《固体物理学》课程教学课件（PPT讲稿）Chapter 1 Crystal Structure（Supplement - microstructure and crystal system）

1-1 Supplement microstructure and crystal system Monoclinic (2/m) ·Monoclinic P lattice 。a丰b卡c, ·a=B=90°≠y b

1-1 Supplement :microstructure and crystal system • Monoclinic P lattice • a ≠ b ≠ c, • α = β = 90˚ ≠ γ a b c γ Monoclinic （2/m)

Monoclinic C lattice P lattice

• Monoclinic C lattice P lattice

·Monoclinic B lattice ·No2 or m For P lattice 。No P lattice for Monoclinic

• No 2 or m For P lattice • No P lattice for Monoclinic • Monoclinic B lattice

Monoclinic I latticeB lattice

• Monoclinic I lattice B lattice

·Monoclinic F lattice〉I lattice)B lattice

• Monoclinic F lattice I lattice B lattice

Octahedral and Tetrahedral Holes Tetrahedral Interstitial Site (Hole) Octahedral Interstitial Site (Hole)

Octahedral Tetrahedral Holes (CCP) Octahedral Holes Tetrahedral Holes Space Group Fm3m Space Group Fm3m Atom Site x Atom Site× Y Z Anion 4a 0 0 Anion 4a 0 0 0 Oct Hole 4b Tetr Hole 8c

One example of more complicated crystal structure Perovskite Type Structure ABO3 A-cation: cubic lattice B-cation: body centered O-anion: face centered oxidation state examples II/IVA2+/B啊 BaTiOa Pb(Zr,Ti)O3 11V A*/B5网 KTaO3 II/Il川A3*/B3+ LaMnO3 application:nonlinear resistors(PTC),SMD-capacitors,piezoelectric sensors and actuators,pyro-detectors,ferroelectric memory SMD:Surface Mounted Devices

SMD: Surface Mounted Devices