Investigations of the EPR parameters and the local structures for V²⁺, Ni²⁺ and Mn²⁺ ions in CsMgCl₃ crystal

Abstract

The EPR parameters (D, g _‖ and g _⊥) for V²⁺, Ni²⁺ and Mn²⁺ ions in linear-chain lattice CsMgCl₃ at 77 K have been studied from the crystal-field theory. From these studies, one can find that the local lattice relaxation occurs in the vicinity of these paramagnetic impurity ions. The bonding angles β of MCl^4- ₆ groups in the cases of V²⁺ and Ni²⁺ ions are determined quantitatively from EPR data and in the case of Mn²⁺ ion, it is estimated qualitatively. These results support the opinion that the [MX⁻ ₃]_n chains in one-dimensional AMX₃, lattice are easily deformed to accommodate impurity ions.

Key Words:

• electron paramagnetic resonance
• crystal-field theory
• local lattice relaxation
• V²⁺
• Ni²⁺
• Mn²⁺
• CsMgCl₃