FERROELECTRIC CERAMIC, PYROELECTRIC AND PYROELECTRIC INFRARED RAY DETECTOR

摘要

PROBLEM TO BE SOLVED: To impart an excellent quality factor to a pyroelectric consisting of a solid solution of lead zirconate, lead titanate and magnesium lead niobate and a ceramic doped with manganese or the like. SOLUTION: A ferroelectric ceramic consisting of the solid solution of lead zirconate, lead titanate and magnesium lead niobate, doped with manganese or the like to control the electrical conductivity, having a composition expressed by a formula, Pb1+(((Mg1/3Nb2/3)y(Zr1-xTix)1-y)1-zAz)O3 and used as the pyroelectric is prepared. In the formula, each of , x, y and z is 0.05==0 and preferably 0.02=0, 0.4=x0 and preferably 0.25=x0, 0.4=y0 and preferably 0.24=y0, 0.05=z0 and 0.88=(1-x)(1-y), A represents a cationic polyvalent octagonal site substituting group, is manganese or uranium and substitutes Mg, Nb, Zr and Ti on the perovskite lattice site by oxygen ion forming octagonal coordination.