晶体学历年试题汇总.doc

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1、1.Thereare10statementsbelow.Ifthestatementisright,pleasemarka“√”inthebracketafterthesentence.Ifthestatementiswrong,marka“×”inthebracket.(10points)(1)Thesymmetryclassescharacterizingfiguresorobjectswhichhaveatleastonesingularpointarecalledpointgroups.()(2)Therear

2、eatleasttwolatticepointsinaprimitivecell.()(3)Five-foldrotationalaxiscannotbefoundinanycrystallinematerial.()(4)Octahedronisakindofclosesimpleform.()(5)ThesymmetrynotationC3iscalledtheHermann-Mauguinnotation.()(6)Pointgroup6mmbelongstothecubiccrystalsystem.()(7)

3、Inatetragonalcrystalsystem,thelatticeparametershavetherelationa≠b＝c,α=β=γ=90°.()(8)Thecoordinationnumberoftheface-centeredcubiccrystalstructureis8.()(9)Hexagonalpyramidisasimpleformofthetetragonalcrystalsystem.()(10)Monohedronisakindofopensimpleformsoitcannotbes

4、eenonthecrystalsofthetetragonalcrystalsystem.()(11)Five-foldrotationalaxiscanbefoundincrystallinematerials.()(12)Thecoordinationnumberoftheface-centeredcubiccrystalstructureis12.()(13)Pointgroup4mmbelongstothecubiccrystalsystem.()(14)Spacegroupisakindofobject.()

5、(15)Inatetragonalcrystalsystem,thelatticeparametershavetherelationa＝b≠c,α=β=γ=90°.()(16)Thereisonlyonelatticepointinaprimitivecell.()(17)Cubeisakindofopensimpleform.()(18)ThesymmetrynotationD4hiscalledtheHermann-Mauguinnotation.()(19)Tetragonalpyramidisasimplefo

6、rmofthehexagonalcrystalsystem.()(20)Monohedronisakindofopensimpleformsoitcannotbeseenonthecrystalsofthehexagonalcrystalsystem.()2.Analyzeeachpatternoftheone-dimensionalspacegroupsbelow.Drawthesymmetryelementsineachpatternandwriteouttheinternationalnotationofthos

7、epatterns.(10points)(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)3.Analyzeeachpatternofthetwo-dimensionalspacegroupsbelow.Drawtheoutlineofeachunitcellandthesymmetryelementswithintheunitcellofeachpattern.Writeouttheinternationalnotationofeachgroup.(15points)4.Analyzeth

8、esymmetryelementsofeachfigurebelow.DrawthestereographicprojectionsofthesymmetryelementsandwriteouttheSchoenfliesnotationsandtheinternationalnotationsofeachfigure.(20p