Dielectric and piezoelectric properties of BiScO3-PbTiO 3 crystals with morphotropic phase boundary composition

Shujun Zhang, Clive A. Randall, Thomas R. Shrout

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Abstract

The room temperature dielectric permittivity of [100] oriented 0.37BiScO3-0.63PbTiO3 (BSPT63) crystals with a morphotropic phase boundary (MPB) composition was found to be 1400, lower than that of BSPT57 crystals with rhombohedral phase (∼3000), but much higher than that of the tetragonal crystal BSPT66 (∼200). The Curie temperature of BSPT63 single crystals along [100] was found to be about 443°C, while the values were around 440°C and 445°C for [110] and [111] oriented crystals, respectively. Evidence of a ferroelectric-ferroelectric phase transformation temperature was associated with a dielectric anomaly occurring around 310-350°C for different orientations, indicating a strong curvature of the MPB. The coercive fields (Ec) were found to be 20kV/cm for [100] oriented crystals, 24kV/cm and 27kV/cm for [110] and [111] directions, respectively. The piezoelectric response for [100] oriented samples (d 33 = 900pC/N) is weaker than that in rhombohedral phase (d 33 = 1200pC/N) but much higher than that in tetragonal phase (d 33 =200 pC/N). The strain piezoelectric d33 improved with the temperature increasing owing to dielectric permittivity increment, while the voltage piezoelectric g33 is independent of temperature (g 33 ∼0.074 m2/C). Evidence of a monoclinic phase for BSPT63 crystals is inferred using the X-ray powder diffraction (XRD), and the lattice parameters were calculated to be a = 4.0751 Å, b = 3.9765 Å, c = 3.9893 Å and β= 90.166°.

Original languageEnglish (US)
Pages (from-to)6199-6203
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number9 A
DOIs
StatePublished - Sep 1 2004

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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