Frequency-dependent bifurcation point between field-cooled and zero-field-cooled dielectric constant of LiTaO3 nanoparticles embedded in amorphous SiO2

Kohiki, Shigemi; Kawakami, Shintaro; Nogami, Shinichiro; Takada, Syozo; Shimooka, Hirokazu; Okui, Masato; Fukushima, Sei; Mitome, Masanori; Bando, Yoshio
April 2004
Applied Physics Letters;4/26/2004, Vol. 84 Issue 17, p3385
Academic Journal
Splitting between the field-cooled dielectric constant and the zero-field-cooled dielectric constant was observed for a diluted system of LiTaO3 nanoparticles (diameter ≈30 Å) embedded in amorphous SiO2. At the applied field frequency of 100 kHz, the real part of the field-cooled dielectric constant diverged from that of the zero-field-cooled one at ≈380 °C. The bifurcation point of the history-dependent dielectric constant rose from ≈310 to ≈540 °C upon increasing the field frequency from 10 to 1000 kHz. Bulk LiTaO3 powders showed no splitting in the history-dependent dielectric constant and the maximum at 645 °C in the real part of the dielectric constant, despite the variation of frequency. Both the splitting of the history-dependent dielectric constant and the frequency dependence of the bifurcation point suggest that the LiTaO3 nanoparticles with a single-domain structure were in the superparaelectric state as a consequence of insignificant cooperative interactions among the nanoparticles in the diluted system. The energy barrier of ≈0.9 eV separating two (+p and -p) polarization states corroborated the potential of the LiTaO3 nanoparticle for ultrahigh-density recording media applications. © 2004 American Institute of Physics.


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