Verwendung eines ferroelektrischen keramischen Werkstoffs für die Informationsspeicherung bei elektrostatischen Druckverfahren

摘要

A ferroelectric ceramic material, for the storage of information in electrostatic printing processes, which ferroelectric ceramic material has a coercive force of less than 200 V/mm. The ferroelectric ceramic material consists of a ceramic perovskitic mixed crystal, which contains one or more components from each of Groups 1 and 2, whereby Group 1 contains the components PbTiO3, BaTiO3, Pb(Fe+E,fra 1/2+EE Nb+E,fra 1/2+EE )O3 and Pb(Zn+E,fra 1/3+EE Nb+E,fra 2/3+EE )O3 and Group 2 contains the components Pb(Mg+E,fra 1/3+EE Nb+E,fra 2/3+EE )O3, Pb(Ni+E,fra 1/3+EE Nb+E,fra 2/3+EE )O3, Pb(Fe+E,fra 2/3+EE W+E,fra 1/3+EE )O3 and Pb(Mn+E,fra 1/2+EE Nb+E,fra 1/2+EE )O3. The proportions of the components from the two groups in the mixed crystal are determined according to the following equation: where Xi is the mole fraction of the i-component, Tci is the Curie point of the i-component and TcM is the Curie point of the mixture between 50 DEG C. and 100 DEG C.