Mercury(II) iodide is heated to convert it from its red low-temperature alpha form to its yellow high-temperature beta form.
When red-orange mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126°C to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
Credits:
- Design and Demonstration
- George Gilbert Denison University, Granville, OH 43023
- Video
- Jerrold J. Jacobsen University of Wisconsin - Madison, Madison, WI 53706
- Text
- George Gilbert Denison University, Granville, OH 43023
- Kelly Houston Jetzer University of Wisconsin - Madison, Madison, WI 53706
- David Phillips Wabash College, Crawfordsville, IN 47933
- Nancy S. Gettys University of Wisconsin - Madison, Madison, WI 53706