Chapter2StructureofMaterials课件.pptx

Chapter2 Structure of Materials;防水服;材料的疏水性;材料的疏水性;Relationship;Chapter2 Structure of Materials;7;8;Chapter2 Structure of Materials;10;Chapter2 Structure of Materials;12;Chapter2 Structure of Materials;14;;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;键的离子特征 当两成键原子的电负性相差较大时，共用电子对强烈偏向电负性大的原子，这时的键就带有离子键的性质。 离子特征的判断： 电负性差 ??1.7时：主要形成离子键 ??1.7时：倾向于形成共价键 鲍林公式——离子特征百分率（percent ionic character） ;【例1】利用鲍林公式计算半导体化合物GaAs和ZnSe的离子特征百分数。其中Ga、As、Zn、Se的电负性分别为1.8、2.2、1.7和2.5。;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;势能阱示意图;3/31/2016 10:28:48 AM;例：NaCl的键能计算;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;晶态与非晶态之间的转变;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;57;简单菱方;底心单斜;简单正交;体心立方;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;Chapter2 Structure of Materials;PROBLEM: Draw the following direction vectors in cubic unit cells: a. [100] and [110] b. [112] c. d. ;Solution;Chapter2 Structure of Materials;;Chapter2 Structure of Materials;？;Chapter2 Structure of Materials;3/31/2016 10:29:30 AM;Chapter2 Structure of