Experimental Study of Magnetic Properties of Alumina Ceramics |
| R. Tarasenko, A. Orendáčová, M. Orendáč, M. Kajňaková and A. Feher
Centre of Low Temperature Physics of SAS and P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovak Republic |
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| Magnetic properties of alumina ceramics were studied within a program focused at design of microcalorimeters and experimental setup for specific heat and magnetocaloric measurements. The investigations were concentrated on the determination of amount of magnetic impurities that can significantly influence results of physical measurements at low temperatures. Our experimental studies of heat capacity, susceptibility and magnetization clearly indicate that alumina ceramics contains magnetic impurities, primarily ions with spin 5/2. The average concentration of magnetic ions was estimated, n ≈ 2000 ppm. More details of analysis of experimental data are discussed in the paper. |
| DOI: 10.12693/APhysPolA.118.1067 PACS numbers: 75.20.-g, 75.60.Ej, 75.40.-s |