Researching | JAD Volume 12 Issue 2,2022

{ABi}_{2}

{Ta}_{2}

O

_{9}

Aurivillius phase: A comparative study of A-site cation size on structure, dielectric, optical properties

Ilona Bella, Tio Putra Wendari, Novesar Jamarun, Nandang Mufti, and Zulhadjri

In this study, the double-layered Aurivillius phases CaBi2Ta2O9 (CBT) and PbBi2Ta2O9 (PBT) were prepared through a hydrothermal route with NaOH as a mineralizer. XRD analysis confirmed that the CBT and PBT compounds were successfully formed and adopted an orthorhombic crystal structure with an A21am symmetry. Le Bail r

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2150030 (2022)

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Erbium upconversion luminescence from sol-gel derived multilayer porous inorganic perovskite film

M. V. Rudenko, N. V. Gaponenko, E. B. Chubenko, E. I. Lashkovskaya, K. V. Shustsikava, Yu. V. Radyush, V. D. Zhivulko, A. V. Mudryi, M. Wang, E. V. Monaico, M. V. Stepikhova, and A. N. Yablonskiy

Erbium-doped barium titanate (BaTiO3:Er) xerogel film with a thickness of about 500 nm was formed on the porous strontium titanate (SrTiO3) xerogel film on Si substrate after annealing at 800∘C or 900∘C. The elaborated structures show room temperature upconversion luminescence under 980 nm excitation with the photolumi

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2150031 (2022)

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Dispersion characteristics of complex electromechanical parameters of porous piezoceramics

I. A. Shvetsov, M. A. Lugovaya, M. G. Konstantinova, P. A. Abramov, E. I. Petrova, N. A. Shvetsova, and A. N. Rybyanets

In this paper, the results of experimental study of dispersion characteristics of complex electromechanical parameters of ferroelectrically “hard” porous piezoceramics based on PZT composition were presented. Experimental samples of porous piezoceramics were fabricated using a modified method of burning-out a pore form In this paper, the results of experimental study of dispersion characteristics of complex electromechanical parameters of ferroelectrically “hard” porous piezoceramics based on PZT composition were presented. Experimental samples of porous piezoceramics were fabricated using a modified method of burning-out a pore former. The complex constants of porous piezoceramics with relative porosity 16% and their frequency dependences were measured using the piezoelectric resonance analysis method. As a result of experimental studies, regions of elastic, piezoelectric and electromechanical dispersion, characterized by anomalies in the frequency dependences of the imaginary and real parts of the complex constants of porous piezoelectric ceramics were found. It was revealed also that the microstructural features of porous piezoceramics determine the character of frequency dependences of complex electromechanical parameters of porous piezoelectric ceramics. In conclusion, the microstructural and physical mechanisms of electromechanical losses and dispersion in porous piezoceramics were discussed.In this paper, the results of experimental study of dispersion characteristics of complex electromechanical parameters of ferroelectrically “hard” porous piezoceramics based on PZT composition were presented. Experimental samples of porous piezoceramics were fabricated using a modified method of burning-out a pore former. The complex constants of porous piezoceramics with relative porosity 16% and their frequency dependences were measured using the piezoelectric resonance analysis method. As a result of experimental studies, regions of elastic, piezoelectric and electromechanical dispersion, characterized by anomalies in the frequency dependences of the imaginary and real parts of the complex constants of porous piezoelectric ceramics were found. It was revealed also that the microstructural features of porous piezoceramics determine the character of frequency dependences of complex electromechanical parameters of porous piezoelectric ceramics. In conclusion, the microstructural and physical mechanisms of electromechanical losses and dispersion in porous piezoceramics were discussed..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2160004 (2022)

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Microstructure features of the BST/(Mg, Ln)-ceramic

K. P. Andryushin, A. V. Nagaenko, S. V. Khasbulatov, L. A. Shilkina, E. V. Glazunova, S. I. Dudkina, I. N. Andryushina, and L. A. Reznichenko

Solid solutions of the composition Ba1−x−y(Mg, Ln)xSryTiO3 (x = 0.01; 0.025; 0.04; y = 0.20; 0.50; 0.80; Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tu, Yb) were prepared by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology. The influence of rare-earth elements on the microstr Solid solutions of the composition Ba

{_{1 -}_{x}_{-}}_{y}

(Mg, Ln)

