| http://www.w3.org/ns/prov#value | - In order to bring an interplanar spacing of (020) plane of the alumina hydrate in the recording medium into the above-specified range, the treating conditions such as heating temperature and heating time can be decided preliminarily for obtaining the recording medium having the interplanar spacing of (020) plane within a range mentioned above by varying the heating conditions of the alumina hydrat
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