Exploring the characteristics of CoMnP2O7 diphosphate: a comprehensive analysis of structure, morphology, optics, dielectrics, and electrical properties

The polycrystalline powder of CoMnP2O7 has been prepared via the conventional solid-state reaction route. The X-ray diffraction analysis revealed the formation of a single-phase monoclinic lattice system. The atomic positions as well as the characteristic interatomic distances and angles have been deduced through the Rietveld refinement. The SEM images indicate the polycrystalline nature of the material with grain size anisotropy. The CoMnP2O7 is identified as a wide direct band-gap material, further highlighting its potential use across a range of industries, including electronic and optical device manufacturing. Dielectric measurements have been performed in the temperature range of 298-800 K at different frequencies, and versus frequency under various temperatures. This material demonstrates promising characteristics for potential capacitor applications, as evidenced by its high dielectric constant and low losses. The CoMnP2O7 pyrophosphate presents high permittivity at low frequencies owing to Maxwell-Wagner polarization arising from the inter-grain boundaries, as confirmed through impedance spectroscopy. An equivalent circuit has been provided to model the electrical response. The ac-conductivity increases as the temperature increases, and oxygen vacancies dominate at high temperatures. The obtained results also suggest the possibility of using this material for capacitors as well as both NTC and PTC thermistors.

Automated summary

The polycrystalline powder of CoMnP2O7 was prepared using the solid-state reaction method, and the X-ray diffraction analysis showed the formation of a single-phase monoclinic lattice system. The material exhibited polycrystalline nature with grain size anisotropy according to the SEM images. CoMnP2O7 was identified as a wide direct band-gap material, making it potentially useful in electronic and optical device manufacturing. Dielectric measurements revealed its high dielectric constant and low losses, indicating its suitability for capacitor applications. It also displayed promising characteristics for both NTC and PTC thermistors.