Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
Priliminary report on REEs in apatite from Esfordi
iroD~apatite ore deposit
73
84
FA
Y
N
The Esfordi iron - apatite ore in Central Iran is
locAted in Bafq metallogenic province. Stratigraphically
most of the rock units belong to Precambrian and Cambrian
sequenses which the sedimentary and volcanic series are the
most spreading rock types and mineralization took place just
within the vOlcanic-sedimentary unit of the mentioned
series. Study of REE contents of apatite in Esfordi
iron-apatite orc shows high concentration of thClie elements.
Zonal distribution of some REEs, e.g. La, is identified
which varies from center to the rim of apatite ~ingle crystal.
Absence of negative Eu anomaly makes the Esfordi apatite
distinctive from the igneous types and may indicate a
hydrothermal origin for Esfordi apatites.
•
Apatite, Rare Earth Elemellfs, Bafq, Esfordi
http://ijcm.ir/article-1-876-en.html
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
TEM study of (2223) BSCCO
superconducting material
85
96
FA
Y
The EDT A gel processing route has been used to
produce (2223) BSCCO superconductiong oxides. Gel -
processed (2223) BSCCO material was sintered in air or
oxygen to produce specimens for transition temperature
determination; the same specimens were characterised by
high re.'ioultion transmission electron microscopy fitted with
EDAX analysis to yield information about homogeneity,
microstructure and identification of any grain boundary
phases that may be present. Electrical resistivity
~"rew;:."", ~~"" btel ",le "1"'tI ~" .;tIerell ",.en.s
to allow the superconducting transition temperature to be
determined as a function of sintering atmosphere.
Transition to a superconducting state at I 10k was observed
in samples sintered and quenched in air
SupercOnduclillg malerial, electron diffraction, Sintering
atmo.~phere, homogeneity of composition
http://ijcm.ir/article-1-877-en.html
http://ijcm.ir/article-1-877-en.pdf
Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
Crystal Structure and Synthesis of Cis - Bis -
{(Endo - 3 - diphenylphosphino - (lR) (+) Camphor)}
Dichloro Iridium (I)
97
105
FA
Y
N
In [his research endo-3-diphenylphosphino -(IR)(+)
camphor as a ligand was synthesised. 1.3 mmol of
IrC12(NCPh)2 was added to the solution of 2.7 mmolligand
in 15 ml dicloromethane, and after one hour it was
evaporated at reduced pressure. By addition of methanol
microcrystals of yellow complex of lridium(I) with 78% yield
was obtained. Crystal structure of the above complex are
orthorhombic, space group P212121 with a = 380.3(2),
b = 1785.1(3), c = 19.228(4)A and z =4, R = 0.0453 for
4438 observed reflections. The structure shows that PPh2
groups are endo and phosphines in cis position.
Crystal Stntcture, Synthesis oj Iridium Complexes
http://ijcm.ir/article-1-878-en.html
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
Genesis of the Jalal Abad Iron Ore neposit
107
122
FA
Y
N
The Jalal Abad iron ore deposit is one of the seven
most important iron ore deposilS in the central Iran. with a
probable are reserve of 200.4 million tons of iron ore in which
the average grades are estimated as 44.28% Fe, 0.83% Sand
0.07%P. In the Jalal Abad deposit two types of orebodies are
identified: the orebodies which are concordant with respect to
the sedimentarY most rocks (Jalal Abad I). and the orebodies
which are discordant with respect to their carbonate host. rocks
(Jalal Abad II). In this deposit the primary ore minerals are
magnetile and hematite. Hematite is also formed from the
oxidation of magnetite. It is proposed that the deposit was
rormed in two stages as describled below.
1) The principal orebodies were 'formed contemporaneous with
the sedimentation. from the exbalites and precipitates associated
with volcanic activity within an intracontinental sources. This
pan of the deposit is named Jalal Abad l.
2) After formation of the Jalal Abad orebodies. due to
emplacement or the igneous rocks within the ore zone, the
meteoric and/or connate water contained in the Jalal Abad J:
then iron was redeposited from the upwelling iron bearing
solution as replace,m ent orebo<1ies within the carbonate rocks. 1n
this manner JalaJ Abad II orebodies were formed.
Ja/cll Abad, Iron ore deposit, geochemistry
http://ijcm.ir/article-1-879-en.html
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
Detailed Microstructure and Mineralogical
Investigation of Basic Refractories
123
138
FA
Y
Vein and hydrothermal . sedimeOI~ry types of magnesite
from eastern Iran probably originated from ascending
hydrothermal solutions. The cryptocryistalline magnesite is very
pure although it has a variable CaO/Si02 ratio. It is compact with
a very fine and uniform texture. The mineralogy of samples of
dead burned magnesites calcined at different temperatures and
times arc variable and can be predicted from phase equilibria
studies. The textural relationships studied using scanning electron
microscopy show that matrix is concentrated at peric1ase crystal
boundaries particularly at the triple points. The periclase crr-itals
are larger at increased calcination temperatures and times. The
amount of periclase - Periclase grain contact reduces by increasing
the amount of impurities.
Electron microprobe results confirm that CaO and FeO in
periclase increase steadily with the increase in the CaOlSi02 ratio
and FeO content of bulk chemistry respectively.
The mineral chemistry of forsterite. monticellite. merwinite,
dicalcium silicate and tricalcium silicate in dead burned magnesite
indicate some solid solution between some phases, although
sometimes it is difficult to analyse single phases. This study
indicates that high quality dead burned magnesia bricks can be
produced from the Iranian natural magnesite with low CaO , Si02
and FeO impurities and by maintaining the CaOlSi02 ratio of
around 2:1.
peric/ase (magnesia = MgO), [orsterite, mOflticellite,
mefWinile, dicalcium and tricalcium silicates.
http://ijcm.ir/article-1-880-en.html
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
6
2
1998
10
1
Investigation of the role of microstracture on magnetic
properties of Ni-Zn ferrites, prepared from modified
Mobarakeh steel Complex Iron Oxide
139
146
FA
Y
N
N
In th is work, permeabi lity variation of Ni and
Ni-Zn ferrites due to microstracture is slud id. The
conventional wet ceramic techniqe was used for the
preparation of the sampla. The samples were shaped in the
form of toroids and disks and were sintered in differant
tempraturees. using a LCR-meter, inductance of loroid'i was
macsured and tben pennaebility was calculated. To see the
relation between grain sise and permaebility. a series of
SEM photographs were obtained. The results of these
photographs shows that with increasing the si ntering
temperature the mean size of grans will increase. In the
o ther hand, the magnetic measu rement on toroid samples
show that with increasing the mean size of grain the
magnetic premeability increases, bUI Ihis procedure will nOI
continue and then it falls. The reason of this behavior is
describe based on displacing of grain boundaries so that the
porosities faU in the grains
SO/I ferri-Ies, sintenllg, microslralure, premellbiluy
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