Crystallography Lecture Notes PDF
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Uploaded by BrainySugilite8568
Dr. wafaa soliman
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Summary
These lecture notes present an overview of crystallography, focusing on the hexagonal, trigonal, and cubic systems. Concepts like elements of symmetry and crystallographic elements are discussed.
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Crystallography Prepared by: Dr. wafaa soliman For second year chemistry branch 5- Hexagonal system Elements of symmetry Axis: 7 (1c , 3a1,a2,a3 , 3 (ب ينا لمحاور Planes: 7m Center: + ve Crystalographic elements ( a1 = a2 = a3 ≠ c ) ,( α = β = 90 ≠ δ = 120 ) Crystal forms 1- Bas...
Crystallography Prepared by: Dr. wafaa soliman For second year chemistry branch 5- Hexagonal system Elements of symmetry Axis: 7 (1c , 3a1,a2,a3 , 3 (ب ينا لمحاور Planes: 7m Center: + ve Crystalographic elements ( a1 = a2 = a3 ≠ c ) ,( α = β = 90 ≠ δ = 120 ) Crystal forms 1- Basal pinacoid..…(0001) 2F 2- Hexagonal prism first order…….(1010) 6F 3- Hexagonal prism second order….(1110) 6F 4- Dihexagonal prism………(hk00) 12F 5- Hexagonal bipyramid first order..(h0hL) 12F 6- Hexagonal bipyramid second order…(hhhL) 12F Crystal forms 7- Dihexagonal bipyramid ……………….…….(hk0L) 24F 6- Trigonal system Elements of symmetry Axis:1∆c ,) 3a1,a2,a3 ) Planes: 3m Center: + ve Crystalographic elements ( a1 = a2 = a3 ≠ c ) ,( α = β = 90 ≠ δ = 120 ) Crystal forms 1- Ditrigonal prism …..(hkw0) 6F 5- Rhombohedron….…….(h0hL) 6F 7- Scalenohedron……………..…… (hkwL) 12F 7- Cubic system Elements of symmetry Axis: ) 3a,b,c , 4▲ (م ع ا لمستويات6 ,ا ألركان Planes: 9m Center: + ve Crystalographic elements ( a = b = c ),( α = β = δ = 90 ) Crystal forms 1- Cube (hexahedron) ……….(100) 6F 2- Octahedron..……….(111) 8F 3- Rhombododecahedron..……(110)12F 4- Trisoctahedron..….……(hhL) 24F 5- Tetrahexahedron ……………(hk0) 24F 6- Hexaoctahedron…..…………(hkL) 48F