kristal yapilar ve yapi kusurlari
TRANSCRIPT
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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.
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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)
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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.
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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
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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.
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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.
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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
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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.
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Hacim Merkezli Kbik Kristal Yaplar ve birimhcrenin kenar uzunluu
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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.
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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.
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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.
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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.
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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.
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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.
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Kristal ve Kristal Olmayan Malzemeler
Tek kristal
Poli kristal malzemeler
Anizotropi ve izotropi
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Tanelerin bulutuu blgelerde uyumayanatomlar vardr. Bu blgeler tanesnrlar olarakadlandrlrlar.
ok kristalli malzemelerde tane snrlar
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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
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a) Amorf yap b) Kristal yapda tane snrlar
(taneler dzensiz) (snrlardaki taneler dzensiz)
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