Deepapriya, S.Rodney, J.D.Udayashankar, N.K.2026-02-042023Journal of Materials Science: Materials in Electronics, 2023, 34, 26, pp. -9574522https://doi.org/10.1007/s10854-023-11201-3https://idr.nitk.ac.in/handle/123456789/21733The necessity for materials designed with high and low-K dielectric constant having unique thermal stability has been a prime factor for the continuous development of the microelectronics-based industries. To address this issue, pure and 1% lanthanum (La) substituted copper oxide (CuO) nanoparticles were synthesized through an eco-friendly and time effective co-precipitation route for new unanticipated facts. The thermal effisivity of the material was determined by means of photoacoustic spectroscopy (PAS). The dielectric analysis of the monoclinic structured pure and La doped CuO nanoparticles in the frequency range of 1 Hz–1 MHz for various temperatures was noted, Dielectric constant and loss factor had a declining trend with surge in applied frequency and turned out to be independent of frequency at higher frequencies. The AC conductivity observed has confirmed the semi-conducting nature of the nanoparticle and obeyed Jonscher’s universal law. The temperature-dependant electric relaxation process was revealed using complex impedance spectroscopic studies suggesting non-Debye type behaviour of the material. The electrical activity of the nanoparticles is established for the circuit model devised from the calculated relaxation time constant. The impact of the thermal property and the hopping mechanism in the material with indices of interest is confirmed from the electric modulus. The obtained impedance spectra indicate the effect of lanthanum on the grain boundaries and the higher basicity and electropositive nature of lanthanum on the dielectric relaxation process. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.Copper oxidesDielectric relaxationGrain boundariesLanthanum compoundsLow-k dielectricMicroelectronicsPrecipitation (chemical)Spectroscopic analysisStress relaxationSynthesis (chemical)Co-precipitationContinuous developmentDielectric analysisEco-friendlyK dielectricsLanthana dopedMonoclinicsPrime factorsSynthesisedThermalNanoparticles