The converse, negative thermal expansion ceramics like zirconium tungstate, are fascinating materials; they shrink when you heat them. It's all to do with low-

The converse, negative thermal expansion ceramics like zirconium tungstate, are fascinating materials; they shrink when you heat them. It's all to do with low-frequency vibrational modes, but if I started talking about mode Gruneisen parameters I'd start boring the arse off all of you and, what's worse, giving myself flashbacks...