Introduction to solids. by Leonid V. Azaroff

By Leonid V. Azaroff

This learn of reliable country relies at the premise that something nearly all of solids of sensible value have in universal is they are crystalline. the significance of crystallography has lengthy been well-known. this can be the 1st try to use the crystallinity of solids as a framework for discussiing their nature and houses. Concentrates at the constitution, nature and houses of inorganic crystalline solids, masking nearly all very important points of reliable nation.

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To distinguish the two kinds of axes, a tilde is placed over the numerical symbol of the corresponding rotation axis: I, 2, 3, etc. " The proper rotation 1 rotates an object representing all of space The rotoreflection through an angle of 0 or 360°, leaving it unchanged. axis I combines this operation with a reflection to give the configuration i''360' ! Fig. shown in Fig. 19. 19 Fig. 20 The enantiomorphous pair of sevens is not unlike the pair already encountered in Fig. 3. Accordingly, it can be said that the operation of 1 is equivalent to a reflection through a plane, specifically, a reflection plane or mirror plane symbolically represented by the letter m.

Cosine of an angle cannot exceed unity. a 4, etc. Table Determination of rotation COS -2 if -1 1 in axes allowed v (deg) n 180 2 7 1 120 3 0 0 90 4 +1 +2 +i 60 6 -1 +1 360 or 0 1 a lattice Chapter 18 2 Improper rotation axes. As stated earlier, an improper rotation from a right-handed one, and vice object axis repeats a left-handed One symmetry operation already encountered that produces such versa. If a rotation is com enantiomorphous sets is the operation of reflection. bined with a reflection into a single hybrid operation, the resulting opera tion is called rotoreflection.

The reason for this is that the two 2-fold axes 60° apart are indistinguishable from the symmetry-equiva lent 2-fold axes that result from the repetition of a single axis every 120° by rotation about the 3-fold axis. This case is different from the point group 422 where the 4 repeats each 2 at 90° intervals but the two different 2s are 45° apart. Geometrical crystallography 27 have already been considered and are shown in Fig. 28. Hence only three new combinations come about as a result of combining a proper rotation axis with a perpendicular mirror plane, as shown in Fig.

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