STRUCTURE DETERMINATION OF SOME PHASES IN THE SYSTEMS: Zr-Al-Si AND Hf-Al- Si (ZrAl$sub 3$Si) Zr Si(Al), Hf(Si,Al) Zr$sub 3$Si$sub 2$ Hf$sub 3$Si$sub 2$) (in German)
Powder mixtures were pressed cold and then allowed to react under Ar at ca 1200 deg C. The products were powdered and pressed cold again, then homogenized for 4 to 12 hr undef Ar at 1200 deg C. The ZrAl/sub 3/ structure was confirmed (a = 4.01, < = 17.27 kX.E); Si-containing alloys Zr(Al,Si)/sub 3/ rich in Al are of the TiAl/sub 3/ structure; a = 5.509, c = 8.990 kX.E, c/a = 1.632; a powder pattern is tabulated, In the system Zr-- Si the region formerly indicated as U(II) was identified as a monosilicide of the CrB type, stabilized by Al. The cell constants vary from a = 3.754 to 3.780, b = 9.892 to 10.050, c = 3.746 to 3.78 kX.E, the higher values corresponding to Zr(Al/sub approximates 0.3/Si/sub approximates 0.7/); a representative powder pattern is tabulated. Al/Si substitution in this system leads to pseudo-tetragonal symmetry, as in Ti(Al,Si)/ sub 2/. A similar case arises (powder pattern table given) with Hf(Al/sub approximates 0.5/Si/sub approximates 0.5/); the constants for this case, similar to CrB again, are a = 3.707, b = 9.87/sub 0/, c = 3.746 kX.E. Tables are also given for powder patterns of Zr/sub 3/Si/sub 2/ and Hf/sub 3/Si/sub 2/. The se have the U/sub 3/Si/sub 2/ structure and the following lattice constants: Zr/sub 3/Si/sub 2/, a = 7.068, c = 3.707 kX.E, c/a = 0.5245; Hf/sub 3/Si/sub 2/, a = 6.986, c = 3.664 kX.E, c/a = 0.5245. (BBB)
- Research Organization:
- Universitat, Vienna
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-018388
- OSTI ID:
- 4029929
- Journal Information:
- Monatshefte fuer Chemie (Austria), Vol. Vol: 92; Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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Related Subjects
ALUMINUM ALLOYS
ARGON
CHEMICAL REACTIONS
COLD WORKING
COMPACTING
HAFNIUM ALLOYS
HAFNIUM COMPOUNDS
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
LATTICES
MIXING
PHASE DIAGRAMS
POWDERS
QUANTITATIVE ANALYSIS
SILICIDES
TABLES
URANIUM SILICIDES
ZIRCONIUM ALLOYS
ZIRCONIUM COMPOUNDS