| http://www.w3.org/ns/prov#value | - When the activating material is a metal oxide, the metal oxide may comprises tungsten oxide, silica, zirconia, alumina, titania, tantala, zinc oxide, nickel oxide, magnesium oxide, calcium oxide, boron oxide, potassium oxide, sodium oxide, chromium oxide, tin oxide, lithium oxide, lead oxide, or phosphorous oxide.
|
