THE CRYSTAL STRUCTURES OF Hf$sub 3$Al$sub 2$ AND OF Hf$sub 5$Al$sub 3$Ox

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Acta Chemica Scandinavica (Denmark) Divided into Acta Chem. Scand., Ser. A and Ser. B

OSTI ID:4121550

Edshammar, L

The existence of various phases in the aluminumhafnium system was previously reported. Arc-melting followed by quenching to room temperature revealed phases having the composition Hf/sub 3/Al/sub 2/ and HfAl. Samples of compositions HfAl/sub 0.5-0.7/ gave weak lines similar to the oxygen-stabilized phase Zr/sub 5/Al/sub 3/O/sub x/. This suggested isomorphism between the Hf and Zr phases was confirmed by gradually adding oxygen (as HfO/sub 2/) to the samples. The unit cell of Hf/sub 3/Al/sub 2/ was found to be tetragonal with the dimensions a = 7.535 A and c = 6.906 A. The powder pattern of Hf/sub 5/Al/sub 3/O/ sub x/ could be indexed assuming a hexagonal unit cell with the dimensions a = 8.066 A and c = 5.678 A. The atomic positions and space groupings are given for each of the phases. (B.O.G.)

• Research Organization: Univ. of Stockholm
• NSA Number: NSA-15-001862
• OSTI ID: 4121550
• Journal Information: Acta Chemica Scandinavica (Denmark) Divided into Acta Chem. Scand., Ser. A and Ser. B, Journal Name: Acta Chemica Scandinavica (Denmark) Divided into Acta Chem. Scand., Ser. A and Ser. B Vol. Vol: 14; ISSN ACSAA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM ALLOYS
ALUMINUM OXIDES
CONFIGURATION
CRYSTALS
HAFNIUM ALLOYS
HAFNIUM OXIDES
INTERMETALLIC COMPOUNDS
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
ZIRCONIUM OXIDES