Ahmed, M. A., and S. I. El-dek,
"Optimizing the physical characterizations of orthoferrites to be used as pressure and gamma sensor",
Materials Letters, vol. 60, no. 12, pp. 1437 - 1446, 2006.
AbstractThe magnetic and electrical properties of a series of orthoferrites: R0.7Ca0.3FeO3, R = La, Dy, Y, Er and Gd, were investigated from room temperature up to about 800 K. All samples were antiferromagnetic with a weak ferromagnetic component due to small canting of the Fe3+ moments. The correlation between magnetic transition and structural distortion is discussed on the basis of the variation of the Néel temperature as a function of the tolerance factor. The ac resistivity data at different frequencies from 100 kHz to 5 \{MHz\} is presented and discussed in view of structural characterization. The effect of γ-irradiation on both ac resistivity and magnetic susceptibility is investigated. Also, the influence of mechanical pressure on the dc resistivity was studied.