Effects of cation siting and spin–spin interactions on the electron paramagnetic resonance (EPR) of Cu2+ exchanged X Faujasite zeolite

2006 ◽  
Vol 330 (3) ◽  
pp. 401-409 ◽  
Author(s):  
Chrispin O. Kowenje ◽  
Barry R. Jones ◽  
David C. Doetschman ◽  
Szu-Wei Yang ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic ◽  
Faujasite Zeolite

Effects of Possible Spin-Spin Interactions on EPR spectra of Cu2+ exchanged Faujasite–X (I)

2005 ◽  
Vol 900 ◽  
Author(s):  
Chrispin B. O. Kowenje ◽  
Barry R. Jones ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Continuous Wave ◽  
Recent Literature ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic

ABSTRACTThe interpretation of the continuous wave electron paramagnetic resonance (CW-EPR) spectra of Cu2+ exchanged in Faujasite zeolite is not straightforward. Recent literature points to the role of both Cu2+ zeolite sites and Cu2+ relationship to lattice Al in determining the parameters of Cu2+ spin Hamiltonian. Our work shows that at low concentration, Cu2+ EPR signals show negligible spin-spin interactions. At higher Cu (II) concentrations, a third CW-EPR spectrum that has contributions from both the CW-EPR and the spin-spin interactions, appears.

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