| Application of Thermochemistry and X-ray Semi-Quantitative
Phase Analysis in Forsterite Powder Synthesis by Solid
State Reaction of Magnesium Oxide and Mg-Chlorite |
Amir Javad Nikkhah, Esmaeil Salahi* and Mansour Razavi
Pages : 189-195
DOI : 10.1080/0371750X.2017.1327372 |
| Abstract |
| In this paper, high purity forsterite powder with anorthite grain boundary has been
synthesized by solid state reaction of industrial grade magnesium oxide and
Mg-chlorite at 1100oC. ASTM C547 and X-ray powder diffraction (XRD) were used for
chemical and phase analysis of raw materials. For microstructural analysis of prepared
specimens, XRD and back scatter scanning electron microscopy (BS-SEM) were used.
BS-SEM and elements mapping show the distribution of Mg, Si and O elements in
grains, and point analysis of these elements shows the portion of atomic percent as
forsterite. The detected elements in grain boundary are Si, Al, Ca and O; and based
on XRD pattern of the specimens, the anorthite phase is detected. MAUD software
was used for semi-quantitative analysis of phases based on Rietveld method in TC
specimen, the amounts of detected phases are 15.6 wt% free periclase and 84.4 wt%
forsterite that are very close to calculated amounts for 12.89 wt% free periclase and
87.11 wt% forsterite. The amount of forming phases strongly depends on well mixing,
soaking time and temperature, and reactivity of raw materials.
[Keywords: X-ray powder diffraction, Semi-quantitative phase analysis, Solid state
reaction, Back scatter scanning electron microscopy, Rietveld method] |
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