An inorganic composition comprises an inorganic matrix, wherein an inorganic
layered
compound is contained in the inorganic matrix. The inorganic matrix is preferably
a metal oxide glass produced by a sol-gel method, and the inorganic layered compound
is preferably swelling synthetic mica. A method of producing a film includes the
steps of: hydrolyzing, dehydrating, and condensing an organic metal compound to
obtain a reaction product; adding and dispersing the inorganic layered compound
in the reaction product; coating the reaction product containing the inorganic
layered compound on a substrate surface; and heating the substrate surface coated
with the reaction product at a temperature of not more than 200 C. to vitrify
the reaction product.
