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|High Performance Multilayer Piezoelectric and Magnetoelectric Textured Ceramics|
|Keywords: Textured ceramics, Multilayer, Cofiring|
|Vibration energy harvesting has gained tremendous attention in the last decade. Among various methodologies for harvesting vibration energy, the piezoelectric mechanism has been shown to provide advantages at micro-to-meso scale (Priya 2007). The performance of piezoelectric materials for mechanical to electrical conversion is generally characterized by piezoelectric charge/strain coefficient d and piezoelectric voltage coefficient g. Under given experimental conditions, a material with high (d ∙ g) product will generate high power (Priya 2010). However, there is fundamental challenge in achieving high d ∙ g coefficient in conventional piezoelectric materials because any increase in the piezoelectric constant (d) is always accompanied by the large increase in dielectric susceptibility (¦Å), thus, high d usually shows low g. By using templated grain growth (TGG) method, we have investigated a series of <001> textured PMN-PT/PZT piezoelectric ceramics with high d and g values having transduction coefficient magnitude comparable to that of <001> oriented single crystals (Yan 2012; Yan 2013). For on-resonance energy harvesting, high power textured Mn doped PMN-PZT piezoelectric materials were synthesized, which possess excellent ¡°hard¡± and ¡°soft¡± combinatory characteristics (Yan 2012). To further improve the energy harvesting efficiency of these materials, multilayer structure via low-temperature co-firing were synthesized. By increasing the capacity and charge generation, the multilayer textured piezoelectric ceramics showed promising properties for energy harvesting. A comparative analysis will be provided to identify the suitable piezoelectric materials for energy harvesting. Beside the vibration, unused power can be tapped from environment in the form of magnetic field available from machines, vehicles, and human activity. Via utilizing magnetoelectric composite, it is possible to harvest both magnetic and structure vibration energy. Here, we will show a high performance magnetoelectric composite material via low-temperature cofiring textured piezoelectric phase with magnetostrictive phase (Yan 2014).|
|Yongke Yan, Research Scientist