Domain switching and creep behavior of a poled PZT wafer under through-thickness electric fields at high temperatures

Kim, Sang-Joo; Kim, Ju Hong; Lee, Chang-Hoan

doi:10.1016/j.actamat.2009.12.011

Cited by 21 publications

(19 citation statements)

References 14 publications

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“…But relaxation properties of materials after the removal of external physical actions have been studied insufficiently till this date. [5][6][7][8][9] The aim of the present paper is to study the properties of PZT-based piezoelectric ceramics after the termination of the action of external thermodynamic parameters such as DC electric field, temperature, uniaxial stress and their combinations. We pay main attention to sample heating for external effect.…”

Section: Introductionmentioning

confidence: 99%

F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

Ishchuk¹,

Kuzenko²

2015

J. Adv. Dielect.

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Results of experimental investigation of relaxation aging processes in Pb(Zr,Ti)O 3 -based solid solutions after termination of external actions are presented. Heating, DC electric field, uniaxial pressure and some of their combinations were taken as external actions. In the main part of the present paper, we use heating as external action. The said processes are long-time one and are described by the logarithmic function of time.Reversible and nonreversible relaxation processes take place depending on the action intensity. The relaxation rate depends on the action intensity also, and the said dependence has nonlinear and nonmonotonic form if external action leads to domain disordering.The oxygen vacancies-based model for description of the long-time relaxation processes is suggested. The model takes into account oxygen vacancies on the sample's surface ends, their conversion into F þ -and F 0 -centers under external effects (due to the liberation of the pyroelectric charge) and subsequent relaxation of these centers into the simple oxygen vacancies after the actions termination. The initial sample's state is electroneutrality one. F-center formation leads to the violation of the original sample's electroneutrality, and generates DC electric field into the sample. Relaxation of F-centers is accompanied by decreasing of electric field, induced by them, and dielectric constant relaxation as consequent effect.

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Section: Introductionmentioning

confidence: 99%

F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

Ishchuk¹,

Kuzenko²

2015

J. Adv. Dielect.

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“…At the very beginning of the electro-superplastic solid-state welding process, lots of concentrated vacancies exist at the interface of 40Cr steel and QCr0.5 copper alloy. Vacancies in a metal lattice have a negative charge [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 15 , 16 , 17 , 18 ], and an electrical field can alter the electrochemical potential of materials [ 12 , 13 , 14 , 15 , 16 , 24 ]. The charged layer of the metal surface forms in an external electrical field, which can improve vacancy mobility.…”

Section: Resultsmentioning

confidence: 99%

“…An electrical field has been found to be able to enhance superplastic deformation of materials [ 9 , 13 , 14 , 15 , 17 , 18 ]. Larger superplastic deformation means more grain boundary sliding and dislocation movement.…”

Section: Resultsmentioning

confidence: 99%

“…An external electrical field is known to be able to significantly influence the superplastic deformation and the distribution of vacancy concentration of different materials [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Some studies have shown that an electrical field can reduce the flow stress and strain-hardening rate (or accelerate strain-softening), as well as significantly suppressing the movement of cavitation during superplastic deformation [ 13 , 14 , 15 , 16 , 17 , 18 ]. Meanwhile, Cao et al [ 19 ] found that the electric field could increase the room temperature tensile strength and elongation, and there may also be a prevention of the growth of crystal grains as well as reduction of the volume fraction of voids on the grain boundary by adopting the electric field during the superplastic deformation of 7475 aluminum alloy [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Electro-Superplastic Solid State Welding of 40Cr/QCr0.5

Wang

Zhang

2018

Materials

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Hot-squeezed chrome bronze QCr0.5 and ultra-fine treated 40Cr steel have been successfully welded using an electro-superplastic solid-state welding technique. Results have shown that the tensile strength of a 40Cr/QCr0.5 weld joint can be greatly increased, up to or exceeding that of QCr0.5 base metal. The weld interface between 40Cr and QCr0.5 has achieved metallurgical bonding and there are less micro-gaps, thicker transition regions and more copper convexes and dimples on the fracture surface of the 40Cr side when applying an external electrical field of E = 3 kV/cm, as well as with other welding parameters, including no vacuum, no shield gas, a pre-pressure of 56.6 MPa, an initial strain rate of 1.5 × 10−4 s−1, a pressure welding temperature of 710–800 °C, and a pressure welding time of 0–8 min.

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“…But relaxation properties of materials after the removal of external physical actions have been studied insufficiently till this date. [6][7][8][9][10] Now knowledge about mechanisms of after-effect relaxation processes in ceramic piezoelectric materials is less.…”

Section: Introductionmentioning

confidence: 99%

F-centers mechanism of long-term relaxation in lead zirconate-titanate based piezoelectric ceramics. 2. After-field relaxation

Ishchuk¹,

Kuzenko²

2016

J. Adv. Dielect.

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The paper presents results of experimental study of the dielectric constant relaxation during aging process in Pb(Zr,Ti)O 3 based solid solutions (PZT) after action of external DC electric field. The said process is a long-term one and is described by the logarithmic function of time. Reversible and nonreversible relaxation process takes place depending on the field intensity. The relaxation rate depends on the field strength also, and the said dependence has nonlinear and nonmonotonic form, if external field leads to domain disordering. The oxygen vacancies-based model for description of the long-term relaxation processes is suggested. The model takes into account the oxygen vacancies on the sample's surface ends, their conversion into F þ -and F 0 -centers under external effects and subsequent relaxation of these centers into the simple oxygen vacancies after the action termination. F-centers formation leads to the violation of the original sample's electroneutrality, and generate intrinsic DC electric field into the sample. Relaxation of F-centers is accompanied by the reduction of the electric field, induced by them, and relaxation of the dielectric constant, as consequent effect.

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Domain switching and creep behavior of a poled PZT wafer under through-thickness electric fields at high temperatures

Cited by 21 publications

References 14 publications

F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

Electro-Superplastic Solid State Welding of 40Cr/QCr0.5

F-centers mechanism of long-term relaxation in lead zirconate-titanate based piezoelectric ceramics. 2. After-field relaxation

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