Vibration-energy-harvesting properties of hydrothermally synthesized (K,Na)NbO3 films deposited on flexible metal foil substrates

Takahisa Shiraishi, Noriyuki Kaneko, Minoru Kurosawa, Hiroshi Uchida, Yasuhiro Suzuki, Takeshi Kobayashi, Hiroshi Funakubo

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18 Citations (Scopus)


Energy-harvesting properties were investigated for the flexible piezoelectric devices, Pt/hydrothermally synthesized (K0.88Na0.12)NbO3/SrRuO3/ metal foil, fabricated at low process temperatures below 300 °C. Fabricated devices had high flexibility, and cracking and peeling were not observed under the bending condition with the maximum curvature of 5.2mm. The estimated Young's modulus of the fabricated flexible devices was 37GPa. The pulse poling treatment with AC voltage above 150 V enhanced the energy-harvesting properties. Although the dielectric constant was almost unchanged (εr = 120 at 200 Hz), the maximum output voltage measured at an acceleration of 10m/s2 was observed at a resonance frequency of 126 Hz, and this voltage increased from 7.2 to 11 V after pulse poling treatment at 200V. The maximum output power was 7.7 μWat a load resistance of 560 kO. The calculated Q and K2 values were 30 and 0.0014, respectively. The power density was 1.8μW/(G2mm3), which is higher than the previous reports for films and sintered bodies of (KxNa1-x) fabricated above 500 °C.

Original languageEnglish
Article number10ND06
JournalJapanese journal of applied physics
Issue number10
Publication statusPublished - 2015 Oct 1
Externally publishedYes

ASJC Scopus subject areas

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


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