Abstract
The spin resonance spectra of Cr3+ ions in triclinic kyanite Al2SiO5 can be interpreted with a spin Hamiltonian containing axial and rhombic terms. There are three magnetically inequivalent sites whose principal magnetic axes are nearly in the (100) crystal plane at angles of approximately -40°, +30°, +50° to the c axis. The measured parameters are g|| = 1.982 ± 0.0005, g⊥ = 1.977 ± 0.002 and |D| = 19.07, 20.85, 15.97 Gc/s; E = 0.54, 1.49, 1.04, Gc/s for the three ions. The inequivalent sites are correlated with the possible substitutional sites available in the crystal.
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