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2019 Vol.29, Issue 8 Preview Page
Dielectric and Electrical Characteristics of Lead-Free Complex Electronic Material: Ba0.8Ca0.2(Ti0.8Zr0.1Ce0.1)O3
Manisha Sahu1
,
Sugato Hajra1†
,
Ram Naresh Prasad Choudhary2
1Department of Electronics and Instrumentation
2Department of Physics, Siksha ‘O’ Anusandhan University, Bhubaneswar-751030, India
†Corresponding author E-Mail : manishafl@outlook.com (M. Sahu, Siksha ‘O’ Anusandhan Univ.)
August 2019. pp. 469-476
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Abstract

A lead-free bulk ceramic having a chemical formula Ba0.8Ca0.2(Ti0.8Zr0.1Ce0.1)O3 (further termed as BCTZCO) is synthesized using mixed oxide route. The structural, dielectric, impedance, and conductivity properties, as well as the modulus of the synthesized sample are discussed in the present work. Analysis of X-ray diffraction data obtained at room temperature reveals the existence of some impurity phases. The natural surface morphology shows close packing of grains with few voids. Attempts have been made to study the (a) effect of microstructures containing grains, grain boundaries, and electrodes on impedance and capacitive characteristics, (b) relationship between properties and crystal structure, and (c) nature of the relaxation mechanism of the prepared samples. The relationship between the structure and physical properties is established. The frequency and temperature dependence of the dielectric properties reveal that this complex system has a high dielectric constant and low tangent loss. An analysis of impedance and related parameters illuminates the contributions of grains. The activation energy is determined for only the high temperature region in the temperature dependent AC conductivity graph. Deviation from the Debye behavior is seen in the Nyquist plot at different temperatures. The relaxation mechanism and the electrical transport properties in the sample are investigated with the help of various spectroscopic (i.e., dielectric, modulus, and impedance) techniques. This lead free sample will serve as a base for device engineering.

Keywords
solid state reaction
dielectric
conductivity
modulus
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :8
  • Pages :469-476
  • Received Date : 2019-04-14
  • Revised Date : 2019-05-21
  • Accepted Date : 2019-08-06
  • DOI :https://doi.org/10.3740/MRSK.2019.29.8.469
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