| 摘要 |
PURPOSE:To obtain a garnet fine particle powder having excellent corrosion resistance, magnetic optical effect and light transmittance by forming precipitates with an alkali hydroxide from a solution containing respective element ions in a ratio required for a specific rare earth-iron garnet and subsequently calcining the precipitates. CONSTITUTION:A solution containing respective element ions selected in a constituting rate required for a rare earth-iron garnet represented by the genera formula: RaBibFecMdOe [R is one or more rare earth elements selected from Y and lanthanoid elements; M is Al, Ga, Cr, Mn, Sc, In, Ru, Rh, Co, Fe(II), Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb; a+b+c+d=7.5-8.0; a+b=2.0-3.5; c+d=4.5-6.0; a=0.5-3.5; b=0-2; c=3.0-6.0; d=0-2.0; e is a number of oxygen atoms satisfied with the atomic valences of other elements] is mixed with an alkali hydroxide in a concentration of 0.1-8 moles/l to form precipitates, which are calcined at 600-900 deg.C to provide garnet fine particle powder having an average particle diameter of 30-1000Angstrom . |
