NOVELTY - Forming a powder of complexometric precursor, involves providing two reactors, each having gas diffuser and agitator; charging the first reactor vessel with a first solution comprising salt of positive ions; introducing gas into the first solution through first gas diffuser; charging the second reactor vessel with a second solution comprising a salt of anion; adding the second solution and first solution to form a complexcelle; drying the complexcelle; and calcining the dried powder.    USE - For forming fine and ultrafine powder (micropowder) and nanopowders of e.g. lithium metal oxides (preferably lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, and lithium mixed oxides of cobalt, nickel and manganese), calcium phosphates, lithium aluminosilicates, lithium aluminates and lithium metal phosphates (all claimed) useful in applications e.g. rechargeable battery, solar cells, fuel cells and biofuels.    ADVANTAGE - The method provides powder having a particle size of less than 1 micron; and a surface area of more than 1 m2/g. The CPF method produces fine, ultrafine and nanosize powders; and reduces production cost as much as 75-80% of current conventional processing. There is no significant milling and firing sequence in the CPF method. The total production time for the CPF methodology route to fine, ultrafine and nanosize powders is less than or equal to 25% of current conventional processing technologies for such similar powders. The method provides performance improvements of at least greater than or equal to 15% than those traditional ceramic powders. The CPF method proceeds in the formation of complex precursor, on a bubble surface thereby providing for the controlled formation of specialized microstructures or nanostructures and a final product with particle size, surface area, porosity, phase purity, chemical purity and other essential characteristics. Powders produced by CPF are obtained with a reduced number of processing steps relative to currently used technology and can utilize presently available industrial equipment. The CPF procedure uses low cost raw materials as the starting raw materials; easily achieves inert or oxidative atmospheric conditions required for powder synthesis; and requires ambient temperature or slightly warm but preferably not greater than 100 degrees C.    DETAILED DESCRIPTION - A method (M1) of forming a powder of formula MjXp of complexometric precursor formulation (CPF), involves providing a first reactor vessel with a first gas diffuser and an first agitator; providing a second reactor vessel with a second gas diffuser and a second agitator; charging the first reactor vessel with a first solution comprising first salt of Mj; introducing gas into the first solution through first gas diffuser; charging the second reactor vessel with a second solution comprising a salt of Mp; adding the second solution and first solution to form a complexcelle; drying the complexcelle, to obtain a dry powder; and calcining the dried powder of MjXp.    Mj=at least one positive ion selected from alkali metal, alkaline earth metal or transition metal;    Xp=monoatomic or polyatomic anion selected from Groups IIIA, IVA, VA, VIA or VIIA.