Abstract
Lanthanum oxide (La 2O 3) was subjected to grinding with polytetrafluoroethylene (PTFE, (CF 2CF 2) n ) in air using a planetary mill followed by thermal treatment to synthesize lanthanum oxyfluoride ultra-fine particles. The grinding operation causes mechanochemical (MC) reaction between the two materials. The MC reaction is almost finished by 240 min, and the products ground for 240 min or more are composed of LaOF, amorphous La(CO 3)F and amorphous carbon (C). Heating this MC reaction product at 600 °C enables us to eliminate amorphous C and decompose La(CO 3)F into LaOF, so that pure LaOF material can be obtained as the final product. The average particle size of the final product (purified LaOF) is around 10 nm.
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