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Title: The abnormal electrical and optical properties in Na and Ni codoped BiFeO{sub 3} nanoparticles

Bi{sub 0.97}Na{sub 0.03}Fe{sub 1−x}Ni{sub x}O{sub 3} (x = 0, 0.005, 0.01, 0.015) nanoparticles are prepared via a sol-gel method. Weak ferromagnetism and exchange bias phenomenon without field cooling are observed in the samples. The oxygen vacancy concentration and leakage current density are increased with increasing the Ni content. However, with the increase of Ni content, the band gap of Bi{sub 0.97}Na{sub 0.03}Fe{sub 1−x}Ni{sub x}O{sub 3} nanoparticles first decreases and then increases. To explain the abnormal phenomenon, the interplay of oxygen vacancy donor and hole acceptor is analyzed and a phenomenological qualitative model based on the electronic energy band is proposed. Additionally, the threshold switching behavior appears in Bi{sub 0.97}Na{sub 0.03}Fe{sub 1−x}Ni{sub x}O{sub 3} samples with x = 0.01, 0.015 and the effect is qualitatively explained by introducing a conducting channel model based on the high-density mobile charges.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin University, Tianjin 300072 (China)
  2. College of Physics and Materials Science, Tianjin Normal University, Tianjin 300074 (China)
  3. (Hong Kong)
  4. Department of Physics, The University of Hong Kong, Pokfulam Road (Hong Kong)
  5. Department of Information Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi (China)
Publication Date:
OSTI Identifier:
22402989
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; BISMUTH COMPOUNDS; CONCENTRATION RATIO; ELECTRONIC STRUCTURE; ENERGY GAP; FERROMAGNETISM; HOLES; IRON OXIDES; LEAKAGE CURRENT; NANOPARTICLES; NICKEL COMPOUNDS; OPTICAL PROPERTIES; OXYGEN; SODIUM COMPOUNDS; SOL-GEL PROCESS; VACANCIES