Patent ID: 6664117
Filing Date: 2003-12-16
Classification: G11C,H01L,Y10S

Abstract:
A method of forming a perovskite precursor solution comprising:selecting a R-RAM metal oxide having the general formula: Mâ€²xMâ€³(1âˆ’x)MyOz, wherein: Mâ€² is taken from the group of elements consisting of La, Ce, Pr, Nd, Pm, Sm Y, Sc, Yb, Lu, Gd; Mâ€³ is taken from the group of elements consisting of Mg, Ca, Sr, Ba, Pb, Zn, Cd; M is taken from the group of elements consisting of Mn, Ce, V, Fe, Co, Nb, Ta, Cr, Mo, W, Zr, Hf, Ni; x has a range of between 0 to 1; y has a range of between 0 to 2; and z has a range of between 1 to 7; and selecting a metal acetate from a group of metal acetates having the genera formula of: Mo(CH3CO2)u, where: Mo is taken from the group of elements consisting of La, Ce, Pr, Nd, Pm, Sm Y, Sc, Yb, Lu, Gd, Mg, Ca, Sr, Ba, Pb, Zn, Cd, Mn, Ce, Fe, Co, Cr, Mo, Zr, Hf and Ni; and u has a range of between 2 to 4; and Mo(CH3CO2)v.xH2O, where: Mo is taken from the group of element consisting of La, Ce, Pr, Nd, Pm, Sm Y, Sc, Yb, Lu, Gd, Mg, Ca, Sr, Ba, Pb, Zn, Cd, Mn, Ce, Fe, Co, Cr, Mo, Zr, Hf and Ni; and v has a range of between 2 to 4; and x has a range of between 1 to 4; mixing solid precursor material into acetic acid forming a mixed solution; refluxing the mixed solution in air for between about one hour to six hours; and filtering the refluxed solution when cooled.