| abstract |
[PROBLEMS] To produce ultrafine particles having a diameter of 10 nm or less at low cost, which are expected to have unique physical properties and high performance of functional materials. For example, conventional ferromagnetic fine particles for magnetic recording have a diameter of 1 mm. It was 0 nm or more, and it was impossible to achieve ultra-high density at the TB (terabyte) level for magnetic recording. Constitution: y mol of MX P ยท nH 2 O (M: transition metal or rare earth metal, X; halogen element selected from F, Cl, Br, I, p = 2 or 3, n is 0 to 9) Aqueous solution) and y mole of Na 2 SiO 3 .mH 2 O (m = 9 or 0) is wet mixed at room temperature and left to form a precipitate, which is washed, dried and further converted to the oxide by calcination in air, Amorphous SiO 2 + M i O j oxide (i and j are 1 to (Integer of 9) to produce nanoparticles. |