万物运行的奥秘要点

1、Inside of the Materials Question: Try to summarize the characteristic of the materials we have talked.Stick PackingBuilding Blocks of MaterialsQuestion: What are materials make of ?Structures and Properties, Story of battle array DiamondStructures and PropertiesGraphiteDiamondDiamond tetrahedral str

2、uctureEg5.0 eV，excellent thermal conductanceSuper-hardnessGraphite layer structureEg = 0.0 eV，excellent electrical conductanceVan de Waals interaction between layersStructures and PropertiesC60 (Fullerene)Carbon Nanotubes Crystalline structures depend on electronic structures of atomsHumans goal: Co

3、ntrolling Materials at atomic scale Question: Can we build solids (crystals) with designed structures?Materials with fcc (hcp) structuresMost of transition metals and noble metals, such as Cu, Ni, Au, AgSTM image of copper surfaceMaterials with bcc structuresSome metals: Fe (magnetic material)Applic

4、ationsGiant Magneto Resistive (GMR, 巨磁阻 )Materials with diamond structureColumn 4 materialsIII-V compoundsII-VI compoundsSi based devicesRealization of “0” and“1”Light-emitting diodesGaNEcEvhpnLight-emitting diodesLasershC bandV bandholeElectronActive regionp-typen-typeGaAs basedOptical communicationsDiamond: super-hardCoatingCutting toolsOxidesMeO2Superconducting Materials“High temperatur