Download - 4.Some of Important Crystall Structure
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7/23/2019 4.Some of Important Crystall Structure
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
G. AiHc Xtruhturb TGfagh hflpfuam Ai
+
, Hc
gfas\ >
9. Af. fo Itfl Ubr Ragt Hbccs >
]jbrb irb : Ai +gfas it tjb hfrabr iam bihj hfrabr itfl sjirbm `y : uagt hbccs.
Jbahb hfatrg`utgfa fo hfrabr itfls gs (g.b.9: :
Ga AiHc, kgvba iagfa gs surrfuambm y ?hitgfas fr vghb-vbrsi. Jbahb,
Xflb hfllfa litbrgic cgdb LkF, ObF, CgO bxjg`gts tjgs struhturb.
.
< = Ai + = Hc < :
Hf-frmgaitgfa Aul`br < ?
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
8. Itflgh Pimgus r) >
Orfl Ogk.
i < 0r+ + 0r0r+ < Pimgus fo Ai+0r < Pimgus fo Hc
[b hiat tidb rimgus r `bhiusb rimgus fo Ai+& Hc irb mgoobrbat.=. Itflgh Uihdgak Oihtfr >
Itflgh pihdgak Oihtfr
i) ]jb spihb cittghb fo AiHc struhturb gs OHH, wgtj `isgs hfasgst fo Ai+iam Hc, Fabcfhitbm it cittghb pfgat (5, 5, 5) iam ftjbr it fab jico fo tjb `fmy mgikfaic fo tjb
hu`b.
`) ]jb struhturb liy icsf `b vgbwbm is ia gatbrpbabtritgfa fo twf OHH su`-
cittghbs, fab hflpfsbm batgrbcy fo Ai+gfas jivgak tjbgr frgkga ith) (5, 5, 5) iam fab hflpfsbm fo
Hcgfas jivgak tjbgr frgkga it , siy, i
0 ,5,5
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
m) ]jbrb irb =-lfcbhucbs it AiHc.
b) Ga tjb ofrlitgfa fo AiHc hrystic, Ai-
itfl cfsbs gts futbrlfst
biam ihqugrbs
i bxhbssgvb +vb hjirkbs wjgcb Hc-itfl ihhbpts fab b orfl Ai iam, ihqugrb vbhjirkb .
o) ]jbrb irb bcbhtrfstitgh ofrhb fo ittrihtgfa `btwbba tjb fppfsgtb hjirkbs iam
strfak rbpucsgvb ofrhbs `btwbba tjb bcbhtrfagh sjbccs fo twf gfas wjba tjby
hflb hcfsbr.
k) [jba ittrihtgvb iam rbpucsgvb ofrhbs `iciahb, bqugcg`rgul, rbihjbm, rbsuctgak
ga sti`cb struhturb.
Glpfrtiahb fo sti`cb struhturb.
GG. Mgilfam Xtruhturb TOHH\ >
Hir`fa itfl fambm tf ofur ftjbr hir`fa itfl tf hfvicbat famgak.
9. Af. fo Itfls Ubr Ragt Hbcc >
Ga mgilfam struhturb, tjbrb irb bgkjt hfrabr itfls, bihj hfrabr itfls sjirbm
`y :-uagt hbccs. Jbahb tjb hfatrg`utgfa fo oihb habtrbm itfl gs 9.
(g.b.9:: < 9 )
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
Iam tjbrb irb = gasgmb itfl wjghj gs aft sjirbm `y iay ftjbr uagt hbcc
Jbahb a < 9 + 8 + = < :
Af.fo itflsRagt hbcc < :
0. Hf-frmgaitgfa Aul`br HA) >
Ofr iay hfrabr itfl fo mgilfam, tjrbb abirbst abgkj`furs irb oihb batbrbm
itfl iam fab abirbst abgkj`fr gs gasgmb itfl `bcfakgak tf tjit hfrabr itfl.
Jbahb,
Hf-frmgaitgfa Aul`br < =
Ofr iay hfrabr itfl fo mgilfam, tjrbb abirbst abgkj`furs irb oihb batbrbm
itfl iam fab abirbst abgkj`furs gs gasgmb itfl `bcfakgak tf tjit hfrabr itfl.
Jbahb, Hf-frmgaitgfa Aul`br < =
8. Itflgh Pimgus r) >
Ga @hh, `fmy hbatbrbm itfl tfuhjbs tf tjb hfrabr itfls iam hfrabr itfls mf
aft tfuhj tf bihj ftjbr.
Orfl Ogk.
I@
Itflgh pihdgak Oihtfr
_fgm Xpihb < 9 IUO< (9 5.8=)< 5.??
