## Abstract

This paper reports a systematic study of tungsten bronze morphotropic phase boundary (MPB) system Pb_{2-2X-3Y/2}Ba_{2x}RE_{y}K _{1-x}Na_{x}Nb_{5}O_{15}, where, x = 0.20, 0.25, 0.30, RE = Pr and Bi and y = 0.05 and their structure, microstructure, hysteresis, dielectric, piezoelectric, and Pyroelectric properties. Enhanced piezoelectric constants k_{p}, k_{t}, k_{31}, d _{31}, d_{33}, g_{31}, g_{33}, S _{11}^{E} as 30.8%, 47.6%, 18.9%, 57 × 10^{-12} C/N, 159 × 10^{-12} C/N, 6.89 × 10^{-3} mV/N, 19.23 × 10^{-3} mV/N, and 13.88 × 10^{-12} m^{2}/N respectively are observed in the composition for which y = 0, and x = 0.30, which is above MPB. Also, a change in thickness, 0.0159 μm has been developed for a thickness of the sample 1.2 mm, d_{33} = 159 × 10 ^{-12} C/N and for an applied voltage of 100 V. The same material produces a length extension, 0.0475 μm for d_{31} = 57 × 10^{-12} C/N, l = 10 mm, t = 1.2 mm, for an applied voltage of 100 V. Thus the material may be useful for a piezoelectric transducer. Enhanced piezoelectric coefficients, d_{31} = 96 × 10^{-12} C/N and g_{33} = 12.95 × 10^{-3} mV/N are also observed in the composition for which RE = Pr and x = 0.25.

Original language | English |
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Pages (from-to) | 1961-1976 |

Number of pages | 16 |

Journal | International Journal of Modern Physics B |

Volume | 22 |

Issue number | 12 |

DOIs | |

State | Published - 10 May 2008 |

## Keywords

- Dielectric
- MPB
- Piezoelectric
- Pyroelectric coefficient
- TB ferroelectrics