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Nt1310 Unit 3 Lab Report

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The structural evolution of the FePO4 from the range of temperatures between 294K and 1073K as discussed in the study of quartz-type FePO4. It is different from other isotypes because it has an A-cation which is a transition metal. The structure of the α-quartz is formed at low temperatures, and it looks tetrahedral as shown in the figure 1 below. This tetrahedral structure represents the FePO4 at 294K.
Figure 1
The structure changes into something more dense and octahedral as the temperature increases towards
1073K, and this is known as the β-phase. FePO4 exhibits the first order transition at 980K. In this case, during the first order transition, we would observe that its structural parameters would go through important discontinuities. …show more content…
We can use the formula below to describe the temperature dependence of this angle. This type of model is called the Landau-type model. δ0 represents the decline in the tilt angle at 980K (which is the transition temperature) whereas Tc represents the temperature for the second-order transition. The average of the overall δ can also be used as the individual δ. During the α-β transition phase, the cell parameters and fractional atomic coordinates in the α-phase incline towards the values found in the β-phase and display intermittent changes at 980K.
The bond distances and angles have substantial fluctuations, and the thermal stability of the bridging angles and tilt angles of FePO4 are less than any α-quartz structure.
There are significant changes in bond distances and angles. Particularly it has been shown that the α-β transition in quartz can be modeled using a single order parameter, the tilt angle δ. The overall average tilt angle δ is used for FePO4 as both the individual average tilt angles of the FeO4 and PO4 tetrahedra depend on the fractional atomic coordinates of O1 and O2 and are thus correlated. The thermal

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