Structures of Solids - unit • Since the crystal is made...

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Structures of Solids Crystalline solids The atoms, molecules or ions pack together in an ordered arrangement Such solids typically have flat surfaces, with unique angles between faces and unique 3-dimensional shape Examples of crystalline solids include diamonds, and quartz crystals Amorphous solids No ordered structure to the particles of the solid No well defined faces, angles or shapes Often are mixtures of molecules which do not stack together well, or large flexible molecules Examples would include glass and rubber Unit Cells The ordered arrangement of atoms, molecules or ions in a crystalline solid means that we can describe a crystal as being constructed by the repetition of a simple stuctural
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Unformatted text preview: unit . • Since the crystal is made up of an arrangement of identical unit cells, then an identical point on each unit cell represents an identical environment within the crystal • The array of these identical points is termed the crystal lattice • The unit cells shown are cubic o All sides are equal length o All angles are 90° • The unit cell need not be cubic o The unit cell lengths along the x,y, and z coordinate axes are termed the a , b and c unit cell dimensions o The unit cell angles are defined as: α , the angle formed by the b and c cell edges β , the angle formed by the a and c cell edges γ , the angle formed by the a and b cell edges...
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