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Enhanced thermistor performance and multi-mechanism charge transport in NTC La0.8Sr0.2Mn0.95Cu0.05O3 Ceramic for possible high-temperature sensing applications
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DOI：10.1016/j.ceramint.2026.08.122.png)
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Abstract
En 中文
La0.8Sr0.2Mn0.95Cu0.05O3 thermo-sensitive ceramic was successfully synthesized by the conventional solid-state reaction method and evaluated as a promising negative temperature coefficient (NTC) thermistor material for high-temperature applications. X-ray diffraction analysis confirmed the formation of a rhombohedral perovskite structure with the R c space group. Microstructural analysis demonstrated good crystallinity, with crystallite size and lattice microstrain consistently estimated using the Debye–Scherrer, Williamson–Hall, and Halder–Wagner approaches. Temperature-dependent electrical conductivity (300–700 K) revealed three successive thermally activated conduction mechanisms, namely Mott variable-range hopping (T < 430 K), Shklovskii–Efros variable-range hopping (430–550 K), and adiabatic small-polaron hopping (T > 550 K), indicating a progressive evolution of the charge-transport process with temperature. The material exhibited excellent NTC thermistor characteristics, with a thermistor constant β = (5.82 ± 0.20) × 103 K, a temperature coefficient of resistance ranging from −6.5 to −1 % K-1, an activation energy of 0.501 ± 0.017 eV, and a stability factor of 2.85. These values demonstrate high thermal sensitivity and good operational stability, comparable to or exceeding those of many commercial oxide-based NTC thermistors. Analysis of the AC conductivity using Jonscher’s universal power law further revealed the coexistence of hopping and tunneling transport mechanisms, supporting the DC conduction analysis. The combination of high β value, large negative TCR, wide operating temperature range, and reliable stability demonstrates that La0.8Sr0.2Mn0.95Cu0.05O3 is a strong candidate for high-temperature NTC thermistors used in temperature sensing, industrial monitoring, automotive electronics, and circuit protection.
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