Abstract
Twelve modified figures of merit are studied for the first time for 2–2-type composites based on relaxor-ferroelectric single crystals such as [001]-poled (1 – x)Pb(A1/3Nb2/3)O3 – xPbTiO3, where A = Mg or Zn. These modified figures of merit are related to the piezoelectric coefficients d3j* of the composite (j = 1, 2 and 3) and characterise the effectiveness of energy harvesting and transduction along the three co-ordinate axes OXj of a piezoelectric composite under a constant mechanical stress or strain. The volume-fraction dependencies of the modified figures of merit are analysed for parallel-connected 2–2 and 2–2–0 composites, and the effect of porosity (i.e. the volume fraction and shape of air pores in each polymer layer) on these figures of merit is considered for 2–2–0 composites. Linkages between the modified figures of merit and traditional energy-harvesting figures of merit d3j*g3j* are discussed for the studied 2–2-type composites. New diagrams are developed to indicate important volume-fraction ranges that correspond to a large anisotropy of exemplar modified figures of merit. Due to the large effective parameters and large anisotropy of specific figures of merit, the studied composites are of interest in piezoelectric sensor, transducer and energy-harvesting applications.
| Original language | English |
|---|---|
| Article number | 125691 |
| Journal | Materials Chemistry and Physics |
| Volume | 279 |
| Early online date | 1 Jan 2022 |
| DOIs | |
| Publication status | Published - 1 Mar 2022 |
Bibliographical note
Funding Information:The authors would like to thank Prof. Dr. A.A. Nesterov, Prof. Dr. A.E. Panich and Prof. Dr. I.A. Parinov (Southern Federal University, Russia), and Prof. Dr. S.-H. Chang (National Kaohsiung University of Science and Technology, Taiwan, ROC) for their research interest in the field of advanced piezoelectric materials. Research was financially supported by Southern Federal University , grant No. VnGr-07/2020-04-IM ( Ministry of Science and Higher Education of the Russian Federation ). CRB acknowledges the Leverhulme Trust ( RGP-2018-290 ).
Funding Information:
The authors would like to thank Prof. Dr. A.A. Nesterov, Prof. Dr. A.E. Panich and Prof. Dr. I.A. Parinov (Southern Federal University, Russia), and Prof. Dr. S.-H. Chang (National Kaohsiung University of Science and Technology, Taiwan, ROC) for their research interest in the field of advanced piezoelectric materials. Research was financially supported by Southern Federal University, grant No. VnGr-07/2020-04-IM (Ministry of Science and Higher Education of the Russian Federation). CRB acknowledges the Leverhulme Trust (RGP-2018-290).
Keywords
- Figure of merit
- Piezo-active composite
- Porous polyurethane
- Relaxor-ferroelectric single crystal
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics