| http://www.w3.org/ns/prov#value | - When a gas to be detected is oxygen, usable as this material is a solid electrolyte prepared from a solid solution of at least one CaO, Y2 O3, Gd2 O3, Sm2 O3, MgO, etc., in at least one of oxides such as CeO2, ZrO2, HfO2 ThO2, Bi2 O3, etc.
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