Thermoelectric properties and stability characterization of doped-LaCrO3/Al2O3 composites for high-temperature thermocouples

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-04-12 DOI:10.1016/j.sna.2025.116569

Javier A. Mena, Katarzyna Sabolsky, Anthony A. Abrahamian, Konstantinos A. Sierros, Edward M. Sabolsky

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引用次数: 0

Abstract

Electroceramics-based thick film thermocouples were developed for accurate temperature monitoring in harsh environments, utilizing doped LaCrO₃ perovskite ceramics known for their chemical stability and thermoelectrical properties at high temperatures. LaCrO₃ (LC), La_1–xSr_xCrO₃ (LSCx), La_1–xCa_xCrO₃ (LCCx), and La_0.8Sr_0.2Cr_1-xMn_xO₃ (LSCMx) (0.1 ≤ x ≤ 0.3) compositions were investigated and printed on Al₂O₃ substrates. Thermoelectric characterization in air up to 900 °C revealed intrinsic Seebeck coefficients ranging from 150 μV/K to 380 μV/K for variable substitution levels of Sr, Ca, and Sr/Mn-doped lanthanum chromites. The fabricated thermocouples exhibited stable, linear, and reproducible temperature-dependent thermoelectric voltage responses. The most sensitive thermocouples were LC//LCC30 and LC//LSC30 showing effective Seebeck coefficients of 222.32 μV/K and 201.10 μV/K, respectively. Composites of LC and doped-LC with Al₂O₃ were synthesized to enhance sinterability and long-term stability. XRD and XPS analyses revealed low-level formation of secondary phases and new solid solutions due to high-temperature reactivity. Electrical conductivity decreased with Al₂O₃ content, and thermoelectrical voltage for LCC30–Al₂O₃//LC–Al₂O₃ couples exhibited good linear responses and high sensitivities, with effective Seebeck coefficients ranging from 230.34 μV/K to 255.21 μV/K for Al₂O₃ volume fractions between 10% and 30%, respectively. These experiments demonstrate the potential of "all-ceramic" thermocouples for monitoring temperature in extreme conditions as an alternative to precious metal thermocouples.

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...