Patent ID: 7727322

Claim:
A method for manufacturing a precursor solution comprising: forming a first solution by dissolving lead carboxylate in an organic solvent having an alkoxy group to form a lead alkoxide; after forming the first solution, forming a second solution including the lead alkoxide by heating the first solution at a temperature ranging between 110° C. and 180° C.; after forming the second solution, forming a third solution by adding a zirconium alkoxide, a titanium alkoxide, and a niobium alkoxide to the second solution, the third solution thereby including the lead alkoxide, the zirconium alkoxide, the titanium alkoxide, and the niobium alkoxide; and after forming the third solution, forming a fourth solution provided by adding water to the third solution, wherein an amount of the niobium alkoxide is 0.05-0.3 mol with respect to a total of 1 mol of the zirconium, titanium, and niobium alkoxides.