TU Darmstadt / ULB / TUbiblio

Synthesis of nanocrystalline aluminum–gallium nitride (AlxGa1− xN; x = 0.1 to 0.5) with oxide precursors via ammonolysis

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), pp. 2350-2358. MATERIALS RESEARCH SOCIETY, ISSN 0884-2914,
[Article]

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.

Item Type: Article
Erschienen: 2003
Creators: Faulhaber, Sabine ; Loeffler, Lars ; Hu, Jerry ; Kroke, Edwin ; Riedel, Ralf ; Lange, Fred F.
Title: Synthesis of nanocrystalline aluminum–gallium nitride (AlxGa1− xN; x = 0.1 to 0.5) with oxide precursors via ammonolysis
Language: English
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.

Journal or Publication Title: Journal of Materials Research
Journal volume: 18
Number: 10
Publisher: MATERIALS RESEARCH SOCIETY
Uncontrolled Keywords: NUCLEAR-MAGNETIC-RESONANCE, GROUP-III NITRIDES, GA-71 NMR, GROWTH, AL-27, POWDERS, AMMONIA, MOCVD, GAN
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 25 Apr 2012 09:33
Official URL: http://dx.doi.org/10.1557/JMR.2003.0329
Identification Number: doi:10.1557/JMR.2003.0329
Funders: 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.
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details