Measurement of the Curie temperature based on temperature dependent thermal properties. (May 2021)

• Record Type: Journal Article
• Authors: Wilhelmy, S.; Zimare, A.; Zhang, Q.; Rettenmayr, M.; Lippmann, S.
• Is Part Of: International communications in heat and mass transfer. Volume 124(2021)
• Publication Date: 2021-05
• Subjects: Curie temperature -- Thermal diffusivity -- Thermal conductivity -- Ni -- High resolution temperature measurement -- Temperature dependence; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Heat -- Transmission; Mass transfer; Periodicals; 621.4022
• DOI: 10.1016/j.icheatmasstransfer.2021.105239
• Languages: English
• ISSNs: 0735-1933

Abstract

Abstract: A temperature gradient evaluation method for swift determination of the Curie temperature T C based on thermal conductivity and thermal diffusivity as functions of temperature is presented. In an imposed one-dimensional temperature gradient, temperature profiles along the axis of a cylindrical sample are recorded in steady-state and transient states using a photon detector. Transient temperature profiles are evaluated by an inverse numerical method, yielding the temperature dependent thermal diffusivity with a distinct change in slope at T C . The slope of the steady-state temperature profile adjusts according to the local thermal conductivity and changes abruptly at T C . The high-resolution determination of the temperature dependent thermal properties allows the identification of T C by two independent evaluations during a single experimental run, solely relying on data of thermal conductivity and thermal diffusivity. The obtained T C excellently agrees with literature values gained by conventional methods. Graphical abstract: Unlabelled Image Highlights: General method for determining temperature dependent thermal properties. Determination of temperature dependence in a single experimental run only. Prior knowledge of the functional form of temperature dependence not required. Time efficient experimental and evaluation procedures. High resolution for simultaneous determination of Curie temperature TC.