The polarization orientation effect and porosity effect on the piezoelectric properties and related parameters are studied in 2–2-type composites based on domain-engineered relaxor-ferroelectric [011]-poled single crystals. The parameters, which are of great interest, are an anisotropy of the piezoelectric coefficients d3j*, an anisotropy of the energy-harvesting figures of merit d3j*g3j* and the hydrostatic piezoelectric coefficient dh*. An orientation of the main crystallographic axes in each polydomain single-crystal layer is described by angles β and γ. Diagrams built for the first time show the (β,γ) regions, where a large anisotropy of d3j* (or d3j*g3j*) is achieved, and where inequality dh*> 1000 pC/N holds. A large local max dh* = 1930 pC/N is achieved in a 2–2–0 PZN–0.065PT-based composite at the longitudinal piezoelectric coefficient d33* = 2290 pC/N and figure of merit d33*g33* = 1.02.10− 9 Pa− 1. The aforementioned large parameters are to be of value in piezoelectric sensing, energy harvesting and hydroacoustics.

通过数值模拟的方法研究了H2+阈下谐波的取向效应. 数值模拟过程中, 主要关注波长为760 nm的阈下谐波, 通过逐次减去激发态贡献的方法, 研究共振相关谐波不同取向角下的变化规律.结果表明: 阈下平行、垂直谐波展示的复杂取向依赖与共振效应密切相关, 该现象主要由与基态共振的各激发态的轴对称性导致. 另外, 用包含跃迁偶极子的简单模型对取向效应进行了概括描述, 并以H2+第一激发态为演化初始态进行了验证. 本文结果可为阈下谐波取向效应的实验研究提供参考.