An Isothermal Peltier Cell Calorimeter For Measuring the Magnetocaloric Effect

Author

Kuepferling, Michaela ; Sasso, Carlo Paolo ; Basso, Vittorio ; Giudici, Laura

Author_Institution

Ist. Nazionale di Ricerca Metrologica, Torino

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2764

Lastpage

2766

Abstract

We have developed a method for isothermal calorimetry for the determination of the entropy change in magnetic materials. Heat absorbed and released by the sample at constant temperature is measured by means of Peltier cells, used in an active way to simultaneously measure the heat current and keep constant the sample temperature. In the paper we describe the method, the Peltier cell calibration and the test apparatus. The results obtained on a Gadolinium sample at room temperature under a magnetic field up to 0.9 T are discussed. The comparison with other methods demonstrates the validity of the proposed approach to fulfil the isothermal conditions (DeltaTles5 mK) and to obtain a faster time response

Keywords

Peltier effect; calorimetry; entropy; gadolinium; magnetic variables measurement; magnetocaloric effects; 0.9 T; Gd; Peltier cell; entropy; gadolinium; isothermal calorimetry; magnetic materials; magnetocaloric effect; Calibration; Calorimetry; Current measurement; Entropy; Isothermal processes; Magnetic field measurement; Magnetic materials; Temperature measurement; Testing; Time factors; Calorimetry; gadolinium; magnetocaloric; thermoelectric;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893862

Filename

4202815