_{x}

{Sr}_{y}

TiO₃ (

x

= 0.01; 0.025; 0.04;

y

= 0.20; 0.50; 0.80; Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tu, Yb) were prepared by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology. The influence of rare-earth elements on the microstructure of the prepared ceramic samples was investigated. It was found that regardless of the type of modifiers introduced, the grain landscape of the studied solid solutions with different amounts of SrTiO₃ is refined (in the initial system, the average grain size,

\bar{d}

, at

x

= 0.20 is 6

μ

m; at

x

= 0.50 is 4

μ

m; at

x

= 0.80 is 18

μ

m) to crystallite sizes not exceeding (2-3)

μ

m, and compacted. The using of mechanical activation procedures leads to an even greater decrease in the size and an increase in the density of ceramics. The increasing in the concentration of modifiers in each group (within the considered range of dopant variation) against the background of such a fine-grained structure has little effect on the dynamics of changes in

\bar{d}

. It is concluded that it is advisable to use the data obtained in the development of functional materials based on BST/(Mg, Ln) and devices with the participation of these compositions.Solid solutions of the composition Ba

{_{1 -}_{x}_{-}}_{y}

(Mg, Ln)

_{x}

{Sr}_{y}

TiO₃ (

x

= 0.01; 0.025; 0.04;

y

= 0.20; 0.50; 0.80; Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tu, Yb) were prepared by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology. The influence of rare-earth elements on the microstructure of the prepared ceramic samples was investigated. It was found that regardless of the type of modifiers introduced, the grain landscape of the studied solid solutions with different amounts of SrTiO₃ is refined (in the initial system, the average grain size,

\bar{d}

, at

x

= 0.20 is 6

μ

m; at

x

= 0.50 is 4

μ

m; at

x

= 0.80 is 18

μ

m) to crystallite sizes not exceeding (2-3)

μ

m, and compacted. The using of mechanical activation procedures leads to an even greater decrease in the size and an increase in the density of ceramics. The increasing in the concentration of modifiers in each group (within the considered range of dopant variation) against the background of such a fine-grained structure has little effect on the dynamics of changes in

\bar{d}

. It is concluded that it is advisable to use the data obtained in the development of functional materials based on BST/(Mg, Ln) and devices with the participation of these compositions..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2160005 (2022)

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Microstructure characterization and properties of porous piezoceramics

N. A. Shvetsova, I. A. Shvetsov, M. A. Lugovaya, E. I. Petrova, and A. N. Rybyanets

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2160006 (2022)

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Dielectric properties of bismuth-containing pyrochlores: A comparative analysis

M. V. Talanov, E. V. Glazunova, V. I. Kozlov, S. P. Kubrin, A. A. Bush, V. M. Talanov, and K. E. Kamentsev

The comparative analysis of the dielectric properties of bismuth-containing pyrochlores with different manifestation of atomic order/disorder was carried out. We examined the dielectric properties (including behavior in electric fields) of two pyrochlore compounds: BZN (presumably a composition close to Bi1.5Zn0.5Nb1.5 The comparative analysis of the dielectric properties of bismuth-containing pyrochlores with different manifestation of atomic order/disorder was carried out. We examined the dielectric properties (including behavior in electric fields) of two pyrochlore compounds: BZN (presumably a composition close to

{Bi}_{1.5}

{Zn}_{0.5}

{Nb}_{1.5}

O_{6.5})

ceramics with chemical disorder in both A and B cation sublattices and Bi₂Ti₂O₇ single crystal with fully chemical ordered structure. The fundamental differences between the dielectric properties of the BZN ceramics and Bi₂Ti₂O₇ single crystal were shown. In particular, in the dielectric relaxation behavior (which cannot be described via Arrhenius law in the Bi₂Ti₂

O_{7})

or in the influence of the electric fields on the dielectric permittivity (splitting of the field-cooled and zero-field-cooled behaviors was observed for Bi₂Ti₂O₇ below estimated freezing temperature). The results of this study highlights the special role of Bi₂Ti₂O₇ as a candidate material for studying aspects of geometric frustration related with pyrochlore structure in non-magnetic medium and specifies the future directions of research.The comparative analysis of the dielectric properties of bismuth-containing pyrochlores with different manifestation of atomic order/disorder was carried out. We examined the dielectric properties (including behavior in electric fields) of two pyrochlore compounds: BZN (presumably a composition close to

