Researching | JAD Volume 11 Issue 5,2021

Features of the electrophysical and mechanical properties of

n

-component ferroactive solid solutions of composition PZT–PZN–PMN

K. P. Andryushin, I. N. Andryushina, A. V. Cherpakov, A. V. Popov, I. A. Verbenko, and L. A. Reznichenko

Study of the fatigue endurance and mechanical strength of solid solutions of the PZT–PZN–PMN system, modified with Ba and Sr, corresponding to the formula (Pb1−α1−α2Srα1Baα1) [TixZry〈(Nb2/3Zn1/3) (Nb2/3Mg1/3)〉1−x−y]O3, with α1 = 0.02 ÷ 0.12; Δα1 = 0.02, α2 = 0.0036 ÷ 0.073; x= 0.385 ÷ 0.430, y= 0.402

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160001 (2021)

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Comparative study on the performance of piezo-active 1–3-type composites with lead-free components

Ashura N. Isaeva, and Vitaly Yu. Topolov

Piezoelectric properties and related figures of merit are studied in novel 1–3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient d33. Relationships between the piezoelectric properties and the set of figures of merit are an Piezoelectric properties and related figures of merit are studied in novel 1–3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient

d_{33}

. Relationships between the piezoelectric properties and the set of figures of merit are analyzed for the 1–3 and 1–3–0 composites that contain the same single-crystal and polymer components. For a composite characterized by 1–3–0 connectivity, an influence of a porous piezo-passive matrix on the figures of merit and their volume-fraction behavior is considered additionally. A large anisotropy of figures of merit is observed in the 1–3–0 composite with specific porous matrices. A diagram is put forward to show volume-fraction regions of the large anisotropy of figures of merit of the studied 1–3–0 composite. Due to large figures of merit and their considerable anisotropy, the studied lead-free composites can be applied in piezoelectric energy-harvesting systems, sensors, transducers, and so on.Piezoelectric properties and related figures of merit are studied in novel 1–3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient

d_{33}

. Relationships between the piezoelectric properties and the set of figures of merit are analyzed for the 1–3 and 1–3–0 composites that contain the same single-crystal and polymer components. For a composite characterized by 1–3–0 connectivity, an influence of a porous piezo-passive matrix on the figures of merit and their volume-fraction behavior is considered additionally. A large anisotropy of figures of merit is observed in the 1–3–0 composite with specific porous matrices. A diagram is put forward to show volume-fraction regions of the large anisotropy of figures of merit of the studied 1–3–0 composite. Due to large figures of merit and their considerable anisotropy, the studied lead-free composites can be applied in piezoelectric energy-harvesting systems, sensors, transducers, and so on..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160003 (2021)

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Specific features of SH-waves propagation in structures with prestressed inhomogeneous coating made of piezoceramics based on LiNbO₃

T. I. Belyankova, E. I. Vorovich, V. V. Kalinchuk, and O. M. Tukodova

Within the framework of the linearized theory of electroelastic wave propagation, a model of a piezoelectric structure with a prestressed functionally graded coating made of piezoceramics of a trigonal system with a symmetry class of 3m is considered. The ferroelectric LiNbO3 is used as the main material of the structu Within the framework of the linearized theory of electroelastic wave propagation, a model of a piezoelectric structure with a prestressed functionally graded coating made of piezoceramics of a trigonal system with a symmetry class of 3m is considered. The ferroelectric LiNbO₃ is used as the main material of the structure. The initial deformed state of the coating material is homogeneous, induced by the action of initial mechanical stresses and an external electrostatic field, the properties of the coating continuously change in thickness. By the example of the problem of the propagation of SH-waves from a remote source for structures with an inhomogeneous prestressed coating in the case of an electrically free and short-circuited surface, the influence of the nature and localization of the inhomogeneity of the coating on the features of SAW propagation is studied. The separate and combined effects of initial actions on changes in the physical properties of the structure, the transformation of the surface wave field, and the change in the SAW velocities in a wide frequency range is studied. The results obtained in this work are useful for understanding the dynamic processes in prestressed piezoelectric structures, in the optimization and design of new structures and devices on SAW with high performance characteristics.Within the framework of the linearized theory of electroelastic wave propagation, a model of a piezoelectric structure with a prestressed functionally graded coating made of piezoceramics of a trigonal system with a symmetry class of 3m is considered. The ferroelectric LiNbO₃ is used as the main material of the structure. The initial deformed state of the coating material is homogeneous, induced by the action of initial mechanical stresses and an external electrostatic field, the properties of the coating continuously change in thickness. By the example of the problem of the propagation of SH-waves from a remote source for structures with an inhomogeneous prestressed coating in the case of an electrically free and short-circuited surface, the influence of the nature and localization of the inhomogeneity of the coating on the features of SAW propagation is studied. The separate and combined effects of initial actions on changes in the physical properties of the structure, the transformation of the surface wave field, and the change in the SAW velocities in a wide frequency range is studied. The results obtained in this work are useful for understanding the dynamic processes in prestressed piezoelectric structures, in the optimization and design of new structures and devices on SAW with high performance characteristics..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160007 (2021)

