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EFFECT OF YTTRIUM ON DIELECTRIC, PYROELECTRIC AND PIEZOELECTRIC PROPERTIES OF PBN FERROELECTRICS

K. SAMBASIVA RAO

Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, Visakhapatnam-530 003, India

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N. VALLIS NATH

Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, Visakhapatnam-530 003, India

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P. MURALI KRISHNA

Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, Visakhapatnam-530 003, India

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D. MADHAVA PRASAD

Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, Visakhapatnam-530 003, India

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, and

JOON HYUNG LEE

Department of Inorganic Materials Engineering, Kyungpook National University, Daegu, 702701, Korea

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https://doi.org/10.1142/S0217979206035345Cited by:2 (Source: Crossref)

Abstract

Materials with batch formula Pb_(1-x-3y/2)R_yBa_xNb₂O₆, where R=Y, (1-x)=0.73, 0.63, 0.53 and y=0.00, 0.02 have been prepared by the double sintering method. Substitution of yttrium (Y) restored tetragonal symmetry of PBN but reduced lattice parameters, cell volume and enhanced the density. Transition temperature of PBN has decreased due to the substitution of Y³⁺. Enhanced room temperature spontaneous polarization (P_s)=149.97 μC/sq. cm has been observed in PBN53, which is above MPB, whereas enhanced value of P_s=112.74 μC/sq. cm is found in Y: PBN63 at MPB region. The room temperature Pyroelectric coefficient (P_RT=1.07) has been observed in the composition where maximum volume of P_s is obtained. Similarly, enhanced values of piezoelectric coefficients K_p=0.244, K_t=0.353, K₃₁=0.131, d₃₁=60, d₃₃=159 and g₃₁=3.65 have also been found in the same material PBN53. Substitution of Yttrium enhanced the stiffness constant 13.59 in PBN 73 to 14.27 of Y: PBN73.

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