Synthesis and infrared study of nanosized aluminum nitride powders prepared by direct current arc plasma
Article Abstract:
The roles of reaction pressure and vibration in changing the size and morphology of nanoscale aluminum nitride (AlN) crystals have been studied. Direct current arc plasma using a mixture of ammonia and nitrogen was used in synthesizing nanocrystalline AlN powders. Small-angle x-ray scattering, transmission electron microscopy and Fourier transform infrared spectroscopy were used in studying the physical changes. Results show the reaction pressure can be used in controlling the size of the AlN crystals because the crystals have thermal stability surfaces. The crystals also have a Frohlich mode due to the size effect.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Nonstoichiometric properties of nanoporous iron oxide films
Article Abstract:
Pore size distribution of iron oxide films was determined by N2 adsorption isotherm at 77 K and quartz crystal microbalance method. The oxide films were synthesized using the polymer precursor method with poly(vinyl alcohol) (PVA). Results show the crystal and pore structures of the oxide films is controlled by the amount of PVA in a coating solution. The crystalline structure changes from alpha- to gamma-Fe2O3 with an increase in PVA. There is also a layer of Fe3O4 in a mixed valence state on the surface of the microporous film.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
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