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<p>The development of high-performance solid-state ionic conductors requires structurally stable and lithium-rich oxide materials with efficient Li⁺ transport characteristics. In this context, the present study aims to synthesize and evaluate the structural, microstructural, and relaxation properties of nanocrystalline Li₂NiZrO₄ for potential solid-state electroceramic applications. Lithium-rich Li₂NiZrO₄ was prepared via a glycine-assisted solution combustion route using a stoichiometric (1:1) oxidizer–fuel ratio, enabling the formation of a phase-pure nanocrystalline compound. Structural analysis using X-ray diffraction confirmed a single-phase cubic lattice with an average crystallite size of ~ 51&#xa0;nm, while TG–DTA verified its thermal stability. SEM imaging revealed a uniform surface morphology, and EDS confirmed the expected elemental composition. TEM and HRTEM further validated the nanocrystalline nature, showing monodisperse domains with an average size of 47.9 ± 0.02&#xa0;nm. Impedance spectroscopy was employed to probe relaxation dynamics over a wide temperature range. The frequency-dependent electric modulus, M″(ω), exhibited well-defined relaxation peaks, and the corresponding relaxation time (τ = 1/ωₚ) followed Arrhenius behaviour with an activation energy of 0.39 ± 0.02&#xa0;eV, indicating facile Li⁺ ion migration or dipolar reorientation. The temperature-invariant scaling of modulus spectra suggests a common relaxation mechanism governing charge transport. Overall, the study demonstrates that nanocrystalline Li₂NiZrO₄ possesses favourable structural stability, nanoscale coherence, and low activation energy for ionic motion. These attributes underline its promise as a solid-state ionic conductor suitable for advanced energy storage and electroceramic applications.</p>

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Ion dynamics and structure of Lithium-Rich nanocrystalline Li₂NiZrO₄

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Manohar P,
  • Rajesh Cheruku,
  • M.V.H. Rao,
  • Amar Srivastava,
  • P. Aruna,
  • C. M. Joseph,
  • D. Surya Bhaskaram,
  • Lakshmi Vijayan

摘要

The development of high-performance solid-state ionic conductors requires structurally stable and lithium-rich oxide materials with efficient Li⁺ transport characteristics. In this context, the present study aims to synthesize and evaluate the structural, microstructural, and relaxation properties of nanocrystalline Li₂NiZrO₄ for potential solid-state electroceramic applications. Lithium-rich Li₂NiZrO₄ was prepared via a glycine-assisted solution combustion route using a stoichiometric (1:1) oxidizer–fuel ratio, enabling the formation of a phase-pure nanocrystalline compound. Structural analysis using X-ray diffraction confirmed a single-phase cubic lattice with an average crystallite size of ~ 51 nm, while TG–DTA verified its thermal stability. SEM imaging revealed a uniform surface morphology, and EDS confirmed the expected elemental composition. TEM and HRTEM further validated the nanocrystalline nature, showing monodisperse domains with an average size of 47.9 ± 0.02 nm. Impedance spectroscopy was employed to probe relaxation dynamics over a wide temperature range. The frequency-dependent electric modulus, M″(ω), exhibited well-defined relaxation peaks, and the corresponding relaxation time (τ = 1/ωₚ) followed Arrhenius behaviour with an activation energy of 0.39 ± 0.02 eV, indicating facile Li⁺ ion migration or dipolar reorientation. The temperature-invariant scaling of modulus spectra suggests a common relaxation mechanism governing charge transport. Overall, the study demonstrates that nanocrystalline Li₂NiZrO₄ possesses favourable structural stability, nanoscale coherence, and low activation energy for ionic motion. These attributes underline its promise as a solid-state ionic conductor suitable for advanced energy storage and electroceramic applications.