<p>The main objective of this research work is to investigate the structural, topological, dielectric, and electrical characteristics of powellite calcium molybdate with suitable application. The investigation of X-ray diffraction (XRD) pattern shows tetragonal symmetry having lattice parameters: a = b = 5.2257 Å, c = 11.4303 Å, cell volume: 312.14 (Å)<sup>3</sup> and centerosymmetric space group I41/a. The pair distribution function (PDF) spectrum reveals the atomic orientations of the tetragonal symmetry. The avg. crystallite size (244.66 nm) and micro-lattice strain (0.0017) are investigated using the Williamson-Hall plot. The exploration of well-defined grains, grain boundaries, purity, compactness, and topographic roughness (ISO25178) of CaMoO<sub>4</sub> has been confirmed by scanning electron microscope with energy dispersive X-ray (EDX) spectra. The relaxation phenomena, Maxwell–Wagner dielectric dispersion, and transport mechanisms are investigated by analyzing impedance, dielectric, and conduction spectra across a wide spectrum of frequencies and temperatures. This comprehensive approach allows for a thorough understanding of the electrical behavior of the sample. The scaling behavior of modulus spectra supports the non-Debye relaxation mechanism. The temperature-dependent resistance behavior confirms the prepared material can also be used for the NTC thermistor. The varistor constants β<sub>1</sub>, β<sub>2</sub>, and β<sub>3</sub> are 1.267, 2.046, and 11.609, signifying the occurrence of non-Ohmic mechanism, which is also appropriate for electronic devices.</p>

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Fabrication, Structural, Microstructural, Topological and Electrical Characteristics of Powellite Calcium Molybdate for Suitable Electronic Application

  • D. Panda,
  • S. S. Hota,
  • L. Biswal,
  • R. N. P. Choudhary

摘要

The main objective of this research work is to investigate the structural, topological, dielectric, and electrical characteristics of powellite calcium molybdate with suitable application. The investigation of X-ray diffraction (XRD) pattern shows tetragonal symmetry having lattice parameters: a = b = 5.2257 Å, c = 11.4303 Å, cell volume: 312.14 (Å)3 and centerosymmetric space group I41/a. The pair distribution function (PDF) spectrum reveals the atomic orientations of the tetragonal symmetry. The avg. crystallite size (244.66 nm) and micro-lattice strain (0.0017) are investigated using the Williamson-Hall plot. The exploration of well-defined grains, grain boundaries, purity, compactness, and topographic roughness (ISO25178) of CaMoO4 has been confirmed by scanning electron microscope with energy dispersive X-ray (EDX) spectra. The relaxation phenomena, Maxwell–Wagner dielectric dispersion, and transport mechanisms are investigated by analyzing impedance, dielectric, and conduction spectra across a wide spectrum of frequencies and temperatures. This comprehensive approach allows for a thorough understanding of the electrical behavior of the sample. The scaling behavior of modulus spectra supports the non-Debye relaxation mechanism. The temperature-dependent resistance behavior confirms the prepared material can also be used for the NTC thermistor. The varistor constants β1, β2, and β3 are 1.267, 2.046, and 11.609, signifying the occurrence of non-Ohmic mechanism, which is also appropriate for electronic devices.