Site Occupancy and Dielectric Characteristics of Strontium Barium Niobate Ceramics: Sr/Ba Ratio Dependence

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概要

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• The tetragonal tungsten bronze type of SrxBa1-xNb2O6 (SBN, $0.3\leq x\leq 0.7$) ceramics was synthesized using the solid state reaction method and the dielectric properties of SBN ceramics as a function of the Sr/Ba ratio were examined. With an increasing Sr/Ba ratio in SBN ceramics, the Curie temperature decreases while the maximum dielectric constant at the Curie temperature increases. The relaxor behavior of the SBN ceramics as a function of the Sr/Ba ratio was quantitatively evaluated. The relaxor behavior of the dielectric constant became stronger as the ratio of Sr/Ba increased. In the composition where $x=0.4$, the degree of diffuse phase transition (DPT) was lowest because Sr and Ba ions exist only in the A1 and A2 sites, respectively, different from other composition. Various situations in which the Sr and Ba cations occupy the A1 and A2 sites were considered as a function of the Sr/Ba ratio. A relationship between DPT behavior and ion ordering at A1 and A2 was analyzed theoretically as a function of the Sr/Ba ratio. The experimental results are explained from the viewpoint of tungsten bronze crystallography of SBN ceramics.

• INSTITUTE OF PURE AND APPLIED PHYSICSの論文
• 2002-11-30

著者

• Kim Myoung-sup

  Department Of Inorganic Materials Engineering Kyungpook National University

• Wang Peng

  Department Of Clinical Laboratories Peking Union Medical College Hospital Chinese Academy Of Medical

• LEE Joon-Hyung

  Department of Inorganic Materials Engineering, Kynngpook National University

• Cho Sang-hee

  Department Of Hematology/oncology Chonnam National University Hwasun Hospital

• Lee Hee

  Department Of Anesthesiology And Pain Medicine Hanyang University College Of Medicine

• Kim Jeong-Joo

  Department of Electronic Materials Science and Engineering, Kyungpook National University, Daegu 702-701, Korea

• Kim Jeong-Joo

  Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Korea

• Lee Joon-Hyung

  Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Korea

• Kim Myoung-Sup

  Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Korea

• Cho Sang-Hee

  Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Korea

• WANG Peng

  Department of Bioengineering, Nanjing University of Science and Technology

• Wang Peng

  Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Korea

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