Download PDF by J. H. Westbrook, R. L. Fleischer: Intermetallic Compounds, Volume 1, Crystal Structures of

By J. H. Westbrook, R. L. Fleischer

ISBN-10: 0471608807

ISBN-13: 9780471608806

An intermetallic compound is one which include or extra steel components found in convinced proportions in alloy. they're utilized in a variety of industries reminiscent of semiconductors and the aerospace undefined. millions of a whole bunch the nickel aluminum alloy are used around the world each year.

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Extra resources for Intermetallic Compounds, Volume 1, Crystal Structures of

Example text

M (Figure 19). p. alloys MxN^ (Table 8). The carbides Ti 2 C, Gd 2 C, Ti 8 C 5 , V 6 C 5 , and V8C7 are located in area Ia of the structural map, indicating covalent-type bonding, while the nitrides Ti 2 N, Nb 4 N 3 and the hydrides Pd 2 H, P d D 0 8 are located at low a{, indicating Coulomb-type interactions (Figure 23). Two other types of interstitial alloys can be compared if the composition is formulated in a similar way to that used for the Mz • xly compounds with the convention that z>y >x: DxM^I2 with I = O, S, Se, F, Cl, I as in Ti0 8 O, LiIc83S, Tm0 75Se, SnF4, AlCl3 or HfI4 (Table 8); and n ^M7 • xOy as in D Ti2 n O 2 or D Nb 3 D O 3 with vacancies in both sublattices.

The fact that highly symmetric structures can only be constructed from M and N atoms with a single environment shows that the frequent observation of high symmetry (Laves, 1967) is a consequence of Pauling's rule for small numbers of constituents. In most cases, the experimentally observed symmetry is identical with the symmetry determined for the undistorted lattice. This can be used to find a structural model of the ordered structure from electron diffraction patterns. Alloys with small single-crystal domains of ordered structures can be investigated by electron diffraction to determine the unit cell and the symmetry from the diffraction pattern.

The c-axis of the hexagonal cell corresponds to one of the four space diagonals of the cubic cell. The only periodic 3D packing of spheres having close-packed hexagonal layers in four Figure 4. p. stacking of hexagonal layers in ABC position inclined directions is ccc. All other sequences are maintained in one direction only. g. in the ccc Cu structure, must be strong enough to stabilize the atoms of the third layer at the proper position. The Sm atoms of chhchhchh structure must be stabilized in the ninth layer.

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Intermetallic Compounds, Volume 1, Crystal Structures of by J. H. Westbrook, R. L. Fleischer


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