Ferri-para-magnetism of tungsten and its carbide cermets for elevated temperature sensor application
Autor: | Swe-Kai Chen, Yeu-Tiing Tsai, Bo-Wen Jou |
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Rok vydání: | 2018 |
Předmět: |
Materials science
Condensed matter physics Magnetism General Physics and Astronomy 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility 010305 fluids & plasmas Carbide Paramagnetism Ferrimagnetism 0103 physical sciences Melting point Diamagnetism 0210 nano-technology |
Zdroj: | Chinese Journal of Physics. 56:303-307 |
ISSN: | 0577-9073 |
DOI: | 10.1016/j.cjph.2017.12.011 |
Popis: | In routinely analyzing experimental results of low-temperature, 5 K ≤ T ≤ 300 K, magnetic susceptibility χ(T) of fused tungsten and its fused carbide cermets, hereafter called “the materials”, by assuming the susceptibility satisfying the Neel ferrimagnetic formula, χ−1 = χ0−1 + χ1−1 + χ2−1, where χ0−1, χ1−1, and χ2−1 are respectively the inverses of the Pauli paramagnetic, χ0 > 0, a Curie diamagnetic, χ1 = C/T 300 K) temperatures, one finds two singular points in the susceptibility inverse curve χ−1. One is at Θp > 0, e.g., Θp = −1.73 K, and Θa = −C/χ0 = +8655 K for tungsten. In view of their susceptibility precisely satisfying the Neel ferrimagnetic formula in the temperature range of 5 K and 300 K, they are called “ferri-para-magnetism” and are good for elevated temperature sensor application if the temperature extension is satisfied. As temperature exceeding an asymptotic temperature, Θa, the paramagnetic state turns to a diamagnetic state, suggesting that there might be a superconducting transition at this temperature for some of the materials with Θas that are lower than their melting points, e.g., Θa(C7M1) = +2735 K and Θa(-VC) = +2242 K. |
Databáze: | OpenAIRE |
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