Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Structure Studies of YBa,Cu,O,_JAg by XRD and SEM
73
82
FA
Y
N
The YBa2Cul07_6 (YBCO) superconductor
ceramic has low critil..lil current density (Jc) because or weak
linb between its grains. There have been a lot or effons to
increase Jl. One or Ihe methods to increase Jc is to dope
YBCO with other materials such as silver (Ag). In th is
paper. the effect of adding silver to YBCO with the weight
ratio of 0% 10%,15%. 20% and 30% on its
mil:rostrul:lure have been investigated. The X-ray diffraction
(XRO) ilnd scanning electron microscopy (SEM) and
energy dispersive spectroscopy (EDS) dj il gra Ul~ of ~ilmpb
hilvc been obtained and studied. The study of XRD patterns
shows 1ha1 Ag i~ l1 ppCilrs l iS a scparalc ph use in the sa mplc..c;
,.lOti the: position Ill' YBeQ peaks do nut considerable
l:hangcs. The study or SEM of samples rcveal~ that the Ag
ildtkd to YBea docs not prese nt in its micros tructure and
doc~ nnt t.;hangt.: the lattice constants of YBeO by
l:()n~lderllbk amount, and also thl: Ag grains remain among
YBCO grains ami providc the better intcrgnmular contact.
The pi..'rr.:l!nt<tl!~ 01 'iil'CI I'm optomll"mg the phy.;;(ill
pfllpCr1It.:~ 01 YBeQ ~upcn;()nducturcs i~ almost 20.
YBaICu l0 7_'" Superconductor, Silver, XRD and SEM
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Interpretation of Diffraction Patterns
and Crystal Structure Determination of
CdSe by Transmission Electron Microscopy
83
94
FA
Y
N
Single crystals of binary semiconducto r CdSe
were grown by subJimalion and conde nsation techniques
wing ca rrier argon gas. Powder X-ray diffraction as well as
Transmission e lectron microscopy o f powde red crystals
confiml Ihe cryslal st ructure to be hexagonal with :
a = 4.299 A, c = 7.010 A and space grope P6,MC
Crystal SIrUClUre, Transmission Eleclron Microscopy,
Diffractioll Paltems
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Occurrence 411\' Cobalt Mineralization in Tidar area - E(llid
95
108
FA
Y
N
The Tidtir CObHl1 deposit is Im.:alell IX km northwesl 01 Ihe I()wn ul
Eqliu, in Ihe S:tlwndaj - Sirjan zonc. Cobalt mincralil.ation occur:-. 111 a Ic
horizon)' concordant Wi lh, and within Ihe :-.cdmlcnlary detrital :-.equem.:cs of
limeslom:, sa nd)'lOnc and marl of upper jurassk (M,dm) age.
The main minerals arc magnclile and changing gradually 10 hemalite anu
then to limonite and g()clh ile. Co, Ni, Mn, Ti, A:-., bearing minerals also tlI..:cur.
These minerals represents an oxidized environment, hu whether coha lt
bearing pha~es, (Ire part or the ox idized zone or helong 10 an independent
sou rce underneath, is the subject of Ihis study.
Association of cobalt wilh Iron, man g~ n Ci>e and day mmcr .. h (),ta,cngcr
components) .lotrongly .loUpport thc hypOthc..i 01 ad:-.urbtioll. 11,,; ~ h:-.e lltc of
ullramafic oUlcrops. the Slratiform nature of mineralized horizons, the Inw Ph
and Zn content s, Ihe absence of indir..:ator minerals of reduced far..:ies, rejcr..:1
the known models of caha lt mineralization (skarn, laterilit, hydrothermal.
m<lgmatic and stratiform) for Tidar deposit
The weathered m3fie or ultml1afic plulon is probahly the primary source
of cahall; The free Cohalt released from thb pluton b transp0 rl cd to the
upper Jurassic :-.edimcnt al)' basin, or had been moved as a CObill! hearing
phase to the depos ition si le, where il was weathered and Co was releases. And
finall y, the free Cobalt ions ei ther were adsorbed on certain mineral grain s. or
INf' lI~r()~il (' d ;1~ amrlrphnllS eompollo(h fillin!! the ;,<vOIil;;blc open SPU(;CS,
Cubalt Mineralizatioll, Swface adsorh/ioll oj Co/)a/I,
Sanandaj - Sirjal/ Zone, Eqlid
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Study of Ni(OO) Surface Via l/E Curves in LEED Methods
109
120
FA
Y
N
The rcnccted beam intensity as a lunctlon of
dcclron energy ( lIE curve) is studied for an ideal (001) Ni
surface by low energy electron diffraction (LEED). Double
layer method, rcnormalized forward scattering (RFS) and
quasi-dynamic method arc used for lIE curves calculation.
The role of structural and nonstructural parameters of Ni
on lIE curves is examined. The crfect or the optical
potcnti .. , und numbcl o f scnltcrcd bcums on these curve:!
arc also studied.
LEED, Ni Sur/ace, Relaxation
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Reaction of Nitric Oxide with Cu(lll) Single Crystal
121
132
FA
Y
N
The adsorption of nit ric oxide on a Cu(1l1) surface
has been studi ed using X-ray photoelectron (XPS) and high
resolution e lectron energy loss spectroscopies (HREEL) in the
tcmpenllurc range 80-410 K. Nitricoxide had no interacation
with surface at room tempe rature, while it was adsorbed
molecularly on un an nealed Cu surface and then dissociated to
ni trogen and oxygen atoms. Exposure of surface to NO at 80K
showed mo lecular adsorpt ion of NO and N20. The exposure
dependent HREEL spectra of NO at the clean Cu su rface at
80K and for subsequent warming up to room temperature
showed loss peaks at 344 em-I, 680 em-I, 1525 em-I, 1830 em-I,
and 2140 em-I. The vibrational mode at 1830 cm-l was ass igned
to N-O stretch of NO handed in a lOp position, the 1525 cm-l
loss peak was attributed to the N-O stretch of NO honded in
two fold bridge sites, the loss peak at 680 cm-l was assigned to
a bending mode of NO(adS) the loss peak at 2140 em-I was due
to (N-N) stre tChing mode of N20 formed. The intense feature
at 344 em-I was identified as the Cu-NO stre tching mode_
Adsorptioll of Nitric Oxide, X-ray photoelectron
speclfoscopy (XPS), High resolution eleclron energy loss
spectroscopy,
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
2
1999
10
1
Determinatiun uf Firing Temperature
of Pottery , Brick and Tile by XRD and STA
133
142
FA
Y
N
Ccrumic refers to all fircd products incl uding pou ery,
hrick. and tile that is primarily composed of clay with different
iJlllo unts of o ther materia ls thaI have a source from soil and
when they lired .produced a hard material. Firing the clay body
to the hanJness of ceramic hody is the next critical stage in
manufm:turing.
To de termine the firing te mperatu re. four lired (450, 600.
850. 1000°C) togc ther with unfin..:d day samples were studied,
usmg XR 0 and STA methods. and then an unidentified tiring
temperature sample was examined. Format ion of new mi ne rals
in the temperature... m("ntioned above and the stage o f
l:arhonah::s e hmin<ltion can he (h;:termined with X RD. but to get
a h~th,;r n,;:»u lt, :-opcl:Lally for tho:»e samples which fired
tl:lllpL:ratur.! is nearly oOt/°C. it is necc:»s.lry 10 usc STA melhod
POlfery, X-ray diffraClioll, Thermal analysis,
ArcJllleology, Conservation
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