تقدير الصيغة الكيميائية لمعدن الفرانكولايت في فوسفورايت تكوين عكاشات من معطيات الأشعة السينية الحائدة
Other Title(s)
The chemical formula of francolite in the phosphorite of akashat formation from x-ray diffraction analysis
Joint Authors
الدباغ، سالم محمود
اليوزبكي، قتيبة توفيق
Source
المجلة العراقية الوطنية لعلوم الأرض
Issue
Vol. 18, Issue 2 (31 Dec. 2018), pp.61-88, 28 p.
Publisher
University of Mosul College of Science
Publication Date
2018-12-31
Country of Publication
Iraq
No. of Pages
28
Main Subjects
Earth Sciences, Water and Environment
Abstract EN
Francolite (one of apatite group) found in marine formation sedimentary rocks.
It is called carbonate-fluorapatite; owing to the substitution of CO3 for PO4 in its unit cell; Ca10(PO4CO3)6F2.
Francolite unit cell composed of 4 Ca occupy the sites on ternary axis which are represent the Ca(I) sites, 6 Ca occupy the sites on hexad axis which are represent the Ca(II) sites.
6 P are joined with 24 oxygen to form 6 phosphate tetrahedrons and 2 sites occupied by F in the intermediate channel of the francolite crystal.
There is no differences will noticed along the three a-axis due to the slight effect of the substitution in the 4 Ca(I), this is may be due to the homogenous effects along the three a-axis in these sites.
On the other hand, the substitution of planner carbonates for the tetrahedron phosphates cause decreasing in a-axis and slight increasing in the c-axis.
These changes are reflected on the x-ray diffraction patterns; the angular distance (Δ2θ distance) between the two faces 410 and 004 will decrease, shifting in some peak positions and increasing in the width of reflecting peaks.
The present study deals with the idea of the substitution of (CO32-+F-) for (PO43-) and suggests the Ca(I) sites are candidate to the substitution for large cations e.g.
Sr2+, Ba2+and K+ and the Ca(II) sites for smaller cations e.g.
Mg2+ و Na+.
Depending upon the x-ray parameters, there are many formulas were estimated for determined the carbonate (mole/formula) in francolite formula in terms of 2θ (002-310).
the carbonate (mole/formula) were determined by a – axis and c/a depend on the mole/formula of carbonate in fluor-apatite and carbonate-apatite.
In the present study there is no relation between additional F and a –axis, but two linear relation were found between additional F and c–axis in both groups (concentrated apatite and ores) samples and (production lines and slime) samples.
As well as, the estimation of the Na and Mg mole per formula in francolite.
American Psychological Association (APA)
اليوزبكي، قتيبة توفيق والدباغ، سالم محمود. 2018. تقدير الصيغة الكيميائية لمعدن الفرانكولايت في فوسفورايت تكوين عكاشات من معطيات الأشعة السينية الحائدة. المجلة العراقية الوطنية لعلوم الأرض،مج. 18، ع. 2، ص ص. 61-88.
https://search.emarefa.net/detail/BIM-902824
Modern Language Association (MLA)
اليوزبكي، قتيبة توفيق والدباغ، سالم محمود. تقدير الصيغة الكيميائية لمعدن الفرانكولايت في فوسفورايت تكوين عكاشات من معطيات الأشعة السينية الحائدة. المجلة العراقية الوطنية لعلوم الأرض مج. 18، ع. 2 (2018)، ص ص. 61-88.
https://search.emarefa.net/detail/BIM-902824
American Medical Association (AMA)
اليوزبكي، قتيبة توفيق والدباغ، سالم محمود. تقدير الصيغة الكيميائية لمعدن الفرانكولايت في فوسفورايت تكوين عكاشات من معطيات الأشعة السينية الحائدة. المجلة العراقية الوطنية لعلوم الأرض. 2018. مج. 18، ع. 2، ص ص. 61-88.
https://search.emarefa.net/detail/BIM-902824
Data Type
Journal Articles
Language
Arabic
Notes
يتضمن مراجع ببليوجرافية : ص. 86-88
Record ID
BIM-902824