Fepo4, The Iron Phosphate Fepo4 And Its Structural Differences

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The main structure mentioned in the article will be FePO4. The article analyses and discusses on a quartz-type compound, the Iron phosphate FePO4 and its structural evolution. In this assignment, the quartz will be referred to as SiO2. Under an experiment conducted, the temperature was ranged within 294K to 1073K. At high temperature, the structural parameter of FePO4 would converges to a β-quartz whereas it will converges to a α-quartz at lower temperature. As for the phase transition state, it will be situated at a temperature of 980K. During the α phase, the thermal expansion is effectively non-linear and this is supported by the change of tilt angles (tetrahedral) as well as the two symmetrically-independent bridging. Contrary
The α phase has a tetrahedral arrangement while the β phase has an octahedral arrangement. On comparison with other α- quartz, the α phase has traits that display angular variations so much larger than other kind of materials as they do not alter the structure initially. It is conclusive that a α-quartz is relatable to a α berlinite isotope from its electrical and thermodynamic traits to the degree of alteration of the β -quartz. The β -quartz would normally have a tetrahedral tilt angle of sigma when it comes to the degree of alteration. The transition between α and β would never occur during situation whereby the tetrahedral angles exceeds 22 degrees. The transition will not be suitable to take place as the temperature range will then be deemed as unsuitable. A higher temperature will have a higher pressure and this will lead to a strain in volume size as explained by the science model, the volume and pressure relationship. Using the tetrahedral tilt angles, the transition will be able to occur based on the mean tilt angles of FePO4 and PO4 tetrahedral structure.
In addition, FePO4 will exhibits a α FePO4 structure at any temperature lower than 980K while it will exhibit a β FePO4 structure at any temperature above 980K. Referring to figure 2, it shows the volume and unit cell constraints of FePO4 against different temperatures. From the figure, a direct proportionate trend is observed between the cell volume and temperature. When the temperature increases, the cell volume will increases as well. This would also imply that if the temperature decreases, the cell volume will decreases as well. The cell parameters ratio would however decrease for any temperature above 980K. Referring to table 6,the cell structure will display a trigonal structure for temperature that are below 980K. While on the other hand, it will display a hexagonal structure for temperature above 980K. Referring to figure 9 of the article, the tilt angles will decrease with the increasing temperature of α FePO4 quartz and this shows an inverse relationship between the two variables. Apart from this, the volume and cell constraints of α phase will increase slowly. Moreover, the ratio between A and C has shown a decrement greater than other α -quartz isotypes because of its typical angular differences in the quartz-type FePO4. The α β phase transition state is very similar to that of β -cristobalite as the Si-O bond distance are about the same as the Fe-O distance. From the article, it