A system of hydrostatic parameters is studied in novel 2-0-2 composites that contain two lead-free piezoelectric single-crystal components.The ferroelectric domain-engineered alkali niobate-tantalate-based single-crys...A system of hydrostatic parameters is studied in novel 2-0-2 composites that contain two lead-free piezoelectric single-crystal components.The ferroelectric domain-engineered alkali niobate-tantalate-based single-crystal layer promotes large values of the piezoelectric coefficients g^(*)33 and g^(*)h,hydrostatic squared figure of merit d^(*)hg^(*)h,and hydrostatic electromechanical coupling factor k^(*)h of the composite wherein the 0-3 Li_(2)B_(4)O_(7)single crystal/polyethylene layers are adjacent to the aforementioned single-crystal layer.Hereby,the role of the elastic anisotropy of the 0-3 layer is emphasized.An orientation effect concerned with rotations of the crystallographic axes of the piezoelectric Li_(2)B_(4)O_(7)single crystal in the 0-3 layer is first studied.It is shown that the orientation of the crystallographic axis Z of the Li_(2)B_(4)O_(7)single crystal in the polymer matrix strongly influences the piezoelectric properties and hydrostatic parameters of the composite.Examples of the so-called waterfall-like orientation dependences of the hydrostatic parameters are analyzed.The composite based on the domain-engineered[Li_(x)(K_(1-y)Na_(y)_(1-x)](Nb_(1-z)Ta_(z)TO_(3):Mn single crystal is of interest due to g^(*)h~10^(2)mV·m/N,d^(*)hg^(*)h~10^(-10)Pa-1,and k^(*)h≈0.70-0.75 in the studied volume-fraction and orientation ranges,and these hydrostatic parameters are to be taken into account in the field of piezotechnical,hydroacoustic,and energy-harvesting applications.展开更多
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 crys...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 d_(3j)^(*),an anisotropy of the energy-harvesting figures of merit d_(3j)^(*)g_(3j)^(*) and the hydrostatic piezoelectric coefficient d_(h)^(*).An orientation of the main crystallographic axes in each polydomain single-crystal layer is described by anglesβandγ.Diagrams built for the first time show the(β,γ)regions,where a large anisotropy of d_(3j)^(*)(or d_(3j)^(*)g_(3j)^(*))is achieved,and where inequality d_(h)^(*)>1000 pC/N holds.A large local max d_(h)^(*)=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 d*33g*33=1.02.10−9 Pa−1.The aforementioned large parameters are to be of value in piezoelectric sensing,energy harvesting and hydroacoustics.展开更多
基金Research was financially supported by Southern Federal University,Grant No.VnGr/2020-04-IM(Ministry of Science and Higher Education of the Russian Federation).
文摘A system of hydrostatic parameters is studied in novel 2-0-2 composites that contain two lead-free piezoelectric single-crystal components.The ferroelectric domain-engineered alkali niobate-tantalate-based single-crystal layer promotes large values of the piezoelectric coefficients g^(*)33 and g^(*)h,hydrostatic squared figure of merit d^(*)hg^(*)h,and hydrostatic electromechanical coupling factor k^(*)h of the composite wherein the 0-3 Li_(2)B_(4)O_(7)single crystal/polyethylene layers are adjacent to the aforementioned single-crystal layer.Hereby,the role of the elastic anisotropy of the 0-3 layer is emphasized.An orientation effect concerned with rotations of the crystallographic axes of the piezoelectric Li_(2)B_(4)O_(7)single crystal in the 0-3 layer is first studied.It is shown that the orientation of the crystallographic axis Z of the Li_(2)B_(4)O_(7)single crystal in the polymer matrix strongly influences the piezoelectric properties and hydrostatic parameters of the composite.Examples of the so-called waterfall-like orientation dependences of the hydrostatic parameters are analyzed.The composite based on the domain-engineered[Li_(x)(K_(1-y)Na_(y)_(1-x)](Nb_(1-z)Ta_(z)TO_(3):Mn single crystal is of interest due to g^(*)h~10^(2)mV·m/N,d^(*)hg^(*)h~10^(-10)Pa-1,and k^(*)h≈0.70-0.75 in the studied volume-fraction and orientation ranges,and these hydrostatic parameters are to be taken into account in the field of piezotechnical,hydroacoustic,and energy-harvesting applications.
基金supported by the Southern Federal University(research topic“Development and Materials-Science Substantiation of the Creation of Materials and Products Based on Piezoelectric Ceramics Using Additive Technologies”,stage 2022,contract No.176/22-D,July 11th,2022).
文摘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 d_(3j)^(*),an anisotropy of the energy-harvesting figures of merit d_(3j)^(*)g_(3j)^(*) and the hydrostatic piezoelectric coefficient d_(h)^(*).An orientation of the main crystallographic axes in each polydomain single-crystal layer is described by anglesβandγ.Diagrams built for the first time show the(β,γ)regions,where a large anisotropy of d_(3j)^(*)(or d_(3j)^(*)g_(3j)^(*))is achieved,and where inequality d_(h)^(*)>1000 pC/N holds.A large local max d_(h)^(*)=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 d*33g*33=1.02.10−9 Pa−1.The aforementioned large parameters are to be of value in piezoelectric sensing,energy harvesting and hydroacoustics.