{Bi}_{1.5}

{Zn}_{0.5}

{Nb}_{1.5}

O_{6.5})

ceramics with chemical disorder in both A and B cation sublattices and Bi₂Ti₂O₇ single crystal with fully chemical ordered structure. The fundamental differences between the dielectric properties of the BZN ceramics and Bi₂Ti₂O₇ single crystal were shown. In particular, in the dielectric relaxation behavior (which cannot be described via Arrhenius law in the Bi₂Ti₂

O_{7})

or in the influence of the electric fields on the dielectric permittivity (splitting of the field-cooled and zero-field-cooled behaviors was observed for Bi₂Ti₂O₇ below estimated freezing temperature). The results of this study highlights the special role of Bi₂Ti₂O₇ as a candidate material for studying aspects of geometric frustration related with pyrochlore structure in non-magnetic medium and specifies the future directions of research..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2160017 (2022)

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Impact of laser pulse repetition frequency on nucleation and growth of LiNbO

_{3}

thin films

Z. Vakulov, D. Khakhulin, A. Geldash, R. V. Tominov, V. S. Klimin, V. A. Smirnov, and O. A. Ageev

This paper reports the impact of the laser pulse repetition frequency on growth processes, morphological and electro-physical parameters of nanocrystalline LiNbO3 thin films obtained by the pulsed laser deposition technique. It was found that the nucleation process in LiNbO3 films could controllably change by increasin

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2160019 (2022)

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Enhanced piezoelectric properties in low-temperature sintering PZN-PZT ceramics by adjusting Zr/Ti ratio

Yaxia Luo, Tao Pu, Shibo Fan, Hong Liu, and Jianguo Zhu

Pb0.96Sr0.04(Zr,Ti)0.7(Zn1/3Nb2/3)0.3O3 (PZN–PZT) piezoceramics with various Zr/Ti ratios and Li2CO3 sintering aid were sintered at 900∘C by the solid-state reaction route. The samples with different Zr/Ti ratios were compared according to microstructure, phase structure, piezoelectricity, ferroelectricity, and dielect

{Pb}_{0.96}

{Sr}_{0.04}

(

{Zr}_{,}

Ti)

_{0.7}

(

{Zn}_{1 / 3}

{Nb}_{2 / 3})_{0.3}

O₃ (PZN–PZT) piezoceramics with various Zr/Ti ratios and Li₂CO₃ sintering aid were sintered at 900^∘C by the solid-state reaction route. The samples with different Zr/Ti ratios were compared according to microstructure, phase structure, piezoelectricity, ferroelectricity, and dielectric relaxation. The Zr/Ti ratio in the PZN–PZT ceramics greatly affects the electrical properties. The Zr/Ti ratio affects the proportion between the rhombohedral and tetragonal phases and also affects the grain size. The PZN–PZT ceramics with the Zr/Ti ratio of 53:47 have the largest grain size and have optimized piezoelectric properties (

k_{p}

= 0.58,

d_{33}

= 540 pC/N, and

T_{C}

= 250^∘C). The larger the grain size, the lesser the grain boundary, the easier the domain wall motion, and the better the piezoelectric properties. The PZT ceramic with Zr/Ti ratio of 53:47 locates the morphotropic phase boundary (MPB) region which is one of the key factors for the high piezoelectric properties of the PZT.

{Pb}_{0.96}

{Sr}_{0.04}

(

{Zr}_{,}

Ti)

_{0.7}

(

{Zn}_{1 / 3}

{Nb}_{2 / 3})_{0.3}

O₃ (PZN–PZT) piezoceramics with various Zr/Ti ratios and Li₂CO₃ sintering aid were sintered at 900^∘C by the solid-state reaction route. The samples with different Zr/Ti ratios were compared according to microstructure, phase structure, piezoelectricity, ferroelectricity, and dielectric relaxation. The Zr/Ti ratio in the PZN–PZT ceramics greatly affects the electrical properties. The Zr/Ti ratio affects the proportion between the rhombohedral and tetragonal phases and also affects the grain size. The PZN–PZT ceramics with the Zr/Ti ratio of 53:47 have the largest grain size and have optimized piezoelectric properties (

k_{p}

= 0.58,

d_{33}

= 540 pC/N, and

T_{C}

= 250^∘C). The larger the grain size, the lesser the grain boundary, the easier the domain wall motion, and the better the piezoelectric properties. The PZT ceramic with Zr/Ti ratio of 53:47 locates the morphotropic phase boundary (MPB) region which is one of the key factors for the high piezoelectric properties of the PZT..

Journal of Advanced Dielectrics

Publication Date: Jan. 01, 1900
Vol. 12, Issue 2, 2250001 (2022)

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