| http://www.w3.org/ns/prov#value | - These powder may be prepared according to various kinds of methods, for example, evaporation-condensation process, sputtering process, vapour deposition technique such as thermal decomposition or photolysis of metal halides or organometallic compounds, precipitation reaction in an aqueous solution, electrolytic process, hydronic discharge technique, spray drying method as well as mechanical pulver
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