Effect of Poling Electric Field and Temperature Change on the Dielectric Anomalies of Relaxor Ferroelectric Strontium-Barium-Niobate Single Crystals

Abstract

The dielectric properties of the uniaxial relaxor ferroelectric SrxBa1−xNb2O6 with x = 0.75 were investigated along the polar [001] direction as a function of temperature. The capacitance maximum showed the frequency dispersion commonly observed in relaxors. Additional weak dielectric anomalies were observed in the paraelectric phase; they were only seen during the heating process and disappeared upon subsequent cooling. These were attributed to the existence of large polar clusters strongly pinned at defects and/or to random fields and their metastable characters. Aligning the ferroelectric domains along the polar axis at room temperature removed the high-temperature dielectric anomalies. The dependences of the capacitance and the dielectric maximum temperature on the magnitude of the poling field were investigated.

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Correspondence to Ghulam Shabbir.

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Shabbir, G., Ko, JH. & Kojima, S. Effect of Poling Electric Field and Temperature Change on the Dielectric Anomalies of Relaxor Ferroelectric Strontium-Barium-Niobate Single Crystals. J. Korean Phys. Soc. 73, 1561–1565 (2018). https://doi.org/10.3938/jkps.73.1561

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Keywords

  • Relaxor
  • SBN
  • Uniaxial
  • Dielectric
  • Random field