Abstract
The EPR of Mn(II) doped in single crystals of diamagnetic ZnNbOF 5 · 6H 2O and paramagnetic CoNbOF 5 · 6H 2O is studied at different temperatures. Observation of sharp resonance of Mn(Il) at 300 K and broadening of the resonance lines beyond detection below 120 K in the paramagnetic host is interpreted in terms of the random modulation of the dipolar interaction between Mn 2+ and Coil ions by the fast spin-lattice relaxation of Co 2+ ions. An estimate of the spin-lattice relaxation rate of the Co 2+ ions is made by measuring the linewidth of the dopant Mn(II). The temperature dependence of the EPR parameters of Mn(Il) in CoNbOF 5 · 6H 2O further indicates a structural phase transition at 238 K. The reduction in symmetry in the low-temperature phase as revealed by the site splitting and spin-Hamiltonian parameters is in accordance with the structural aspects of a well studied phase transition in the isomorphous lattice CoSiF 6 · 6H 2O.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
