Patent ID: 6849291

Claim:
A method of manufacturing a gas sensing element comprising a solid electrolytic body, a reference gas side electrode provided on a surface of said solid electrolytic body so as to be exposed to a reference gas, and a measured gas side electrode provided on another surface of said solid electrolytic body so as to be exposed to a measured gas, said manufacturing method comprising: providing a fine-grain nucleus of noble metal on an electrode forming portion of said solid electrolytic body; applying a reducing heat treatment to said fine-grain nucleus; forming an unbaked film electrode on said fine-grain nucleus; and baking said film electrode in a reducing atmosphere to form said measured gas side electrode thereby providing a crystal face strength ratio of said measured gas side electrode according to X-ray diffraction satisfies the following relationship 0.7 ≦{I (200)/ I (111)} or 0.61 ≦{I (220)/ I (111)} where I(200) represents the intensity of an X-ray diffraction measurement for a crystal face (200) of said measured gas side electrode, I(111) represents the intensity of an X-ray diffraction measurement for a crystal face (111) of said measured gas side electrode and I(220) represents the intensity of an X-ray diffraction measurement for a crystal face ( 220 ) of said measured gas side electrode.