大脑
发表于 2025-3-21 18:29:05
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HEDGE
发表于 2025-3-21 22:13:39
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Deject
发表于 2025-3-22 00:55:01
The Lattice and Its Properties,m crystal illustrated in Fig. 3.1a. If each atom is represented simply by its centre of gravity, what remains is a . or . (Fig. 3.1b)..The concept of a lattice will now be developed from a lattice point via the line lattice and the plane lattice, finally to the space lattice..Every unit cell has eig
亵渎
发表于 2025-3-22 07:42:46
Crystal Structure,dentical, the collections of objects occupying them must also be identical. In general, crystals are not built up so simply as the crystal of . -polonium in Fig. 3.1!.Let us consider the construction of a crystal by means of a hypothetical example. Figure 4.1a shows a . with a rectangular unit cell
Alienated
发表于 2025-3-22 12:23:49
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fulmination
发表于 2025-3-22 15:32:42
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fulmination
发表于 2025-3-22 18:26:41
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incredulity
发表于 2025-3-22 22:48:19
The Seven Crystal Systems,0°, γ = 120° into a hexagonal and a trigonal crystal system..In Table 8.1, the seven crystal systems are listed along with the restrictions on the axial system. It is important to remember, however, that equivalence of crystallographic axes and special values of the angles are simply a consequence o
–FER
发表于 2025-3-23 01:42:40
Point Groups,he lattice points are now replaced by actual atoms, ions or molecules, they must themselves possess at least the full symmetry of the lattice point if the space group is to remain unchanged..In each crystal system, only the space group of the P-lattice or, in the trigonal system the R-lattice, need
bonnet
发表于 2025-3-23 06:07:27
Space Groups, symmetry not only of crystal lattices, but also of crystal structures..The space-group symbols for the 14 Bravais lattices are listed in Table 7.4. The space-group symbol does not in general enumerate all the symmetry elements of the space group. In particular, the space groups of centered lattices