About: http://webisa.webdatacommons.org/347215457

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	Although other refractory metals could also be considered, some of these materials, such as Ti and Ta, form volatile metal hydrides at high temperatures in a hydrogen ambient, and are preferentially etched.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es