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SnO₂–ZnO nanocomposite thin films: The influence of structure, composition and crystallinity on optical and electrophysical properties

E. M. Bayan, V. V. Petrov, M. G. Volkova, V. Yu Storozhenko, and A. V. Chernyshev

SnO2–ZnO thin films consisting of nanoscale crystallites were obtained on glass and silicon substrates by solid-phase low-temperature pyrolysis. The synthesized materials were studied by XRD and SEM methods, electrophysical and optical properties were evaluated, as well as the band gap was calculated. It was shown that

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160008 (2021)

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Numerical investigation of the effects of partial metallization at the pore surface on the effective properties of a porous piezoceramic composite

Andrey Nasedkin, and Mohamed Elsayed Nassar

This paper presents a numerical homogenization analysis of a porous piezoelectric composite with a partially metalized pore surface. The metal layers can be added to the pore surfaces to improve the mechanical and electromechanical properties of ordinary porous piezocomposites. Physically, constructing that composite w This paper presents a numerical homogenization analysis of a porous piezoelectric composite with a partially metalized pore surface. The metal layers can be added to the pore surfaces to improve the mechanical and electromechanical properties of ordinary porous piezocomposites. Physically, constructing that composite with completely metalized pore surfaces is a challenging process, and imperfect metallization is more expected. Here, we investigate the effects of possible incomplete metallization of pore surfaces on the composite’s equivalent properties. We applied the effective moduli theory, which was developed for the piezoelectric medium based on the Hill–Mandel principle, and the finite element method to compute the effective moduli of the considered composites. Using specific algorithms and programs in the ANSYS APDL programming language, we constructed the representative unit cell element models and performed various computational experiments. Due to the presence of metal inclusion, we found that the dielectric and piezoelectric properties of the considered composites differ dramatically from the corresponding properties of the ordinary porous piezocomposites. The results of this work showed that piezocomposites with partially metallized pore surfaces can have a higher anisotropy, compared to the pure piezoceramic matrix, due to the defects in metal coatings.This paper presents a numerical homogenization analysis of a porous piezoelectric composite with a partially metalized pore surface. The metal layers can be added to the pore surfaces to improve the mechanical and electromechanical properties of ordinary porous piezocomposites. Physically, constructing that composite with completely metalized pore surfaces is a challenging process, and imperfect metallization is more expected. Here, we investigate the effects of possible incomplete metallization of pore surfaces on the composite’s equivalent properties. We applied the effective moduli theory, which was developed for the piezoelectric medium based on the Hill–Mandel principle, and the finite element method to compute the effective moduli of the considered composites. Using specific algorithms and programs in the ANSYS APDL programming language, we constructed the representative unit cell element models and performed various computational experiments. Due to the presence of metal inclusion, we found that the dielectric and piezoelectric properties of the considered composites differ dramatically from the corresponding properties of the ordinary porous piezocomposites. The results of this work showed that piezocomposites with partially metallized pore surfaces can have a higher anisotropy, compared to the pure piezoceramic matrix, due to the defects in metal coatings..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160009 (2021)