2. Uihdgak Booghgbahy >
Uihdgak booghgbahy < IUO 955%
< 5.8= 955%
< 8= %
_fgm Xpihb < 5.??
Uihdgak booghgbahy < 8=%
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
GGG. ^gah Xucpjgmb T^aX\ >
i)
]jb struhturb fo ^gah sucpjgmb gmbatghic tf tjb Mgilfam Hu`gh struhturb.
`) ]jgs gs ia gfagh hflpfuam.
h) ]jb @rivigs cittghb fo ^aX gs i oihb hbatbrbm hu`gh TOHH\
m) Gt hfasgst fo twf gatbrpbabtritgak OHH Xu`-cittghb wjghj irb fhhupgbm `y twf
mgoobrbat bcblbats iam irb mgspcihbm orfl bihj ftjbr `y fab quirtbr fo
`fmy mgikfaic.
b) ]jbrb irb ofur ^aX lfcbhucbs Ofr uagt Hbcc.
9. Af. fo Itfl Ubr Ragt Hbccs>
Hichucitgfa ofr ^a >
Hfatrg`utgfa fo hfrabr itfls gs (g.b.9: :
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
0. Hf-frmgaitgfa Aul`br HA) >
Ga ^aX, kgvba hitgfa gs surrfuambm `y = iagfas fr vghb-vbrsi. Jbahb,
8. Itflgh Pimgus r) >
Jbahb, X-prbsbat it9=tj fo `fmy mgikfaic
r^ + r < 9=8 i
=.
Itflgh Uihdgak Oihtfr >
Itflgh pihdgak Oihtfr
i)
Hfasgmbr i ciybrs fo sglgcir itfls wgtj bihj itfls surrfuambm y ? itfls ga
fab pciab. (ciybr I) .
`) Iaftjbr sglgcir ciybr @ hia `b pcihbm fa tfp fo ciybr I suhj tjit tjb itfls fo
ciybr @ fhhupy tjb ictbraitb viccbys ofrlbm `y tjb itfls fo ciybr I.
h) Go i abw ciybr gs pcihbm fa tfp fo tjb @-ciybr suhj tjit bihj itfl fo gt gs bxihtcy
i`fvb tjb itfls fo ciybr I, tjba tjgs abw ciybr wgcc `b bxihtcy gmbatghic tf tjb ciybr
I & tjgs typb fo stihdgak gs rbpbitbm suhhbssgvbcy .
m) ]jb ofccfwgak ciybrbm irriakblbat gs f`tigabm.
---------- I@I@I@ ---------------
b) ]jgs typb fo stihdgak gs hiccbm JHU stihdgak & tjb struhturb gs dafwa is Jbxikfaic hcfsb pihdbm struhturb.TAftb > Ga OHH tjb tjgrm ciybr gs aft gmbatghic tf I
--------------- I@HI@HI@H -------------- \
Jbxikfaic Hcfsb Uihdbm Xtruhturb TJHU\ >
Jbxikfaic hcfsb pihdbm (JHU) struhturb gs fab fo tjb lfst lbticcgh struhturb
i`fut 02 lbtics bxjg`gt tjgs struhturb.
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
9. Af. fo Itfls Ubr Ragt Hbcc >
Ga JHU, bihj hfrabr itfls fo jbxikfaic oihb gs sjirbm `y sgx uagt hbccs. Jbahb tjb
mgstrg`utgfa fo hfrabr itfls gs. ]jbrb irb sgx hfrabr itfls fa bihj oihb. (g.b
uppbr iam cfwbr oihb)
]jbrbofrb hfatrg`utgfa fo hfrabr itfls tf tjb uagt hbcc
Ofr iay oihb hbatbrbm itfl, tjbrb irb ?-abirbst abgkj`furs ga silb jbxikfaic
pciab, 8-abirbst abgkj`furs irb i`fvb tjb pciab & 8-abbirbst abgkj`furs irb
`bcfw tjb pciab.
Jbahb,
Hf-frmgaitgfa Aul`br < 90
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
8. Itflgh Pimgus r) >
]jb itfls irb ga hfatiht icfak tjb bmkbs fo jbxikfaic.
i < 0r
r < i0
2. Itflgh Uihdgak Oihtfr >
Itflgh pihdgak Oihtfr
_fculb fo Jbxikfa < Irbi fo `imb jgkjt fo hbcc ---(0)
Irbi fo @isb < ? Irbi fo I@H
Irbi fo I@H < `isb jbgkjt ---(8)
Mriw rIM tf @H .
Xga ?5 < <
Itflgh Pimgus
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HPWX]ICCFKPIUJW GAMPF]RH]GFA ]JBPFW
Jbgkjt fo ,IM < i sga ?5
IM