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European Journal of Mineralogy; July, August 2004; v. 16; no. 4; p. 671-675; DOI: 10.1127/0935-1221/2004/0016-0671
© 2004 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Magnetization and magnetic susceptibility of jadeite

Joanna A. BARTKOWSKA1, Jan CISOWSKI2,3, Jean VOIRON4, Jan HEIMANN5, Maria CZAJA6 and Zbigniew MAZURAK2

1 Department of Materials Science, Silesian University, ul. Sniezna 2, 41-200 Sosnowiec, Poland
2 Center of Polymer Chemistry, Polish Academy of Sciences, P.O. Box 20, 41-819 Zabrze, Poland
3 Institute of Physics, Cracow University of Technology, ul. Podchorazych 1, 30-084 Cracow, Poland
4 Laboratoire Louis Néel, B.P. 166, 38042 Grenoble Cedex 9, France
5 Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
6 Department of Earth Sciences, Silesian University, ul. Bedzinska 60, 41-200 Sosnowiec, Poland

Corresponding author, e-mail: asia{at}tech.us.edu.plw

We have studied the high-field magnetization (up to 14.5 T) and magnetic susceptibility in the temperature range 1.7 - 420 K of two samples of jadeite (NaAlSi2O6), white and green, containing transition metal ions and originating from Burma (now Myanmar). It appears that the high-temperature susceptibility data obey the Curie-Weiss law indicating the onset of the antiferromagnetic interaction between the magnetic ions. This interaction is also seen in the high-field magnetization data which are well described by the phenomenological cluster model. As a result of our analysis, we have identified the Fe3+ ions as the dominant ones in the studied jadeites and we have determined the molar concentration of these ions (0.8% in white- and 2.5% in green jadeite) as well as the diamagnetic susceptibility of the jadeite matrix (-3.8 x 10-7 emu/g).

Key-words: jadeite, magnetization, magnetic susceptibility, magnetic ion concentration.






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