Frequency-dependent electrical behaviour of Na 2 SiO 3 : a brief report
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Bull Mater Sci (2020)43:238 https://doi.org/10.1007/s12034-020-02184-6
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Frequency-dependent electrical behaviour of Na2SiO3: a brief report SUDHANGSHU CHAKRABORTY Department of BS and HU (Physics), Asansol Engineering College, Asansol 713305, India [email protected] MS received 20 November 2019; accepted 17 March 2020 Abstract. The present study reports the frequency-dependent electrical properties of sodium silicate (Na2SiO3) (SS) at different temperatures to understand the contribution of grain and grain boundary polarization to its electrical response at a lower frequency region. The low-frequency dielectric dispersion and non-Debye-type dielectric relaxation are attributed to polaron hopping that controls the complex impedance of SS. A single semi-circular arc in Nyquist plot indicates a dominance of grain boundary polarization in the relaxation mechanism. The analysis of frequencydependent ac conductivity in the studied temperature regime can be used to define the correlated barrier hopping model. Keywords.
1.
Sintering; complex impedance; grain polarization; ac conductivity; dielectric dispersion.
Introduction
The discovery of electroceramics opens the new window in the field of research due to their unique physical and electrical properties. These unique properties help to develop many key technologies for different industrial and research applications. The non-linear properties of ceramics, as reported by many researchers, are also very useful in industrial and research applications [1–5]. Among all the electroceramics, sodium silicate (Na2SiO3) (SS) is most important because of its unusual physical and chemical properties, such as high thermal stability, high mechanical strength, microstructure, etc. Na2SiO3 is also known as sodium meta-silicate or water glass. It is a colourless water soluble powder and can be prepared using different available methodologies, such as high-temperature solid-state reaction process, low-temperature sintering process, the sol–gel method and much more. For the present study SS has been prepared using the high-temperature sintering process. Some ions generate in very high-temperature sintering process and may modify the conducting behaviour of the host material [6]. According to the literature, the electrical conductivity in materials arises due to dielectric dispersion [7] and space charge polarization [8]. But it is important to observe the behaviour of SS under the ac field to understand the contribution of grain and grain boundary polarization in its electrical conductivity. The study of frequency-dependent electrical properties, such as complex impedance and ac conductivity of SS, is the novelty of this paper. The novelty of the present study includes the change of complex impedance with frequency and temperature, polarization effect in its electrical conductivity and
correlation of dielectric relaxation with complex impedance. Complex impedance spectroscopy (CIS) has been initiated to explain the contri
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