●a Chapter vil solid State 2D LATTICE Translational vector Atom1:(0.0) 2(23,1/3) Unit cells Atm1:(2/g,1/) Atom2(1/34/3) FrAC!IONAL Atomic Ayaadinates As fraction of unit cell dimension) ie true dimensions are ar and l7 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chapter VII Solid State 2021/8/21 Chemistry Department of Fudan University 21 Translational vector
●a Chapter vil solid State fractional coordinates .The positions of atoms inside a unit cell are specified using fractional coordinates (x, y, z) These coordinates specify the position as fractions of the unit cell edge lengths 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chapter VII Solid State 2021/8/21 Chemistry Department of Fudan University 22
●a Chapter vil solid State quare Rectangular Centered Rectangular NP Hexagonal Oblique 5 Bravais lattice in 2D 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chapter VII Solid State 2021/8/21 Chemistry Department of Fudan University 23 5 Bravais Lattice in 2D P P NP
●a Chapter vil solid State Square a=b Y=90 Rectangular a≠b|r90 Centered a≠by=90 Rectangular He exagonal a=b y=120 oblique a≠b 90 5 Bravais Lattice in 2D 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chapter VII Solid State 2021/8/21 Chemistry Department of Fudan University 24 Square a=b =90 Rectangular a b =90 Centered Rectangular a b =90 Hexagonal a=b =120 Oblique a b 90 5 Bravais Lattice in 2D
●a Chapter vil solid State attice planes and Miller Indices Imagine representing a crystal structure on a grid (lattice) which is a 3D array of points (lattice points). Can imagine dividing the grid into sets of planes in different orientations 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chapter VII Solid State 2021/8/21 Chemistry Department of Fudan University 25 Lattice Planes and Miller Indices Imagine representing a crystal structure on a grid (lattice) which is a 3D array of points (lattice points). Can imagine dividing the grid into sets of “planes” in different orientations