About: http://webisa.webdatacommons.org/417334522

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	One of the constituents may have a negative coefficient of thermal expansion and may include a carbon based material such as graphite or diamond.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com