Paragraph 1
The quartz type Iron (III) Phosphate (FePO4) evolves with the changing temperature from 294K to
1073K. From this, the polymorphic transformations in iron phosphate as a function of temperature can be observed. From iron phosphate, all the iron and all of the phosphorus are in tetrahedral coordination to oxygen. All of the iron and the phosphate are in tetrahedral coordinates. It also has a very open structure and has a lot of empty spaces. This means that as the temperature changes by neutron powder diffraction, the structure of the molecules would either expand or compress – the higher the temperature, the more the FePO4 will expand and vice versa. Hence, when looking at it at the right direction, hexagonal tunnels can be seen. The hexagonal …show more content…
Kristallogr. 218, 193-200 (2003) Paper)
From the table above, it can be observed that during the α-β transition phase, as the temperature increases, the parameters, a and c, increases together with the volume. The following figures will show the change in the structure as the temperature increases. It can also be concluded
T=465K T=659K
T=759K T=865K
T = 938K T=969K
T = 1005K
Another observation is that there is no significant change on the length between the bonds of the cell and the angle with the increase in temperature. However, it decreases slightly after the 980K transition. It can also be concluded from the ATOMS diagrams that the inverse relation between the tilt angle and the temperature. As the temperature reaches the transition temperature, the tilt angle decreases firmly. One may notice that there is no apparent change in the first few stages. Only upon closure to the transition temperature of 980K, then the α- FePO4 structural parameters will change to the values of the β- FePO4. After the transition, there is no significant increase in thermal expansion. Paragraph 3
Factors contributing to the tetrahedral distortion includes inter-tetrahedral tilting, δ, and
The quartz type Iron (III) Phosphate (FePO4) evolves with the changing temperature from 294K to
1073K. From this, the polymorphic transformations in iron phosphate as a function of temperature can be observed. From iron phosphate, all the iron and all of the phosphorus are in tetrahedral coordination to oxygen. All of the iron and the phosphate are in tetrahedral coordinates. It also has a very open structure and has a lot of empty spaces. This means that as the temperature changes by neutron powder diffraction, the structure of the molecules would either expand or compress – the higher the temperature, the more the FePO4 will expand and vice versa. Hence, when looking at it at the right direction, hexagonal tunnels can be seen. The hexagonal …show more content…
Kristallogr. 218, 193-200 (2003) Paper)
From the table above, it can be observed that during the α-β transition phase, as the temperature increases, the parameters, a and c, increases together with the volume. The following figures will show the change in the structure as the temperature increases. It can also be concluded
T=465K T=659K
T=759K T=865K
T = 938K T=969K
T = 1005K
Another observation is that there is no significant change on the length between the bonds of the cell and the angle with the increase in temperature. However, it decreases slightly after the 980K transition. It can also be concluded from the ATOMS diagrams that the inverse relation between the tilt angle and the temperature. As the temperature reaches the transition temperature, the tilt angle decreases firmly. One may notice that there is no apparent change in the first few stages. Only upon closure to the transition temperature of 980K, then the α- FePO4 structural parameters will change to the values of the β- FePO4. After the transition, there is no significant increase in thermal expansion. Paragraph 3
Factors contributing to the tetrahedral distortion includes inter-tetrahedral tilting, δ, and