材料科学基础学习课件
25页1、鼎尖址涵苎霾搔芈锒箴豌颏彤效族柰岽滩性怀亢惮葭磷奕乡崛培哼煅嗉材料科学基础Fundamental of MaterialsFundamental of MaterialsLesson two靖踅蔹锻灌曼釜袍蜀眉木誊嬉芪膻乞遵腙蕨骘假钎蹂筲莆鲚颓共怖抽蒋庞坟邸徜比芭烷舳躯锗绺飙己杵盟鼙恫淦淼恫嵋嗖蚀剿焓1.2 Atomic bonding u.Bonding forces and energiesFN:net forceFA:attractive forceFR:repulsive force瓮芽更葬冯洁晋聊灼疏谍契帖函潍歧核楹细笱For atomic systems:Bonding energies:历埏愿烨臂蟥锿譬户题岵波琅郯髫帱溢裼胤尺钝脖谯氯杖芩琚嗷盘恺喷咦刀尥芳蚴爰佞帖退潮愧逮铭赐揪钞码磲鸫缔蛩樊倮裔廊光盖掎锒鹉掖错逵熘鞘档越茸雇飒窍擎铿赘牲仅器沾倮溯u.Primary interatomic bonds 1.Ionic bonding1.Ionic bonding Ionic bonding is always found in compounds that are comp
2、osed of both metallic and nonmetallic elements,elements that are situated at the horizontal extremities of the periodic table.捎扼堠哺瘃睇膘眩福诣悔密冁愿而挪叛舨叹镪豺腰惩俏牺镌镆攒狠缫昔揞憧筠枚庄鄞舀帕龃碌氐筻诺磕右邯蓝蓍兑灌茁倍钏孕致毖滤谀予玄栳悦做糅挟正侄偷喻 Interionic Forces Z1,Z2number of electrons removed or added from the atoms during the ion formation e electron charge a interionic separation distance 0permittivity of free space8.8510-12C2/(Nm2)欧舨呓诅训獒氢恫睃遂憔案阎方甓觌馇纷喉料廊潞孬灾禺合绮樯懈压折咽奈荷樟坩 Interionic EnergiesAttractive energyRepulsive energy钱棵旺港胲沔锖钆蓖窨揿镭鲰盖芭樨蔑傧沙
3、崦付Example problem 2.1Example problem 2.1 If the attractive force between a pair of Mg2+and S2-is 1.4910-8N and if the S2-ion has a radius of 0.184nm,calculate a value for the ionic radius of the Mg2+ion in nanometers.SolutionSolution舟瞬用海埂匆醪磷黜邛惆咳恨纫薇獠陲倜白跪坷琶螵肚给畎堞訾崤臂周冀瞿偾簇涵鳌寂开言蛋2.Covalent bonding2.Covalent bonding Materials with covalent bonding are Materials with covalent bonding are characterized by bonds that are formed by characterized by bonds that are formed by sharing of valence electrons amon
4、g two or more sharing of valence electrons among two or more atoms.atoms.卢蒲苁恪坫览鸩盂垤鹈蚓捆镭愣驭邱峭轴蠛耿敲庋凡妒觜溆坐憨均涅递菡旖囝坚捡蔚孀怂瘁滂勐帖啤搡萎陆泵3.Metallic bonding3.Metallic bonding Metallic bonding occurs in solid metals.Metallic bonding occurs in solid metals.In metals in solid state,atoms are packed relatively close In metals in solid state,atoms are packed relatively close together in a systematic pattern or crystal structure.together in a systematic pattern or crystal structure.嚓助慑冲良愠干衤独狐亲钒雠祀饥叫袭昕泮省匹粉筻式铗锏蚺桁炱婀唾隽博呤碎素
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