Space charge effect in ferroelectric (K0.50Na0.50)2Sr0.75Ba 0.75 Nb10O30 ceramics

Sangdon Bu; Dukhyun Chun; Gwangseo Park

doi:10.1143/jjap.36.4351

Space charge effect in ferroelectric (K_0.50Na_0.50)₂Sr_0.75Ba _0.75 Nb₁₀O₃₀ ceramics

Sangdon Bu^*
, Dukhyun Chun
, Gwangseo Park

^*Corresponding author for this work

Department of Physics

Sogang University

Research output: Contribution to journal › Journal article › peer-review

5 Scopus citations

Abstract

The effects of space charges on the ferroelectric properties of (K_0.50Na0.50)₂(Sr_0.75Ba_0.25) ₄Nb₁₀O₃₀ (KNSBN) ceramics have been investigated in the temperature range between 3O°C and 800°C. For samples aged at room temperature or poled at temperatures above the Curie point (T_c ∼ 208°C) in order to induce space-charge polarization, we have observed a broad dielectric peak at around 650°C, a negative depolarization current above 650°C, and a variation of the activation energy at 650°C. This behavior above T_c may be interpreted in terms of mobile space charges such as A-site vacancies or oxygen vacancies which may be formed during the sintering process at high temperatures (∼1300°C), The experimental results are discussed in connection with the interaction between the polarities of domain and space charges.

Original language	English
Pages (from-to)	4351-4354
Number of pages	4
Journal	Japanese Journal of Applied Physics
Volume	36
Issue number	7 A
DOIs	https://doi.org/10.1143/jjap.36.4351
State	Published - 1997.07

Keywords

(KNa0.50)(SrBa) NbO
Activation energy
Aging
Dielectric constant
Space charge
Thermal depolarization current

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10.1143/jjap.36.4351

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title = "Space charge effect in ferroelectric (K0.50Na0.50)2Sr0.75Ba 0.75 Nb10O30 ceramics",

abstract = "The effects of space charges on the ferroelectric properties of (K0.50Na0.50)2(Sr0.75Ba0.25) 4Nb10O30 (KNSBN) ceramics have been investigated in the temperature range between 3O°C and 800°C. For samples aged at room temperature or poled at temperatures above the Curie point (Tc ∼ 208°C) in order to induce space-charge polarization, we have observed a broad dielectric peak at around 650°C, a negative depolarization current above 650°C, and a variation of the activation energy at 650°C. This behavior above Tc may be interpreted in terms of mobile space charges such as A-site vacancies or oxygen vacancies which may be formed during the sintering process at high temperatures (∼1300°C), The experimental results are discussed in connection with the interaction between the polarities of domain and space charges.",

keywords = "(KNa0.50)(SrBa) NbO, Activation energy, Aging, Dielectric constant, Space charge, Thermal depolarization current",

author = "Sangdon Bu and Dukhyun Chun and Gwangseo Park",

year = "1997",

month = jul,

doi = "10.1143/jjap.36.4351",

language = "English",

volume = "36",

pages = "4351--4354",

journal = "Japanese Journal of Applied Physics",

issn = "0021-4922",

number = "7 A",

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TY - JOUR

T1 - Space charge effect in ferroelectric (K0.50Na0.50)2Sr0.75Ba 0.75 Nb10O30 ceramics

AU - Bu, Sangdon

AU - Chun, Dukhyun

AU - Park, Gwangseo

PY - 1997/7

Y1 - 1997/7

N2 - The effects of space charges on the ferroelectric properties of (K0.50Na0.50)2(Sr0.75Ba0.25) 4Nb10O30 (KNSBN) ceramics have been investigated in the temperature range between 3O°C and 800°C. For samples aged at room temperature or poled at temperatures above the Curie point (Tc ∼ 208°C) in order to induce space-charge polarization, we have observed a broad dielectric peak at around 650°C, a negative depolarization current above 650°C, and a variation of the activation energy at 650°C. This behavior above Tc may be interpreted in terms of mobile space charges such as A-site vacancies or oxygen vacancies which may be formed during the sintering process at high temperatures (∼1300°C), The experimental results are discussed in connection with the interaction between the polarities of domain and space charges.

AB - The effects of space charges on the ferroelectric properties of (K0.50Na0.50)2(Sr0.75Ba0.25) 4Nb10O30 (KNSBN) ceramics have been investigated in the temperature range between 3O°C and 800°C. For samples aged at room temperature or poled at temperatures above the Curie point (Tc ∼ 208°C) in order to induce space-charge polarization, we have observed a broad dielectric peak at around 650°C, a negative depolarization current above 650°C, and a variation of the activation energy at 650°C. This behavior above Tc may be interpreted in terms of mobile space charges such as A-site vacancies or oxygen vacancies which may be formed during the sintering process at high temperatures (∼1300°C), The experimental results are discussed in connection with the interaction between the polarities of domain and space charges.

KW - (KNa0.50)(SrBa) NbO

KW - Activation energy

KW - Aging

KW - Dielectric constant

KW - Space charge

KW - Thermal depolarization current

UR - https://www.scopus.com/pages/publications/0031192972

U2 - 10.1143/jjap.36.4351

DO - 10.1143/jjap.36.4351

M3 - Journal article

AN - SCOPUS:0031192972

SN - 0021-4922

VL - 36

SP - 4351

EP - 4354

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - 7 A

ER -

Space charge effect in ferroelectric (K_0.50Na_0.50)₂Sr_0.75Ba _0.75 Nb₁₀O₃₀ ceramics

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Keywords

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