Faulhaber, Sabine ; Loeffler, Lars ; Hu, Jerry ; Kroke, Edwin ; Riedel, Ralf ; Lange, Fred F. (2003)
Synthesis of nanocrystalline aluminum–gallium nitride (AlxGa1− xN; x = 0.1 to 0.5) with oxide precursors via ammonolysis.
In: Journal of Materials Research, 18 (10)
doi: 10.1557/JMR.2003.0329
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Oxygen-containing precursor systems for the synthesis of mixed aluminum-gallium nitride (AlxGa1-xN with x = 0.1 to 0.5) through ammonolysis (heat treatment under ammonia) were evaluated. Three different precursor systems were studied: (i) aluminum isopropoxide (aluminum sec-butoxide)/gallium isopropoxide hydrolyzed with excess water and cross-linked with 1,6-hexanediol, (ii) aluminum-gallium hydroxide coprecipitated from aluminum-gallium nitrate solution, and (iii) spray-dried aluminum-gallium nitrate solutions. The specimens were heat-treated between 700 degreesC and 1100 degreesC and were characterized mainly by x-ray diffraction, nuclear magnetic resonance (NMR), and transmission electron microscopy (TEM). NMR was used to follow the conversion of oxygen to nitrogen bonds. TEM in combination with energy-dispersive x-ray spectroscopy was used to determine the solid-solution composition for separated particles. It is possible to synthesize a mixed hexagonal (AI,Ga)N with crystallite sizes in the range of similar to10 nm from all three precursor systems, but all products contained larger GaN crystals ranging from 20 nm (alkoxide-derived) to 200 nm (hydroxide-detived) and a fraction of untransformed Al-O bonds; e.g., (amorphous or gamma-phase) Al2O3.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2003 |
| Autor(en): | Faulhaber, Sabine ; Loeffler, Lars ; Hu, Jerry ; Kroke, Edwin ; Riedel, Ralf ; Lange, Fred F. |
| Art des Eintrags: | Bibliographie |
| Titel: | Synthesis of nanocrystalline aluminum–gallium nitride (AlxGa1− xN; x = 0.1 to 0.5) with oxide precursors via ammonolysis |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2003 |
| Verlag: | MATERIALS RESEARCH SOCIETY |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Research |
| Jahrgang/Volume einer Zeitschrift: | 18 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1557/JMR.2003.0329 |
| Kurzbeschreibung (Abstract): | Oxygen-containing precursor systems for the synthesis of mixed aluminum-gallium nitride (AlxGa1-xN with x = 0.1 to 0.5) through ammonolysis (heat treatment under ammonia) were evaluated. Three different precursor systems were studied: (i) aluminum isopropoxide (aluminum sec-butoxide)/gallium isopropoxide hydrolyzed with excess water and cross-linked with 1,6-hexanediol, (ii) aluminum-gallium hydroxide coprecipitated from aluminum-gallium nitrate solution, and (iii) spray-dried aluminum-gallium nitrate solutions. The specimens were heat-treated between 700 degreesC and 1100 degreesC and were characterized mainly by x-ray diffraction, nuclear magnetic resonance (NMR), and transmission electron microscopy (TEM). NMR was used to follow the conversion of oxygen to nitrogen bonds. TEM in combination with energy-dispersive x-ray spectroscopy was used to determine the solid-solution composition for separated particles. It is possible to synthesize a mixed hexagonal (AI,Ga)N with crystallite sizes in the range of similar to10 nm from all three precursor systems, but all products contained larger GaN crystals ranging from 20 nm (alkoxide-derived) to 200 nm (hydroxide-detived) and a fraction of untransformed Al-O bonds; e.g., (amorphous or gamma-phase) Al2O3. |
| Freie Schlagworte: | NUCLEAR-MAGNETIC-RESONANCE, GROUP-III NITRIDES, GA-71 NMR, GROWTH, AL-27, POWDERS, AMMONIA, MOCVD, GAN |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 25 Apr 2012 09:33 |
| Letzte Änderung: | 30 Jul 2018 05:40 |
| PPN: | |
| Sponsoren: | All research expenses were supported by the Materials Research Laboratory (MRL) Program of the National Science Foundation under Award No. DMR00-80034., The research was initiated when Dr. Kroke was a visiting researcher at University of California Santa Barbara (UCSB), partially supported by an Alexander von Humboldt Feodor Lynen Fellowship and partially supported by funds from a Max Planck Research, Award (FFL) for International Cooperation., Sabine Faulhaber, student of materials science at TU Darmstadt and a visiting researcher at UCSB, was primarily supported by a Deutscher Akademischer Austauschdienst (DAAD), German Academic Exchange Service Grant and the same Max Planck Research Award. |
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