Phase evolution during ball milling of Al in NH{sub 3} and subsequent annealing

Book · Wed Dec 30 23:00:00 EST 1998

OSTI ID:323529

Nikolov, J I; Williams, J S; Llewellyn, D J ^[1]; Calka, A ^[2]

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1. Australian National Univ., Canberra (Australia). Dept. of Electronic Materials Engineering
2. Univ. of Wollongong (Austria). Dept. of Materials Engineering

Phase evolution during ball milling of Al in both N{sub 2} and NH{sub 3} gas has been compared and the annealing behavior studied in some detail. X-ray diffraction, differential thermal analysis, combustion analysis and scanning and transmission electron microscopy have been used as analytical techniques. Results have shown that a nitride is not formed in N{sub 2} but that Al forms into many small, hollow spheres during milling. In contrast, milling in NH{sub 3} results in an amorphous Al{sub x}N{sub y}(O) phase which transforms into crystalline AlN and Al{sub 2}O{sub 3} on annealing to 1000 C.

• OSTI ID: 323529
• Report Number(s): CONF-971201--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
AMMONIA
ANNEALING
EXPERIMENTAL DATA
MICROSCOPY
MILLING
NITROGEN
PHASE STUDIES
SYNTHESIS
X-RAY DIFFRACTION