How to Interpret Solid-Liquid Phase Diagrams for Mixed Metal Oxide Systems?

[chickenoodle]

Homework Statement

Just sketch the solid-liquid phase diagram from the data.

the following data was collected from a cooling curve of the mixed metal oxide system XO-ZO, where X and Z are metals.

Homework Equations

http://img504.imageshack.us/img504/6415/chemdataur9.jpg

The Attempt at a Solution

I don't understand why the temperatures are called "halt" and "break" but I came up with this diagram. My professor and the textbook don't explain how to make these diagrams so I'm totally lost. Can someone check this and if its wrong help me correct it?
http://img519.imageshack.us/img519/3347/pchempd1go3.jpg

 

[GCT]

Halt may mean that it undergoes a phase change. Assuming that your graph is supposed to be the break temperature versus the composition your plot does not seem correct.

 

[Blueshift5]

I would like to provide a response to this content by first explaining the concept of a solid-liquid phase diagram. A phase diagram is a graphical representation of the phases of a substance at different temperatures and pressures. In a solid-liquid phase diagram, the solid and liquid phases of a substance are represented by different regions on the graph.

Looking at the data provided, it appears that the temperatures labeled as "halt" and "break" are the points where the substance changes from one phase to another. In this case, "halt" likely refers to the point where the substance starts to solidify and "break" refers to the point where it fully solidifies.

Based on the data, it appears that the substance undergoes a eutectic reaction, where two different substances (in this case, XO and ZO) form a mixture with a lower melting point than either pure substance. This is why the solid-liquid phase diagram for this system shows a eutectic point at approximately 500°C.

Your attempt at a solution is a good start, but there are a few corrections that can be made. Firstly, the axes of the graph should be labeled with the temperature and composition of the substance. The composition can be represented as a percentage of XO and ZO in the mixture. Additionally, the solid and liquid regions should not overlap, as they represent distinct phases of the substance.

A more accurate solid-liquid phase diagram for this system would look something like this:



This diagram shows the solid and liquid regions as separate and non-overlapping, with the eutectic point labeled at 500°C. The composition of the substance is also shown on the x-axis, with the pure XO and ZO compositions labeled at 0% and 100%, respectively.

In conclusion, a solid-liquid phase diagram is a useful tool for understanding the behavior of substances at different temperatures and pressures. By interpreting the data and creating an accurate diagram, we can gain a better understanding of the phase changes that occur within a substance.