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[공대]결정구조(Ⅰ. Lattice Geometry)

저작시기 2006.08 |등록일 2006.09.11 한글파일한글 (hwp) | 5페이지 | 가격 1,000원

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목차

1. Introduction (Overview)
2. Two-dimensional Symmetry
a) Lattice, unit cell
b) Symmetry Operations
c) 2-dimentional point group(10)

본문내용

1. Introduction (Overview)
∎ Crystals(結晶) : an anisotropic body consisting of a three-dimensional
periodic arrangement of atoms, irons or molecules.

↔ amorphous(glass state)
- isotopic : equal physical properties in all direction.

2 1
2

∎ Characteristics
1) regular geometric shape : consisting of polyhedral faces that express
an internal structure, manifested by symmetry operation of atoms and
molecules.
2) anisotropic physical properties bright yellow
- pleochroism "cordierite"
- hardness blue
- cleavage-bond strength blue grey
3) defects are involved in atomic arrangement : there defects determine
the major physical, mechanical and electronic properties of materials
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