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Optimizing VO₂ film properties for use in SAW devices

M. E. Kutepov, G. Ya. Karapetyan, I. V. Lisnevskaya, K. G. Abdulvakhidov, A. A. Kozmin, and E. M. Kaidashev

The aim of this study is to optimize the conditions for producing thin VO2 films for their use in SAW devices. We used the pulsed laser deposition (PLD) method to produce VO2 films. We used a metallic vanadium target. The dependence of the oxygen pressure during PLD on the resistive metal–insulator transition (MIT) on

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160012 (2021)

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Optical properties of

{Sr}_{x}

Ba

{_{1 -}}_{x}

{Nb}_{2}

O₆ nanoscale films (

x

= 0.5 and 0.61) grown by RF-cathode sputtering in an oxygen atmosphere

S. V. Kara-Murza, K. M. Zhidel, N. V. Korchikova, Yu. V. Tekhtelev, A. V. Pavlenko, and L. I. Kiseleva

The research findings of the phase composition, nanostructure and optical properties of strontium–barium niobate thin films are discussed. SrxBa1−xNb2O6 nanosized films (x = 0.5 and 0.61) were characterized by XRD, SEM and AFM studies. Reflective multi-angle ellipsometry and spectrophotometry were used to determine the

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160014 (2021)

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Dielectric and piezoelectric properties of modified lead-free NaNbO₃–KNbO₃/PVDF composite ceramics

Y. I. Yurasov, M. I. Tolstunov, A. V. Nazarenko, A. A. Pavelko, A. V. Yudin, I. A. Verbenko, and L. A. Reznitchenko

This work presents the results of study of the electrophysical properties of composite polymer ceramics (1?x)[KNN-LTSN]–xPVDF at x = 25 vol.% and x= 50 vol.% in the temperature range of T = 20–160°C and frequency range of f = 2 × 101–2 × 106 Hz. The concentration dependence of piezomodules of the studied This work presents the results of study of the electrophysical properties of composite polymer ceramics (1

? x)

[KNN-LTSN]–

x

PVDF at

x

= 25 vol.% and

x

= 50 vol.% in the temperature range of

T

= 20–160

^{°}

C and frequency range of

f

= 2 × 10¹–2 × 10⁶ Hz. The concentration dependence of piezomodules of the studied materials has been analyzed as a function of temperature. X-ray measurements have also been carried out. A model of description of revealed dielectric parameters dispersion in the material is presented. The nonclassical modified Havriliak–Negami model written for complex electrical conductivity has been used to describe the temperature–frequency properties. It is shown that the dielectric spectra of the studied composites include three relaxation processes in the temperature ranges of 40–80

^{°}

C, 80–120

^{°}

C and 120–150

^{°}

C, which were confirmed by the dynamics of changes in the dependences of

{γ^{'}}^{(} f)

, tg

δ (f)

,

{M^{'}}^{(} f)

,

M^{′′}

(

f

) and

M ′′

(

M')

. All three processes are almost exactly described by this model and well correlated with the studies by other researchers of the composites based on PVDF. The results of this work show that the use of such experimental model is suitable for describing the complex dielectric spectra of any nonlinear dielectrics including composite materials.This work presents the results of study of the electrophysical properties of composite polymer ceramics (1

? x)

[KNN-LTSN]–

x

PVDF at

x

= 25 vol.% and

x

= 50 vol.% in the temperature range of

T

= 20–160

^{°}

C and frequency range of

f

= 2 × 10¹–2 × 10⁶ Hz. The concentration dependence of piezomodules of the studied materials has been analyzed as a function of temperature. X-ray measurements have also been carried out. A model of description of revealed dielectric parameters dispersion in the material is presented. The nonclassical modified Havriliak–Negami model written for complex electrical conductivity has been used to describe the temperature–frequency properties. It is shown that the dielectric spectra of the studied composites include three relaxation processes in the temperature ranges of 40–80

^{°}

C, 80–120

^{°}

C and 120–150

^{°}

C, which were confirmed by the dynamics of changes in the dependences of

{γ^{'}}^{(} f)

