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The crystal chemical relationship between quartz (SiO2) and FePO4 can be studied by putting them under a temperature range of 294K to 1073K in an attempt to study the evolution of their structures. In doing so, we would able to examine the other quartz homeotypes that emerge during high temperatures and known to show a-b transitions. This study of quartz homeotypes were essential because the new information that was gathered would aid greatly in the creation of new products and more importantly, help to chart and record the behavior of SiO2. Hence, this would give us a more accurate representation of the crystal chemical relationship beween SiO2 and FePO4. Though the use of neutron powder diffraction, it was observed that FePO4 …show more content…
This is because the α- β transition for FePO4 occurs at 980K. In temperatures between 294K to 980K, the α- β transition for FePO4 does not occur and α-FePO4 maintains a trigonal unit cell. It is only at 980K that the structure of α-FePO4 changes into that of β-FePO4. While α-FePO4 has a trigonal unit cell, β-FePO4 has a hexagonal unit cell in temperatures above 980K. However, both α-FePO4 and β-FePO4 have only one single formula unit in its unit cell.
Figure 1.
Figure 1 clarifies the relationship between cell paramteres and cell volume of quartz-type FePO4 in temperatures above 294K. It can be observed that increases in temperatures can cause both cell parameters and volume to increase as well. Hence, there is direct correlation. The increase in cell volume would affect the bond angles between Fe-O-P.
Figure …show more content…
Using the neutron powder diffraction technique to study the quartz-type FePO4 in the temperature range of 294K to 1073K, it can be observed that the increase in the temperatures would simultaneously lead to an increase in energy, which would increase the dynamic disorder within the tetrahedral structure, before finally leading to the total increased dynamic disorder measurement of the unit cell. However, there are some assumptions to be made in order for this observation to be realised. It should assumed that the tetrahedral structure is rigid without any changes in its bond length. This way, we can attribute the main reason for any changes in the dynamic disorder measurement to changes in bond angles as well as tetrahedral tilt angles. This would also show that changes are extremely dependent on the relative
The crystal chemical relationship between quartz (SiO2) and FePO4 can be studied by putting them under a temperature range of 294K to 1073K in an attempt to study the evolution of their structures. In doing so, we would able to examine the other quartz homeotypes that emerge during high temperatures and known to show a-b transitions. This study of quartz homeotypes were essential because the new information that was gathered would aid greatly in the creation of new products and more importantly, help to chart and record the behavior of SiO2. Hence, this would give us a more accurate representation of the crystal chemical relationship beween SiO2 and FePO4. Though the use of neutron powder diffraction, it was observed that FePO4 …show more content…
This is because the α- β transition for FePO4 occurs at 980K. In temperatures between 294K to 980K, the α- β transition for FePO4 does not occur and α-FePO4 maintains a trigonal unit cell. It is only at 980K that the structure of α-FePO4 changes into that of β-FePO4. While α-FePO4 has a trigonal unit cell, β-FePO4 has a hexagonal unit cell in temperatures above 980K. However, both α-FePO4 and β-FePO4 have only one single formula unit in its unit cell.
Figure 1.
Figure 1 clarifies the relationship between cell paramteres and cell volume of quartz-type FePO4 in temperatures above 294K. It can be observed that increases in temperatures can cause both cell parameters and volume to increase as well. Hence, there is direct correlation. The increase in cell volume would affect the bond angles between Fe-O-P.
Figure …show more content…
Using the neutron powder diffraction technique to study the quartz-type FePO4 in the temperature range of 294K to 1073K, it can be observed that the increase in the temperatures would simultaneously lead to an increase in energy, which would increase the dynamic disorder within the tetrahedral structure, before finally leading to the total increased dynamic disorder measurement of the unit cell. However, there are some assumptions to be made in order for this observation to be realised. It should assumed that the tetrahedral structure is rigid without any changes in its bond length. This way, we can attribute the main reason for any changes in the dynamic disorder measurement to changes in bond angles as well as tetrahedral tilt angles. This would also show that changes are extremely dependent on the relative