Space Charge Effect in Ferroelectric (K 0.50Na 0.50) 2(Sr 0.75Ba 0.25) 4Nb 10O 30 Ceramics

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概要

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• 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 30°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.

• Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
• 1997-07-15

著者

• Park G

  Kookmin Univ. Seoul Kor

• Park Gwangseo

  Department Of Physics Sogang University

• Bu Sangdon

  Department of Physics, Sogang University, C.P.O. Box 1142, Seoul, Korea

• Chun Dukhyun

  Department of Physics, Sogang University, C.P.O. Box 1142, Seoul, Korea

• Bu Sangdon

  Department Of Physics Sogang University

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• High T_c Superconducting Film Formation at the Bi-Pb-O / Sr-Ca-Cu-O Interface
• Frequency-Locked Submillimeter Wave Generation from Josephson Junction Arrays
• Patterned Bi-Sr-Ca-Co-O Films on Sr_2Ca_2Cu_4O_y Substrates by Surface Diffusion of Metallic Bismuth
• Raman Spectra Study of K0.5Na0.5NbO3 Ferroelectric Thin Films
• Space Charge Effect in Ferroelectric (K 0.50Na 0.50) 2(Sr 0.75Ba 0.25) 4Nb 10O 30 Ceramics

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