## Abstract

To minimize pyroelectric effects while keeping high piezoelectric effects in relaxor-PbTiO_{3} single crystals, the crystallographic orientation dependence of the pyroelectric and piezoelectric coefficients were investigated for binary (1 - x)Pb(Mg_{1/3}Nb_{2/3})O_{3}-xPbTiO _{3} (PMN-PT), ternary (1 - x - y)Pb(In_{1/2}Nb _{1/2})O_{3}-yPb(Mg_{1/3}Nb_{2/3})O _{3}-xPbTiO_{3} (PIN-PMN-PT) and Mn-doped PIN-PMN-PT single crystals with the "4R" multidomain state. The secondary pyroelectric coefficients were calculated from the thermodynamic inter-relationship between the piezoelectric, elastic, and thermal expansion coefficients, being on the order of (1.16-1.23) × 10^{-4} C m^{-2} K^{-1} for binary crystals and (0.97-2.03) × 10^{-4} C m^{-2} K ^{-1} for ternary ones. The primary pyroelectric coefficients were -(6.73-6.84) × 10^{-4} C m^{-2} K^{-1} and -(5.44-6.43) × 10^{-4} C m^{-2} K^{-1} for binary and ternary crystals, respectively. The pyroelectric coefficients could be reduced by matrix rotation, but at the cost of decreasing longitudinal piezoelectric coefficients d_{33}. Of particular interest is that the maximum piezoelectric coefficients d24â̂ - at θ = ±55^{o} and d34â̂ - at θ = ±35 ^{o} by a counterclockwise rotation of θ about the X axis (θ is the rotation angle about the coordinate axes), or d15â̂ - at θ = ±55^{o}, and d35â̂ - at θ = ±35^{o} by a counterclockwise rotation the Y axis, were found on the order of 3000 pC N^{-1}. The corresponding pyroelectric coefficients could be reduced by ∼20%. The reduced pyroelectric coefficients that can contribute to decrease undesirable output signals, together with the high piezoelectric coefficients, enable relaxor-PT crystals as favorable candidates for high-sensitivity piezoelectric sensors.

Original language | English (US) |
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Pages (from-to) | 135-140 |

Number of pages | 6 |

Journal | Materials Chemistry and Physics |

Volume | 145 |

Issue number | 1-2 |

DOIs | |

State | Published - May 15 2014 |

## All Science Journal Classification (ASJC) codes

- General Materials Science
- Condensed Matter Physics

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