kristal yapilar ve yapi kusurlari

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  • 8/2/2019 Kristal Yapilar Ve Yapi Kusurlari

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    Blm 3: Kristal Yaplar veYap Kusurlar-1

    Bu blmde

    birim hcre, kristal yap ve eitleri,

    katlarn trleri,

    katlardaki bozukluklar, dislokasyonlar

    hakknda bilgi verilecektir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Kristal Yaplar Kristal yapl malzemelerde atomlar boyutta, belirli

    bir dzene gre dizilerek bir hacim kafesi olutururlar.

    Kristal yapl malzemelerde hacim kafesini oluturan,basit geometrikekillere birim hcre veya birim kafes,atom veya atom gruplarnn bulunduu yerlere dekafes noktas denilir.

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    Yedi Kristal Sistemi

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    Yedi Kristal Sistemi (devam ediyor)

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Metal malzemeler, ok zel durumlardnda, daima kristal yapya sahiptirler.

    Metallerde en ok;

    Yzey Merkezli Kbik (YMK),

    Hacim Merkezli Kbik (HMK) ve

    Sk Dzenli Hegzagonal (SDH) yaplara

    rastlanlr.

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    Yzey Merkezli Kbik Kristal Yaplar

    Birim hcrenin her kesinde ve yzeylerin merkezlerinde

    birer tane atom bulunmaktadr.

    -Fe, Cu, Al, Pb, Ag, Au bu tip kristal yapya sahiptirler.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    2 2a R

    Yzey merkezli kbik kristal yaps, kpn kenar uzunluu

    ve birim hcresi. Kpn kenar uzunluu: dir.

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    a

    a da

    2

    + a2

    = d2

    d = (2)1/2 a

    4 R = (2)1/2 a

    Kbik Yzey Merkezli Kafes

    a = 2 R (2)1/2

    R

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Bir atoma temas eden veyaen yakn konumda bulunankomu atomlarn saysna

    koordinasyon says denir.

    Yzey merkezli kbikkristallerin koordinasyonnumaras 12dir.

    Her bir hcredeki atom says4tr.

    nk 6 yzey atomu iki

    hcre tarafndan (6/2=3), 8 ke atomu ise 8 hcre

    tarafndan (8*1/8=1)paylalmaktadr.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Atomsal dolgu faktr (ADF), kristal kafes

    yapsndaki dolulukorann gstermektedirve birim hcredeki atomlarn toplamhacminin, birim hcrenin hacmineblnmesiyle bulunur.

    Yzey merkezli kbik kristal kafesyaplarnda ADF en fazla 0.74 olabilir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    KYM kafeste Atomsal Dolgu Faktr

    ADF = Birim kafesteki atomlarn hacmibirim kafesin hacmi

    Ka tane atom vardr?

    Atomlarn hacmi nedir?

    Kbn hacmi ne kadardr?

    R ile aarasndaki iliki nedir?

    ADF, Rden bamszdr.

    4 atom/kp

    4 x 4R3/3

    a3

    ADF =(16R3/3)/a3 = 0.74

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Hacim Merkezli Kbik Kristal

    YaplarBu tip kristal kafes

    yaplarnda kbik birim

    hcrenin her kesinde vemerkezinde birer tane atom

    bulunmaktadr.

    Cr, -Fe, Mo, W, V, Na, Kbu tip kristal yapya

    sahiptir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Hacim Merkezli Kbik Kristal Yaplar ve birimhcrenin kenar uzunluu

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Bu tip yaplarn koordinasyon says 8dir.Her birim hcredeki atom says n=2dir.

    nk kelerdeki 8 atom, 8 hcre tarafndanpaylalmaktadr (8*1/8=1).

    Merkezdeki atom ise hibir hcreylepaylalmaktadr.

    Dolaysyla 1+1= 2 atom vardr.

    Atomsal dolgu faktr 0,68dir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Sk Dzenli Hegzagonal (SDH)

    Yaplar

    Merkezde 1 atom ve bunu evreleyen dzenli altgeneklindeki 6 atomdan meydana gelir. Birim hcresinin ortasnda bulunan dzlemde

    (c ekseni) ise 3 tane ek atom daha bulunmaktadr.Cd, Mg, Zn, Ti bu tip kristal yapya sahiptir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    SDH kafes, merkezde 1 atom ve bunu evreleyendzenli altgen eklindeki 6 atomdan meydanagelir.

