Electron paramagnetic resonance of Cr³⁺ ions in ferroelastic CsLiSO₄

Abstract

The X-band EPR studies of Cr³⁺-doped LCS have been performed. The values of the spin-Hamiltonian parameters for Cr³⁺ ions have been estimated at room temperature. The effect of crystal twinning on the EPR spectra has also been described. The temperature behaviour of EPR lines originated from two structurally different chromium complexes has been studied close to the ferroelastic phase transition. From the temperature dependence of positions of the split resonance lines a value of the critical exponent β of the order parameter was found to be β = 0.25.

Keywords:

• electron paramagnetic resonance
• phase transition
• ferroelastics
• growth twins
• double sulphates