, tg

δ (f)

,

{M^{'}}^{(} f)

,

M^{′′}

(

f

) and

M ′′

(

M')

. All three processes are almost exactly described by this model and well correlated with the studies by other researchers of the composites based on PVDF. The results of this work show that the use of such experimental model is suitable for describing the complex dielectric spectra of any nonlinear dielectrics including composite materials..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160015 (2021)

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Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi

{_{3 -}}_{x}

{Gd}_{x}

TiTaO₉ (x = 0.0, 0.1, 0.2, 0.3) with high Curie temperature

S. V. Zubkov

The Aurivillius phases [Bi2O2][An−1BnO3n+1] are well-known ferroelectrics with high Curie temperatures TC. High-temperature piezoceramics Bi3−xGdxTiTaO9 (BGdTTa, x= 0.0, 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BGdTTa ceramics have been studied

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160016 (2021)

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Structure and dielectric properties of solid solutions Bi

{_{7 - 2}}_{x}

Nd

{_{2}}_{x}

Ti₄

{NbO}_{21}

(x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0)

S. V. Zubkov

The electrophysical and structural characteristics of bismuth titanate oxides of a number of phases of solid solutions of the Aurivillius phases Bi7−2xNd2xTi4NbO21 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) having a layered structure of the perovskite type have been investigated. According to the XRD data, all studied compound The electrophysical and structural characteristics of bismuth titanate oxides of a number of phases of solid solutions of the Aurivillius phases Bi

{_{7 - 2}}_{x}

Nd

{_{2}}_{x}

Ti₄

{NbO}_{21}

(

x

= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) having a layered structure of the perovskite type have been investigated. According to the XRD data, all studied compounds are single-phase and have a mixed-layer structure of Aurivillius phases (

m

= 2.5) with a rhombic crystal lattice (space group I2cm,

Z

= 2). A relationship has been established between changes in the chemical composition of solid solutions and orthorhombic and tetragonal distortions of perovskite-like layers. The temperature dependences of the relative permittivity

𝜀

/

𝜀_{o}

(T) are measured. It was found that the change in the phase transition temperature — Curie temperature

T_{C}

synthesized Aurivillius phases Bi

{_{7 -}}_{x}

Nd

{_{2}}_{x}

Ti₄

{NbO}_{21}

(

x

= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) has a close to linear dependence on the change in the parameter

x

. The activation energies of charge carriers in different temperature ranges were calculated. It was found that three clearly defined temperature ranges with different activation energies can be distinguished, which is associated with the different nature of charge carriers in the studied solid solutions of the perovskite type. The effect of substitution of Nd

^{3 +}

ions for Bi

^{3 +}

ions is investigated.The electrophysical and structural characteristics of bismuth titanate oxides of a number of phases of solid solutions of the Aurivillius phases Bi

{_{7 - 2}}_{x}

Nd

{_{2}}_{x}

Ti₄

{NbO}_{21}

(

x

= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) having a layered structure of the perovskite type have been investigated. According to the XRD data, all studied compounds are single-phase and have a mixed-layer structure of Aurivillius phases (

m

= 2.5) with a rhombic crystal lattice (space group I2cm,

Z

= 2). A relationship has been established between changes in the chemical composition of solid solutions and orthorhombic and tetragonal distortions of perovskite-like layers. The temperature dependences of the relative permittivity

𝜀

/

𝜀_{o}

(T) are measured. It was found that the change in the phase transition temperature — Curie temperature

T_{C}

synthesized Aurivillius phases Bi

{_{7 -}}_{x}

Nd

{_{2}}_{x}

Ti₄

{NbO}_{21}

(

x

= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) has a close to linear dependence on the change in the parameter

x

. The activation energies of charge carriers in different temperature ranges were calculated. It was found that three clearly defined temperature ranges with different activation energies can be distinguished, which is associated with the different nature of charge carriers in the studied solid solutions of the perovskite type. The effect of substitution of Nd

^{3 +}

ions for Bi

^{3 +}

ions is investigated..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 11, Issue 5, 2160018 (2021)

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