Ferroelectric KH2PO4 and antiferroelectric NH4H2PO4 nanocrystalline particle materials embedded in porous materials

摘要

The present invention relates to a method for producing nanocrystal-line particles of ferroelectrics and anti-ferroelectrics having a size of several nm to several tens of nm, in which the porous material having fine pores is used in the pores. It is a process of incorporating an aqueous solution of ferroelectric or antiferroelectric material to dry and crystallize. In this way, the nanocrystals of ferroelectric KH ₂ PO ₄ (KDP) and antiferroelectric NH ₄ H ₂ PO ₄ (ADP) can be converted into silica gel or Corning's Vycor glass. A material embedded in the porous material was made. Crystal properties were confirmed by X-ray irradiation, dielectric constant measurement and infrared reflectance measurement of these materials. They can be used as absorbers of electromagnetic waves such as microwaves and far infrared rays, and 3 nm sized KDP nanocrystal materials in Vycor glass manufactured as one have infrared absorption characteristics around 1093 cm ^-1 .