Domain orientations and piezoelectric properties in novel 2-2-type composites with two single-crystal components

• Published in: Ferroelectrics Vol. 543; no. 1; pp. 115 - 129
• Main Authors: Topolov, V. Yu, Krivoruchko, A. V., Bowen, C. R., Panich, A. A.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 26-04-2019; Taylor & Francis Ltd
• Subjects: Anisotropy; anisotropy factors; Composite materials; Crystallography; Energy harvesting; Ferroelectric materials; Ferroelectricity; Figure of merit; hydrostatic parameters; Lithium borates; orientation effect; Orientation effects; Parallel connected; Parameters; Piezo-active composite; piezoelectric properties; Piezoelectricity; Polyethylenes; relaxor ferroelectric; Single crystals
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150193.2019.1592424

The present paper is concerned with the piezoelectric properties and related parameters of the 2-2-type parallel-connected composites wherein rotations of the main crystallographic axes in ferroelectric single crystal components are analyzed. The composite consists of layers of two types that are regularly arranged along the non-polar axis. The Type I layer is a single domain 0.63Pb(Mg
1/3
Nb
2/3
)O
3
-0.37PbTiO
3
single crystal (either tetragonal in Composite I or orthorhombic in Composite II). The Type II layer is a Li
2
B
4
O
7
single crystal/polyethylene medium with 0-3 connectivity. The composite as a whole is characterized by 2-0-2 connectivity. The following parameters of the composite are studied by taking into account the polarization orientation effect in the Type I layer and the microgeometry of the composite in the Type II layer: piezoelectric coefficients
and
their hydrostatic analogs
and
hydrostatic squared figure of merit
piezoelectric anisotropy factors
/
and
/
It is shown that large values of the studied piezoelectric coefficients, hydrostatic parameters and anisotropy factors make Composite II more preferable in comparison to Composite I for hydroacoustic, piezoelectric sensor and energy-harvesting applications.