Crystal Structure of Materials Semiconductor Physics Laboratory FUNDAMENTAL

재료공학기초실험 재료의 결정구조 (Crystal Structure of Materials) Semiconductor Physics Laboratory

FUNDAMENTAL SOLIDS AMORPHOUS CRYSTALLINE Atoms in an amorphous solid are arranged randomly- No Order Atoms in a crystalline solid are arranged in a repetitive three dimensional pattern Long Range Order All metals are crystalline solids Many ceramics are crystalline solids Some polymers are crystalline solids Semiconductor Physics Laboratory 1

lattice(격자) Lattice -- points arranged in a pattern that repeats itself in three dimensions. The points in a crystal lattice coincides with atom centers. (3차원적으로 반복되는 형태로 배열된 점. 결정격자 내에서 점은 원자의 중심과 일 치한다. ) Lattice Unit Cell Semiconductor Physics Laboratory 2

Lattice parameters are a, b, c, , , are called the lattice Parameters. Semiconductor Physics Laboratory 3

방향지수 Algorithm z y 1. Vector repositioned (if necessary) to pass through origin. 2. Read off projections in terms of unit cell dimensions a, b, and c 3. Adjust to smallest integer values 4. Enclose in square brackets, no commas [uvw] x ex: 1, 0, ½ => 2, 0, 1 => [ 201 ] -1, 1, 1 => [ 111 ] where overbar represents a negative index Semiconductor Physics Laboratory 4

방향지수 [111] [120] [110] Semiconductor Physics Laboratory 5

방향지수 Semiconductor Physics Laboratory 6

Crystal system Semiconductor Physics Laboratory 7

원자충진율 Semiconductor Physics Laboratory 8

원자충진율 : 채심임방격자 Semiconductor Physics Laboratory 9

원자충진율 : 면심입방격자 face Semiconductor Physics Laboratory 11

원자충진율 ? ? -> report~ ^^ Semiconductor Physics Laboratory 13