Influence of Pr 2 O 3 and Nd 2 O 3 on Ferroelectric and Pyroelectric Properties of Tungsten Bronze Structured BSNN Ceramics

Present communication describes the preparation and the influence of Pr 2 O 3 and Nd 2 O 3 on structure, ferroelectric, dielectric, pyroelectric and resistivity properties of (Ba 1-x Sr x ) 2 NaNb 5 O 15 [BSNN] compositions at and around x = 0.6, MPB region. Substitution of Pr 2 O 3 /Nd 2 O 3 decrease the cell volume and Curie temperature and enhance the room temperature dielectric constant. The room temperature pyroelectric coefficients are observed to be in the order of 10-9 C/cm 2 °C. Higher figure of merit FM RV , FM RN and FM RI values of the order 10-14 CM/J, 10-12 CM/J and 10-11 CM/J respectively are observed in both Pr/Nd:BSNN compositions. Resistivity studies revealed a PTCR behavior.