Untitled

Tsvigunov, A. N.; Khotin, V. G.; Krasikov, A. S.; Svetlov, B. S.

doi:10.1023/a:1013907831439

Cited by 3 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on Rietveld refinements of the same data set in reciprocal space, the ZnO nanocrystals are 15.8(1) nm wide on average and 26 nm along the [001] direction (Figure S1–S2, Table S2). This is in agreement with both the PDF analysis and literature …”

Section: Resultssupporting

confidence: 93%

“…The first peak at 1.2 Å corresponds to the N–O distance in [NO 3 ] − . The second peak at ∼2.0 Å originates from Zn–O bonds with either tetrahedral coordination (1.8 Å in ZnO) or octahedral coordination (2.0 Å in ZnAl 2 O 4 ) . Both coordination models were fitted (Table S1), but the tetrahedral model refined to 0 wt %, whereas the octahedral model provides a good fit (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…XRD patterns of samples with different M/OH ratios (1:2: x , x = 6.25, 7.09, and 8.34 for M1–3, respectively) using MWS. Reference patterns for ZnAl 2 O 4 , AlOOH, and ZnO are shown below using a wavelength of 0.500 54 Å. The data were collected at beamline BL44B2, SPring-8, Japan.…”

Section: Resultsmentioning

confidence: 99%

“…The in-house XRD data were Rietveld refined using the Fullprof software suite . The initial structural models for ZnAl 2 O 4 , ZnO, and AlOOH were taken from the Inorganic Crystal Structure Database (ICSD 39473, 26170, and 59608). First, the instrumental resolution function was determined using a LaB 6 NIST 660A standard.…”

Section: Methodsmentioning

confidence: 99%

“…ZnAl 2 O 4 adopts a [A 2+ B 3+ 2 O 4 ] spinel structure in the cubic space group Fd 3̅ m (Figure a) . In the direct spinel structure, the oxygen atoms are arranged in a cubic closed packed configuration at the 32 e Wyckoff sites.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Sommer

Bøjesen

Reardon

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

The chemistry of ZnAl2O4 nanocrystal nucleation and growth is examined by X-ray scattering methods, and the results challenge the conventional understanding of its preparation by hydrothermal methods. The common assumption that a specific metal to hydroxide ion (M/OH) ratio is necessary to achieve a phase-pure product is shown to be inadequate. Pair distribution function analysis is used to identify distinct precursor structures, providing an understanding of why particular impurity phases are observed under certain M/OH ratios as heating is applied. In situ X-ray diffraction studies then probe the ZnAl2O4 growth in real time, from which optimal synthesis conditions and the influence of impurities is established. It is found that the heating rate plays a dominant role in impurity formation and dissolution. This observation is explored in three different hydrothermal synthesis methods (microwave, autoclave, and supercritical flow) having different intrinsic heating rates, and methodologies to prepare phase-pure ZnAl2O4 were successfully developed in each case. Ultimately, the atomic scale X-ray scattering information provides concrete guidance to tune the crystallite size, band gap, morphology, and defects of ZnAl2O4 nanocrystals in hydrothermal synthesis establishing a bottom up nonempirical approach to synthesis design.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Sommer

Bøjesen

Reardon

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

show abstract

Thermovaporous synthesis of fine crystalline gahnite (ZnAl2O4)

et al. 2006

View full text Add to dashboard Cite

Combinatorial Nanopowder Synthesis Along the ZnO–Al₂O₃Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Kim

Lai

Laine

2011

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Liquid-feed flame spray pyrolysis (LF-FSP) of mixtures of alumatrane [Al(OCH 2 CH 2 ) 3 N]/zinc acetate dihydrate [Zn (O 2 CCH 3 ) 2 . 2(H 2 O)] or zinc propionate [Zn(O 2 CCH 2 CH 3 ) 2 ]/ aluminum acetylacetonate [Al(Acac) 3 ] dissolved in EtOH in known molar ratios can be used to combinatorially generate nanopowders along the ZnO-Al 2 O 3 tie-line. LF-FSP was used to produce (ZnO) x (Al 2 O 3 ) 1Àx powders with x 5 0-1.0. Powders were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, thermal gravimetric analysis, differential thermal analysis, and BET. The resulting powders had average particle sizes (APSs) o100 nm with the majority being o50 nm. Analytical data suggest that at concentrations of interest for transparent conducting oxides, o10 mol% Al 2 O 3 the particle morphologies are combinations of plates and rods that grow with c/a ratios close to 1. The spinel phase dominates at (ZnO) x (Al 2 O 3 ) 1Àx (x 5 0.5 and 0.3). In the latter case, the currently accepted phase diagram for the ZnO-Al 2 O 3 couple indicates that phase separation should occur to form zinc spinel (ZnAl 2 O 4 ) and a-alumina. It appears that the rapid quenching during LF-FSP helps to preserve the spinel phase at ambient temperature giving rise to kinetic nanopowder products along the ZnO 2 -Al 2 O 3 tie-line. Finally, the solubility of ZnO in Al 2 O 3 and vice versa in the materials produced by LF-FSP suggest apparent flame temperatures reached before quenching are 17001-18001C. Efforts to re-pass the spinel phase powders, (ZnO) x (Al 2 O 3 ) 1Àx , x 5 0.5 and 0.3 through the LF-FSP system were made with the hope of generating core shell materials. However, instead the x 5 0.5 material generated materials closer to the x 5 0.3 composition and pure ZnO nanoparticles that coat the former materials. These results suggest that at LF-FSP flame temperatures ZnO remains in the vapor phase for sufficient times that Al 31 oxyions generated promote nucleation of finer particles leaving essentially phase pure ZnO still in the vapor phase to condense giving the two distinct particle morphologies observed. R. Riedel-contributing editor

show abstract

Untitled

Cited by 3 publications

References 1 publication

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Thermovaporous synthesis of fine crystalline gahnite (ZnAl2O4)

Combinatorial Nanopowder Synthesis Along the ZnO–Al₂O₃Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Contact Info

Product

Resources

About

Untitled

Cited by 3 publications

References 1 publication

Atomic Scale Design of Spinel ZnAl2O4 Nanocrystal Synthesis

Atomic Scale Design of Spinel ZnAl2O4 Nanocrystal Synthesis

Thermovaporous synthesis of fine crystalline gahnite (ZnAl2O4)

Combinatorial Nanopowder Synthesis Along the ZnO–Al2O3Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Contact Info

Product

Resources

About

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Atomic Scale Design of Spinel ZnAl₂O₄ Nanocrystal Synthesis

Combinatorial Nanopowder Synthesis Along the ZnO–Al₂O₃Tie Line Using Liquid‐Feed Flame Spray Pyrolysis