Primary and secondary pyroelectric coefficients of rhombohedral and tetragonal single-domain relaxor-PbTiO3 single crystals

Yanxue Tang, Shujun Zhang, Zongyang Shen, Wenhua Jiang, Jun Luo, Raffi Sahul, Thomas R. Shrout

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Abstract

The primary and secondary pyroelectric coefficients were determined for binary (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) and ternary Pb(In1/2Nb1/2)O3- Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PIN-PMN-PT) relaxor-PT single crystals. The secondary pyroelectric coefficients were calculated from the thermodynamic inter-relationship between the piezoelectric, elastic, and thermal expansion coefficients. Poling along [111] and [001] directions resulted in single-domain state of "1R" and "1T" and a macroscopic symmetry of 3m and 4mm for rhombohedral (x = 0.28) and tetragonal (x = 0.42) crystals, respectively, enabling relatively large values of pyroelectric coefficients p ≥ 5.7 × 10-4 C/m2 K. The calculated results show that the secondary pyroelectric coefficients are in the range of (-0.62 ∼ -1.06) × 10-4 C/m2 K for rhombohedral crystals and (0.70 ∼ 1.14) × 10-4 C/m2 K for tetragonal crystals, significantly lower than that of primary pyroelectric coefficients, which is important for thermal directional and imaging applications. In contrast, high d15 piezoelectric coefficients (>2000 pC/N), together with zero pyroelectric coefficients in thickness shear crystals, also makes them promising candidates for piezoelectric sensors where thermal noise is undesirable.

Original languageEnglish (US)
Article number084105
JournalJournal of Applied Physics
Volume114
Issue number8
DOIs
StatePublished - Aug 28 2013

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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