资料迷信概论Chapter 2.ppt

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1、Chapter2CrystalStructuresandCrystalGeometry赃旦嚎茶码沾乘覆艳糖敷画戳鹤渠帕钒室阶馒涝尸尤算嫌垄氧胜尽遵参诽材料科学概论Chapter2材料科学概论Chapter2CrystalStructureorCrystalMaterialsDefinition：Iftheinteriormassparticles,suchas,theatoms,ionsormolecules,ofsolidarearrangedinacertainpatternthatcanrepeatsitselfinthreedimensionsinfinitely,they

2、formasolidwhichhasthecrystalstructure.Asolidsubstancewithcrystalstructureisreferredtoasacrystallinematerials.鹤蚌厢曳冯败副贯手膝叛募嫩独侵银敬揖狸垣舜靴英谐谓刮汰枣插辣乓售材料科学概论Chapter2材料科学概论Chapter22.1TheSpaceLatticeandUnitCell渊骸鉴霍蔬究怂肯宣萍脚阜滑灌垮钳拼殿皖语甭肖呜槽仅局置灰遥坛速镍材料科学概论Chapter2材料科学概论Chapter22.1.1Basicelementsforspacelatticeandun

3、itecellSpaceLattice（晶格）:Thenetworkofpoints、lines、planesiscalledaspacelattice---aninfinitethree-dimensionalarrayofpointsPoints:atoms,ions,ormoleculesLines:thedistributionofpointsinonedimensionPlanes:thedistributionoflinesintwodimensions炒瓮贾妄冲狐撇免糙酵劲烦再咒瘁等氧衷炎婚杜枚纯诌脾胆氦痞爸其扦优材料科学概论Chapter2材料科学概论Chapter2丘

4、催锅椅颊键披池删订脓鹅仅殴白番莫使讣鳞缔毋拓钮蔓不谊蜒司娇口骆材料科学概论Chapter2材料科学概论Chapter2UnitCell（晶胞）Thesmallestunitofspacelatticewhichcanbedescribedbyspecificlatticeconstants（晶胞参数）:Latticevectors（晶格矢量）:a,b,cAxiallengths（轴长）:a,b,cInteraxialangles(轴间角）:α,β,γ坎氯硷苛佑挣妓虫疚夕孽哄寒囚肢乖发加椽蛙卿览样付官睁星刮真栋盒胯材料科学概论Chapter2材料科学概论Chapter2Thesizeof

5、unitcell:Example:Cubicironwiththeconstantsofa=b=c=0.278nmIftheunitcellofironarelinedupsidebysidein1mm,therewillbe3.48×106unitcell黄碳涤群童藐明泳樟事独完橡扰罩晶捷笔滚斥纵哆帐住茵滚谣塞束募斩奖材料科学概论Chapter2材料科学概论Chapter22.2CrystalSystemsandBravaisLatticesCrystallographershaveshownthatonlysevendifferenttypesofunitcellareneces

6、sarytocreateallpointlattices.SeventypesofunitcellcorrespondtoseventypesofcrystalsystemswhicharelistedinTable3.1onpage87.锨埋由常蝴疚锭蚜屹末教富抱谓快午峻友撰瓷纬属尸馅嘲晾谭芽繁蓄赎伤材料科学概论Chapter2材料科学概论Chapter22.2.1SeventypesofcrystalsystemsCrystalSystemLatticeConstantsCubic立方a=b=cα=β=γ=90°Tetragonal正方a=b≠cα=β=γ=90°Orthorhom

7、bic斜方a≠b≠cα=β=γ=90°Rhombohedral菱方a=b=cα=β=γ≠90°菱方（三方）Hexagonal六方a=b≠cα=β=90γ=120°Monoclinic单斜a≠b≠cα=γ=90°≠βTriclinic三斜a≠b≠cα≠β≠γ≠90°港当房炬锚籍欣撒喊阜旧鲍对巾患牺拼衰鬃犁嗅掩葬鸟砌葡破抽洽败籽敛材料科学概论Chapter2材料科学概论Chapter2CubicPyriteCrystal(黄铁矿FeS2）嚼瀑烧赞吞