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Some physical properties of crystals differ indirection n because crystal lattices are often anisotropic.A polycrystal is an aggregate of numerous tiny crystallites.Unless the polycrystal is an isotropic aggregate of crystallites,the physical properties of the polycrystal vary with n.The direction-dependent functions (DDF) for crystals andpolycrystals are introduced to describe the variations of thephysical properties in direction n. Until now there are fewpapers dealing systematically with relations between theDDF and the crystalline orientation distribution. Herein wegive general expressions of the DDF for crystals and polycrystals.We discuss the applications of the DDF in describingthe physical properties of crystals and polycrystals.
Some physical properties of crystals differ indirection n because crystal lattices are often anisotropic. A polycrystal is an aggregate of numerous tiny crystallites. Unnumbered polycrystal is an isotropic aggregate of crystallites, the physical properties of the polycrystal vary with n. Direction-dependent functions (DDF) for crystals and polycrystals are introduced to describe the variations of thephysical properties in direction n. Until now there there are are paperspapers systematically with the relationship between theDDF and the crystalline orientation distribution. Herein wegive general expressions of the DDF for crystals and polycrystals. We discuss the applications of the DDF in describing the physical properties of crystals and polycrystals.