Crystal Chemical Relationship Between Quartz (Sio2) And Feso4 Case Study
Paragraph 1: Crystal chemical relationship between quartz (SiO2) and FePO4
The following describes the crystal chemical relationship between quartz (SiO2) and FePO4.
At temperatures below 980 K, FePO4 exists as alpha- FePO4. Beyond the temperature mark of 980 K (at 980 K or higher), FePO4 exists as beta- FePO4. The geometrical symmetry of single cell of α- FePO4 is trigonal while the geometrical symmetry of β- FePO4 is octahedral structure.
At the alpha phase, the cell parameters shoots up by a large number and there is thermal expansion involved in this case because the bridging angles between the individual elements, such as Fe, O and P, increases as well. As the tilt angles are somewhat related to the bridging angles, the bridging angles increases as well. This overall leads to an increase in disorder for the FePO4 crystal. This disorder is made together with a decrease in time-averaged distances between the Fe and O elements. By total neutron scattering measurements, instantaneous distance for quartz SiO2 is expected to increase. This depicts the chemical relationship between quartz (SiO2 and FePO4). Also, in comparison with other compounds of alpha- quartz, the alpha phase of FePO4 has a larger vibration about the …show more content…
This is also known as the alpha-beta transition (α-β phase transition). Tetrahedral distortion results from a tetrahedral tilt, which can be determined by tilt angle (δ). This tilt angle depends heavily on the temperature at which the compound is subjected to. Together with the inter- tetrahedral bridging angle, the tetrahedral tilt angle altogether make up tetrahedral distortion. The length of the bond between the elements of the FePO4 will change when temperature increases. The angle between the Oxygen (O) and PO elements may also increase. The increase in bond length and bond angle overall add on the tetrahedral
The following describes the crystal chemical relationship between quartz (SiO2) and FePO4.
At temperatures below 980 K, FePO4 exists as alpha- FePO4. Beyond the temperature mark of 980 K (at 980 K or higher), FePO4 exists as beta- FePO4. The geometrical symmetry of single cell of α- FePO4 is trigonal while the geometrical symmetry of β- FePO4 is octahedral structure.
At the alpha phase, the cell parameters shoots up by a large number and there is thermal expansion involved in this case because the bridging angles between the individual elements, such as Fe, O and P, increases as well. As the tilt angles are somewhat related to the bridging angles, the bridging angles increases as well. This overall leads to an increase in disorder for the FePO4 crystal. This disorder is made together with a decrease in time-averaged distances between the Fe and O elements. By total neutron scattering measurements, instantaneous distance for quartz SiO2 is expected to increase. This depicts the chemical relationship between quartz (SiO2 and FePO4). Also, in comparison with other compounds of alpha- quartz, the alpha phase of FePO4 has a larger vibration about the …show more content…
This is also known as the alpha-beta transition (α-β phase transition). Tetrahedral distortion results from a tetrahedral tilt, which can be determined by tilt angle (δ). This tilt angle depends heavily on the temperature at which the compound is subjected to. Together with the inter- tetrahedral bridging angle, the tetrahedral tilt angle altogether make up tetrahedral distortion. The length of the bond between the elements of the FePO4 will change when temperature increases. The angle between the Oxygen (O) and PO elements may also increase. The increase in bond length and bond angle overall add on the tetrahedral