1. Ito, K. and Nakazawa, T., J. Appl. Phys., 1988, vol. 27, p. 2094.
2. Maeda, T., Nakamura, S., and Wada, T., Mater. Res. Soc. Symp. Proc., 2009, p. 1165.
3. Hall, S.R., Szymanski, J.T., and Stewart, J.M., Can. Mineral., 1978, vol. 16, p. 131.
4. Lide, D.R., Handbook of Chemistry and Physics, Cleveland, Ohio: CRC, 1998.
5. Bernardini, G.P., Borrini, D., Caneschi, A., Benedetto, F.D., Gatteschi, D., Ristori, S., and Romanelli, M., Phys. Chem. Miner., 2000, vol. 27, p. 453.