nanomaterials

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“…This result may be attributed to lattice distortion induced by interfacial strain because of the different lattice parameters between Sn 3 O 4 and TiO 2 . 28 The defects may affect photocatalysis by effective capture of the photoexcited electrons, and thus inhibit the recombination of the photoexcited electrons and holes. 29 The morphology and microstructure of the samples were observed using SEM and HRTEM measurements.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of scaly Sn₃O₄/TiO₂nanobelt heterostructures for enhanced UV-visible light photocatalytic activity

et al. 2015

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A novel scaly Sn3O4/TiO2 nanobelt heterostructured photocatalyst was fabricated via a facile hydrothermal route. The scaly Sn3O4 nanoflakes can be synthesized in situ and assembled on surface coarsened TiO2 nanobelts through a hydrothermal process. The morphology and distribution of Sn3O4 nanoflakes can be well-controlled by simply tuning the Sn/Ti molar ratio of the reactants. Compared with single phase nanostructures of Sn3O4 and TiO2, the scaly hybrid nanobelts exhibited markedly enhanced photoelectrochemical (PEC) response, which caused higher photocatalytic hydrogen evolution even without the assistance of Pt as a co-catalyst, and enhanced the degradation ability of organic pollutants under both UV and visible light irradiation. In addition to the increased exposure of active facets and broad light absorption, the outstanding performance is ascribed to the matching energy band structure between Sn3O4 and TiO2 at the two sides of the heterostructure, which efficiently reduces the recombination of photo-excited electron-hole pairs and prolongs the lifetime of charge carriers. Both photocatalytic assessment and PEC tests revealed that Sn3O4/TiO2 heterostructures with a molar ratio of Sn/Ti of 2/1 exhibited the highest photocatalytic activity. This study provides a facile and low-cost method for the large scale production of Sn3O4 based materials in various applications.

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“…[ 9,10 ] Similarly, off‐stoichiometric ceramics have been reported with up to 1 at.% Y 3+ excess (i.e., Y 3.03 Al 4.97 O 12 ) deduced from systematic analysis of lattice parameters, [ 11 ] but such a limited stability range makes it challenging to synthesize and characterize these materials. [ 12 ]…”

Section: Introductionmentioning

confidence: 99%

“…Y3.03Al4.97O12) deduced from systematic analysis of lattice parameters, 11 but such a limited stability range makes it challenging to synthesise and characterise these materials. 12 The near-total segregation of the A and B cations into their respective 8-and 6/4-coordinate sites means that RE 3+ dopants into YAG adopt 8-fold coordination, producing predictable and wellcharacterised luminescence properties. In principle, the disruption of A3B5O12 stoichiometry by increasing the A/B ratio (i.e.…”

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Highly Nonstoichiometric YAG Ceramics with Modified Luminescence Properties

Cao

Becerro

Castaing

et al. 2023

Adv Funct Materials

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Yttrium aluminium garnet Y3Al5O12 (YAG) is a widely used phosphor host. Its optical properties are tuned by chemical substitution at its YO8 or AlO6/AlO4 sublattices, with emission wavelengths defined by a finite number of rare-earth (YO8 sublattice) and transition-metal (AlO6/AlO4 sublattice) dopants which have been explored extensively. Non-stoichiometric compositions Y3+xAl5-xO12 (x ≠ 0) may offer a route to new emission wavelengths by distributing dopants over multiple crystallographic sites, but deviation from Y3Al5O12 stoichiometry is difficult to achieve and limited generally to ≤ 1% excess Y 3+ .Here we report a series of highly non-stoichiometric YAG ceramics Y3+xAl5-xO12 (0 ≤ x ≤ 0.4), with up to 20% of the AlO6 sublattice substituted by Y 3+ , synthesised by advanced melt-quenching techniques. This impacts the up-conversion luminescence of Yb 3+ /Er 3+ -doped systems, whose yellow-green emission differs from the red-orange emission of their stoichiometric counterparts. This contrasts with YAG:Ce 3+ where the dopant ions occupy the YO8 sublattice exclusively, with down-conversion luminescence that is hardly affected by host non-stoichiometry. Beyond YAG, analogous highly nonstoichiometric systems should be obtainable for a range of functional garnets, demonstrated here by the successful synthesis of Gd3.2Al4.8O12 and Gd3.2Ga4.8O12. This opens the way to property tuning by control of garnet host stoichiometry, and the prospect of improved performance or new applications for garnet-type materials.Yttrium aluminium garnet Y3Al5O12 (YAG) is a widely used phosphor host material with notable commercial and technological applications in white LED lighting 1 , scintillation detectors 2 and solid state lasers. 3 Its crystal structure, of general formula A3B5O12, contains three A cations (Y 3+ ) per formula unit exclusively in 8-fold dodecahedral coordination by oxide (YO8), with five B cations (Al 3+ ) distributed between two octahedral (AlO6) and three tetrahedral (AlO4) sites. This provides chemical versatility, as the Y 3+ site can accommodate rare earth (RE 3+ ) dopants with a range of ionic radii spanning most of the lanthanide series, whilst the Al 3+ sites may be substituted by other transitionand post-transition metals, producing a range of characteristic emission bands that underpin its applications. This versatility can lead to relatively complex systems such as Y3Al2Ga3O12, where Ce 3+ and Cr 3+ can be co-substituted with tuning of the Al 3+ /Ga 3+ ratio to generate high performance persistent phosphors. 4,5 Whilst A and B sites can host many different substituents, the structure is far less tolerant of deviations from A3B5O12 stoichiometry, to the extent that YAG is often considered as an archetypal line phase. Nevertheless, off-stoichiometric (as opposed to highly non-stoichiometric) Y-rich single crystals have been reported by melt-growth of aluminate and gallate garnets, [6][7][8] with the presence of ≤ 1 at.% excess Y 3+ at the Al 3+ sublattice inferred spectroscopically, 7,8 consistent with theo...

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Yttrium aluminum garnet Nanoparticles with low antisite Defects studied with neutron and X-ray diffraction

Cited by 17 publications

References 18 publications

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

Synthesis of scaly Sn₃O₄/TiO₂nanobelt heterostructures for enhanced UV-visible light photocatalytic activity

Highly Nonstoichiometric YAG Ceramics with Modified Luminescence Properties

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Yttrium aluminum garnet Nanoparticles with low antisite Defects studied with neutron and X-ray diffraction

Cited by 17 publications

References 18 publications

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

Enhanced UV-Visible Light Photocatalytic Activity by Constructing Appropriate Heterostructures between Mesopore TiO2 Nanospheres and Sn3O4 Nanoparticles

Synthesis of scaly Sn3O4/TiO2nanobelt heterostructures for enhanced UV-visible light photocatalytic activity

Highly Nonstoichiometric YAG Ceramics with Modified Luminescence Properties

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Synthesis of scaly Sn₃O₄/TiO₂nanobelt heterostructures for enhanced UV-visible light photocatalytic activity