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Amorphous complex colloid containing La3+ and Sn4+ ions with a stoichiometric ratio in a bulk solid particle was prepared by rapid hydrolysis of homogeneous aqueous solutions of tin (VI) and lanthanum chlorides under strongly basic conditions. Heating of the complex colloid at relatively low temperatures (>800°C) resulted in the direct formation of La2Sn2O7 active powder from the amorphous colloid particles without forming any intermediate phase. Some powder properties were measured for the amorphous and crystallized particles. Possible structural correlations between the amorphous colloid and the crystalline particles were discussed on the basis of the results obtained from infrared absorption spectroscopic examination on the structural change occurring during heat treatment of the amorphous particles. The simple procedure employed in the present work to prepare complex colloid consisting of La3+ and Sn4+ ions is applicable to powder formation of the family of Ln2B2O7 (Ln=lanthanide atoms, B=Sn or Ti).

yōgyō kyōkaishi/yougyou kyoukaishi

Synthesis of La&lt;sub&gt;2&lt;/sub&gt;Sn&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; Powder from Complex Colloid Prepared in Strongly Basic Solution