One of the difficulties with ceramics in a chemistry lab is that making them involves very high temperatures.
If you have a good relationship with the art/technology department then please try to do some cross-curricular work making real ceramics in a kiln.
If that is not an option – or even if it is – here is a suite a small experiments that explore the nature and properties of some ceramics.
Ceramics – Experiment Guide
Ceramics – Teacher’s Guide
Ceramics – Technician’s Guide
Ceramics – Risk Assessment
Ceramics – introductory powerpoint
Making glass – pupil guide
Making glass – teacher’s guide
Making glass – risk assessment