METHOD FOR PREPARATION OF NANODIMENSIONAL FERROELECTRIC POWDER Russian patent published in 2009 - IPC C01G23/00 C01G25/00 C01G33/00 C01G35/00 B82B1/00 H01L41/187 

FIELD: chemistry.

SUBSTANCE: invention refers to the preparation of the materials for ferroelectric ceramics used in electronics. The method includes the hydrolysis of rare metal compound with formation of rare metal precipitate which is then separated and suspended. The compound of the alkali or bivalent metal is fed into suspension at pH 5.5-13 and temperature 71-95°C. The suspension is vigorously mixed during 15 min or more at the value of Reynolds criterion (8-20)·10⁴. The ferroelectric powder is washed and dried at the temperature 40-95°C. The rare metal compounds are compounds of titanium, zirconium, tantalum or niobium in the form of fluorides, chlorides, sulphates or phosphates. The alkali metals compounds are used in the form of hydroxides, chlorides, nitrates or sulphates. The bivalent metals compounds are compounds of barium or strontium in the form of hydroxides, nitrate, chlorides, sulphates as well as lead nitrate.

EFFECT: providing of the particle size control of the nanodimensional powders of the titanates, zirconates, tantalates or niobates of mono- and bivalent metals and obtaining of stoichiometric powders with narrow grading and saving of monophasity

8 cl, 10 ex