Details

Autor(en) / Beteiligte

• Zhang, J. L.
• Ji, P. F.
• Wu, Y. Q.
• Zhao, X.
• Tan, Y. Q.
• Wang, C. L.

Titel

Strong piezoelectricity exhibited by large-grained BaTiO3 ceramics

Ist Teil von

• Applied physics letters, 2014-06, Vol.104 (22)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2014

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• A good understanding of the strong piezoelectric mechanism of BaTiO3 ceramics is very important from both scientific and technological viewpoints. This Letter reports an unusual piezoelectric phenomenon observed in a group of large-grained dense BaTiO3 ceramics with average grain sizes ranging from 5.1 to 16.3 μm, which are prepared with a hydrothermally synthesized BaTiO3 fine powder by hot-press sintering. Among these BaTiO3 ceramics, the one possessing an average grain size of 5.6 μm exhibits a particularly prominent piezoelectricity with piezoelectric constants d33 = 485 pC/N and d33* = 725 pm/V at room temperature and a peak d33 value of 574 pC/N around 8.5 °C. This ceramic is further investigated from the aspects of domain patterns and polarization versus electric field (P-E) loops and compared with a conventionally sintered BaTiO3 ceramic prepared using a solid-state reaction method. The investigation shows that it has the domain patterns of simple parallel stripes inside the grains and the square-like P-E loops and differs significantly from the conventionally sintered ceramic, and indicates that the observed strong piezoelectricity is strongly related to the large remanent polarization.