THE CRYSTAL STRUCTURE OF Zr$sub 2$Al AND Hf$sub 2$Al AND Hf$sub 2$Al (in German)
Journal Article
·
· Monatshefte fuer Chemie (Austria)
Alloys were prepared by homogenizing samples for 6 to 12 hr at 1200 deg C under Ar. No Zr/sub 3/Al with a Cu/sub 3/Au structure was detected. In addition to alpha -ZrAl with parameters a = 3.25/sub 0/, c = 5.165 kX.E, c/a = 1.590, another phase similar to CuAl/sub 2/, Zr/sub 2/Al, was found. The powder pattern tabulated indicates a tetragonal cell with a = 6.84/sub 0/, c = 5.49/sub 0/ kX.E, c/a = 0.8027, shown to agree by line intensities with Zr/sub 2/Si, Only a small region of homogeneity was found for Zr/sub 2/Al. The cell diminishes with increasing Al content. In alpha -Zr(Al) the structure is evidentiy the intercalation type, since the parameters are larger than in pure alpha -Zr. In the ternary mixture Zr-- Al-- Si a continuous mixed crystal formation occurs between Zr/sub 2/Al and Zr/sub 2/Si; change in lattice parameters with composition are tabulated. The existence of Zr/sub 3/Al, Zr/sub 5/Al/sub 3/ (D 8/ sub 8/), and Zr/sub 2/Al/sub 3/ was confirm ed, but Zr/sub 5/Al/sub 3/ (T 1), Zr/ sub 4/Al/sub 3/, and Zr/sub 2/Al (NiAs) could not be found. In Hf-Al alloys prepared in the same manner, Hf/sub 2/Al was found in addition to alpha -Hf and alpha -Hf(Al). It has cell constants a = 6.762, c = 5.37/sub 4/, c/a = 0.794/sub 9/, and the cell is thus smaller than in Zr/sub 2/Al. The region of homogeneity is narrow. Mixed crystal formation exists between Hf/sub 2/Al and Hf/sub 2/Si; the lattice parameters of mixtures are tabulated. No evidence for the existence of ZrAl was found, but HfAl appears to be rather stable. (BBB)
- Research Organization:
- Universitat, Vienna
- NSA Number:
- NSA-18-018389
- OSTI ID:
- 4052350
- Journal Information:
- Monatshefte fuer Chemie (Austria), Journal Name: Monatshefte fuer Chemie (Austria) Vol. Vol: 92; ISSN MOCHA
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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