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.