Variation of pyroelectric and dielectric properties in Sr0.3-3y/2LayBa0.7Nb2O6 ceramics by impurification with various concentrations of La

The cationic substitution of 1, 3, y 5% of La3+ in the A sites of the perov skite structure of the Sr0.3-3y/2LayNb2O6 ceramics significantly modifies i ts dielectric and pyroelectric properties. Experimental measurements of die lectric permittivity as a function of temperature and pyroelectricity as de termined by the static method are presented. An improvement in the pyroelec tric behavior, in the maximum dielectric permittivity are observed for the compositions with doping up to 3% of La3+. For doping of 5% and above, the above mentioned properties tend to deteriorate apparently due to a solubili ty limit of the La3+ in the ceramic host.