Comparative study of 2mol% Li- and Mn-substituted lead-free potassium sodium niobate ceramics

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• 作者：Asha Dahiya (1)
  O. P. Thakur (1)
  J. K. Juneja (2)
  Sangeeta Singh (3)
  Dipti (3) (4)
  
• 关键词：ceramics ; dielectric properties ; ferroelectricity ; piezoelectricity ; substitution ; comparative study
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：21
• 期：12
• 页码：1241-1246
• 全文大小：993 KB
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• 作者单位：Asha Dahiya (1)
  O. P. Thakur (1)
  J. K. Juneja (2)
  Sangeeta Singh (3)
  Dipti (3) (4)
  
  1. School of Applied Sciences, Netaji Subhas Institute of Technology, Dwarka University of Delhi, New Delhi, 110078, India
  2. Department of Physics, Hindu College, Sonepat, 131001, India
  3. Department of Physics, Geeta Vidya Mandir Girls College, Sonepat, 131001, India
  4. School of Physics & Material Sciences, Thapar University, Patiala, 147004, India
  
• ISSN：1869-103X

文摘

The effect of Li and Mn substitution on the dielectric, ferroelectric and piezoelectric properties of lead free K0.5Na0.5NbO3 (KNN) was investigated. Samples were prepared using a conventional solid state reaction method. The sintering temperature for all the samples was 1050°C. The optimum doping concentration for the enhancement of different properties without the introduction of any other co-dopants such as Ti, Sb, and La was investigated. X-ray diffraction analysis confirmed that all the samples crystallize in a single phase perovskite structure. The dielectric properties were investigated as a function of temperature and applied electric field frequency. Compared with Li-substituted KNN (KLNN), Mn-substituted KNN (KMNN) exhibited a higher dielectric constant ? max (i.e., 4840) at its critical transition temperature T c (i.e., 421°C) along with a lower value of tangent loss at 10 kHz and greater values of saturation polarisation P s (i.e., 20.14 μC/cm2) and remnant polarisation P r (i.e., 15.48 μC/cm2). The piezoelectric constant (d 33) of KMNN was 178 pC/N, which is comparable to that of lead-based hard ceramics. The results presented herein suggest that B-site or Mn substitution at the optimum concentration results in good enhancement of different properties required for materials used in memory devices and other applications.