| 摘要 |
PURPOSE:To improve the sensitivity by specifying the density of a ceramic prepared by sintering a metal oxide and exhibiting a pyroelectric effect. CONSTITUTION:A pyroelectric material composed of a ceramic prepared by sintering a metal oxide such as lead titanate (PbTiO3), lead titanate zirconate (PbZrTiO3) or lead germanate (Pb5Ge3O11) and exhibiting a pyroelectric effect and a large porosity shown by the density of the sintered material that is 60 to 93% of the true density. By making this pyroelectric material porous, adsorption of water, etc., in the air to the surface or into the inside of the pyrolectric device is increased and the characteristics of the device are worsen through reduction of the insulation resistance. For preventing this, the pyroelectric material is partly or wholly impregnated with an organic or inorganic insulating material so as to increase the strength and to prevent deposition of water, etc. |