    Birim hcresinin ortasnda bulunan dzlemde(c ekseni) ise 3 tane ek atom daha bulunmaktadr.

    Mg, Cd, Be, Zn, Ti, Zr bu tip kristal yapya

    sahiptir.

    Bu tip kristal yaplarn koordinasyon says 12dir.

    Atomsal dolgu faktr 0,74tr.

    Birim hcrenin a ve c olmak zere iki kafesparametresi vardr. c/a nn ideal oran 1,633dr.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    KYM birim hcrede 4 atom bulunur ve KS = 12 dir.

    SDH -birim hcrede 6 atom bulunur ve KS = 12 dir.

    KHM birim hcrede 2 atom bulunur ve KS = 8 dir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Younluk Hesaplamalar

    Kristal malzemelerin younluu u formlle

    hesaplanr:

    Birim hcredeki atom says (n): n= 2 (HMK), n= 4 (YMK), n=6 (SDH)dr.

    ( , ) ( , )

    ( , )

    c

    birim hcrenin yo unluu n bir atomun ktlesi M

    Hcrenin hacmi V

    (Birim hcredeki atom says, n)

    n :birim hcredeki atom says, Vc: birim hcrenin hacmi

    A:atom arl, NA

    :Avogadros number (6.023 1023 atom/mol)

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    PROBLEM:

    a)A:63.5 g/mol, r:1.278 0A olduuna gre, KYMbakrn teorik younluunu hesaplaynz.

    Cevap: 8.94 g/cm3

    b) Bakrn atomsal dolgu faktrn hesaplaynz.

    ADF: Birim kafesin atomlar tarafndan

    doldurulma orandr.

    Cevap: 0.74

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    Polimorfizm ve Allotropi Baz metal ve metal olmayan malzemeler ayn

    bileime sahip olmakla birlikte, scaklk vebasncabal olarak birden fazla kristal yapyasahip olabilirler. Bu olgu polimorfizmolarakadlandrlrlar.

    Eer malzeme bir elementsel kat ise budurum, daha ok allotropi olarakadlandrlr.

    Kristal yapnn deimesinin bir rneikarbondur. Karbondan normal artlar altndagrafit elde edilirken, olduka yksekbasnaltnda elmas elde edilebilmektedir.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Demir de oda scaklnda KHMliyapdayken, 912 0Cda KYM kristal

    yapyadnr.

    Hegzagonal BN, kbik BN...

    Polimorfik dnmlerle, younluk vedierfiziksel zellikler de deiir.

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    Tek Kristalli ve ok Kristali

    Malzemeler Tek kristalli malzemelerde atomlar tm

    malzemenin uzantlarnda tekrarlanr yada

    bir periyodiksradadr.

    ok kristalli malzemeler ise ok kkkristallerden yada tanelerden olumaktadr.Taneler farkl kristalografik ynelimesahiptirler.

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Kristal ve Kristal Olmayan Malzemeler

    Tek kristal

    Poli kristal malzemeler

    Anizotropi ve izotropi

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Tanelerin bulutuu blgelerde uyumayanatomlar vardr. Bu blgeler tanesnrlar olarakadlandrlrlar.

    ok kristalli malzemelerde tane snrlar

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    Kristalin Olmayan (Amorf) Katlar Amorfkatlarda uzun mesafeli bir dzen yoktur.

    Ksa mesafeli dzen olabilir. Baz seramikler, rnein camlar ile plastik

    malzemeler amorfyapldrlar.

    Ar hzla soutulmu metaller de amorf yapl

    olabilirler.

    a. Amorf yapya sahip SiO2nin ematik resmi

    b. Amorf yapnn simlasyonu

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt
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    a) Amorf yap b) Kristal yapda tane snrlar

    (taneler dzensiz) (snrlardaki taneler dzensiz)

    http://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppthttp://../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/Temporary%20Internet%20Files/Content.IE5/SHUBCDMF/SHOW.ppt