Abstract: There are a piezoelectric ceramics-polymer composite material and a method for the preparation of the same which comprises10 to 60% by volume of silane-coated PZT piezoelectric ceramics powder based on the total volume of the composition;at most 3% by volume of carbon powder based on the total volume of the composition; andbalance volume of PVdF piezoelectric polymer.

Abstract: A method for preparing a perpendicularly magnetizable material usable on magnetic recording media comprises the steps of: dissolving at least one member of the group consisting of strontium chloride and strontium nitrate with at least one member of the group consisting of iron chloride and iron nitrate in distilled water; adding citric acid to the resultant solution; controlling the pH of the solution to a range sufficient to completely dissociate the citric acid; heating the resultant solution with stirring to yield a gelatinous precursor; and subjecting the precursor to a temperature sufficiently high to remove the organic constituents thereof, which is characterized by controlling the pH of the solution to gelate the solution without the use of ethylene glycol, and can provide a perpendicularly magnetizable material superior in magnetic and particle properties.