Electronic structure of Zn in oxide spinels

Schiessl, W.; Potzel, W.; Karzel, Helmut; Steiner, Markus J.; Köfferlein, M.; Kalvius, G. M.; Melzer, K.; Dietzmann, G.; Martín, A.; Halevy, I.; Gál, J.; Schäfer, Wolfgang; Will, G.; Mitchell, Dale W.; Das, T. P.

doi:10.1007/bf02069139

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…The absorbance spectra of the as-received ZnO, Al 2 O 3 , and 4 , both of which have the same spinel phase, where x and y are <1. One composition is slightly aluminum-rich, whereas the other composition is slightly gallium-rich (see Section IV, ''Discussion'').…”

Section: (1) Intrinsic Propertiesmentioning

confidence: 99%

“…In the normal spinel ZnM 2 O 4 , the Zn site is tetrahedrally coordinated by oxygen, while the M site is octahedrally coordinated by oxygen. 4 ZnAl 2 O 4 and ZnGa 2 O 4 are structurally isomorphous, where the Al 3+ and Ga 3+ cations are interchangeable, and a compound that contains both aluminum and gallium, Zn(xAl,(1−x)Ga) 2 O 4 , can be synthesized. ZnAl 2 O 4 is also found 5 as a naturally oc-curring mineral called gahnite.…”

Section: Introductionmentioning

confidence: 99%

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Optical Properties of Zinc Aluminate, Zinc Gallate, and Zinc Aluminogallate Spinels

Sampath

Cordaro

1998

Journal of the American Ceramic Society

294

150

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The optical spectra of zinc aluminate (ZnAl 2 O 4 ), zinc gallate (ZnGa 2 O 4 ), and zinc aluminogallate (ZnAlGaO 4 ) spinel powders were studied at wavelengths in the range of 250-900 nm using reflectance spectroscopy. The ZnAl 2 O 4 and ZnGa 2 O 4 powders were synthesized by using conventional ceramic processing techniques and had systematic variations in the molar ratio of ZnO to M 2 O 3 (M = Al or Ga). The cubic spinel crystal structure of each composition was confirmed via powder X-ray diffractometry. The ZnAl 2 O 4 powders showed optical properties in the ultraviolet wavelength region and had combined characteristics that were similar to that of ZnO (wurtzite structure) and Al 2 O 3 (corundum structure), which result from the similar local environments of the zinc and aluminum cations within the cubic spinel crystal structure. A mechanically induced optical absorption (optomechanical effect) in the ultraviolet wavelength region was also observed in ZnAl 2 O 4 . The ZnGa 2 O 4 powder followed a similar behavior, with the exception that the optomechanical effect did not occur in the gallate. The ZnAlGaO 4 showed optical spectra that were intermediate to that of the endpoint compositions.

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Section: (1) Intrinsic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Properties of Zinc Aluminate, Zinc Gallate, and Zinc Aluminogallate Spinels

Sampath

Cordaro

1998

Journal of the American Ceramic Society

294

150

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“…Bulk material presents an antiferromagnetic ordering below 10 K [4]. However, it has been reported for ZnFe 2 O 4 nanomaterial the existence of a significant magnetic moment, even at room temperature [5][6][7], as well as an increase in the ordering temperature [5]. Such effects have been associated to the presence of Fe 3+ ions at tetrahedral sites and the consequent existence of non zero exchange interactions between iron cations on different sites [6].…”

Section: Introductionmentioning

confidence: 99%

“…Such effects have been associated to the presence of Fe 3+ ions at tetrahedral sites and the consequent existence of non zero exchange interactions between iron cations on different sites [6]. This process of partial inversion is strongly dependent on the method used to prepare ZnFe 2 O 4 nanostructured materials [7,8], although it seems possible to make the following observations. Methods which use high temperature treatment generally lead to the Title of Publication (to be inserted by the publisher) ideal normal spinel structure whereas high energy ball milling [8,9] and soft chemical routes, such hydrothermal co-precipitation [5,7] or reverse micelle synthesis [10], induce a certain inversion degree.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Bottom-up Synthesized ZnFe<sub>2</sub>O<sub>4</sub> Nanoparticles

Gomes

Tourinho²,

Mestnik-Filho³

et al. 2004

JMNM

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Zinc ferrite nanoparticles are bottom-up synthesized and then peptized in aqueous media resulting in stable magnetic fluids. X-ray powder patterns are analyzed using Rietveld structure refinement and indicate the existence of cation inversion at the sites of the spinel-type nanocrystal. Magnetic and magneto-optical properties therefore arise and are investigated by static measurements performed on individual particles solutions.

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“…19 Zinc gallate is a normal spinel, although some studies have suggested a very small fraction of the zinc ions have changed lattice sites. 20 In the doped form, the manganese substitutes isoelectronically for the zinc ions within the spinel lattice. Zinc ions in this spinel sit in sites which are tetrahedrally coordinated by oxygen.…”

mentioning

confidence: 99%

ZnGa[sub 2]O[sub 4]:Mn phosphors for Thin-Film Electroluminescent Displays Exhibiting Improved Brightness

Flynn

Kitai

2001

J. Electrochem. Soc.

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Thin films of ZnGa2O4:normalMn films have been deposited by radio frequency magnetron sputtering in order to study the effects of annealing temperatures less than 1000°C on the thin-film electroluminescent properties. Energy-dispersive X-ray compositional analysis showed a loss of zinc during sputtering, with the film composition being Zn0.9Mn0.03Ga2O4. All films showed strong (111) and (222) X-ray reflections relative to the power standard. As the annealing temperature was raised, the texture rotated toward that of the powder material. The as-deposited films showed no photoluminescence; however, once annealed at T⩾750°C, a single emission band at 504 nm was observed. Emission wavelength was independent of annealing temperature. The electroluminescent brightness of the devices peaked at an annealing temperature of 900°C. Peak brightness and efficiency were 350 normalcd/m2 and 0.55 lm/W at 60 Hz, and 1500 normalcd/m2 and 0.30 lm/W at 600 Hz. These high brightness values have been attributed to the roughness of the substrates. © 2001 The Electrochemical Society. All rights reserved.

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Electronic structure of Zn in oxide spinels

Cited by 11 publications

References 8 publications

Optical Properties of Zinc Aluminate, Zinc Gallate, and Zinc Aluminogallate Spinels

Optical Properties of Zinc Aluminate, Zinc Gallate, and Zinc Aluminogallate Spinels

Structural and Magnetic Properties of Bottom-up Synthesized ZnFe<sub>2</sub>O<sub>4</sub> Nanoparticles

ZnGa[sub 2]O[sub 4]:Mn phosphors for Thin-Film Electroluminescent Displays Exhibiting Improved Brightness

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