Electron paramagentic resonance and phase transitions in Mn2+ doped Cd(ClO4)2⋅6H2O

Abstract

An electron paramagnetic resonance study of Mn²⁺ doped in Cd(ClO₄)₂⋅6H₂O has been made from 328 K to liquid nitrogen temperature. The site symmetry of Cd²⁺ is trigonal with a water octahedron distorted parallel to the crystallographic c axis. Mn²⁺ substitutes for Cd²⁺ and exhibits a characteristic 30‐line hyperfine spectrum at room temperature (298 K) for the magnetic field H along the c axis. The D parameter is small and therefore there is considerable overlapping of lines in the spectrum. The spectrum is axially symmetric. On lowering the temperature, phase transitions are found to occur at 272±1 and 115.5±1 K.