| http://www.w3.org/ns/prov#value | - At first, the raw materials which were such as oxides, carbonates, hydroxides, nitrates, or the like were weighed and mixed to have the compositions in Tables 1 and 2, respectively, charged in a platinum crucible, melted with stirring at the temperatures of about 1400-1550??? C. for 6-8 hours, using a general apparatus for melting.
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