Patent ID: 8268408
Filing Date: 2012-09-18
Classification: C23C

Abstract:
1. A method of manufacturing a composite structure, said method comprising the steps of: (a) dispersing raw material powder formed of PZT (lead zirconate titanate) with a gas, thereby aerosolizing the raw material powder; (b) heating the raw material powder to a temperature not lower than 800° C. but lower than a melting point thereof to generate carbon dioxide gas so as to reduce an amount of carbon or compound containing carbon as impurity adhering to or contained in the raw material powder such that an amount of carbon within the raw material powder is not larger than 93 ppm in weight; (c) spraying the aerosolized raw material powder toward a substrate to cause the raw material powder to collide with an under layer, thereby binding particles having active surfaces newly-formed by deformation and/or crushing of the raw material powder at a time of collision to deposit the raw material powder and form a polycrystalline structure directly or indirectly on said substrate; and (d) annealing the polycrystalline structure formed on said substrate at step (c) at a temperature of at least 1000° C. for at least three hours so as to obtain a PZT film having an averaged crystal particle diameter larger than 400 nm and a light transmission factor of at least 20% with respect to light having a wavelength within a range from 500 nm to 900 nm when said PZT film has a thickness of 300 μm.