Abstract
An EPR study of Cu2+ ions in chabazite single crystals has revealed that the copper is presented in three magnetically inequivalent sites. Copper ions at two of these sites differ only in symmetry axes which are 7° apart. This is believed to be a result of twinning or strain in the crystals. These ions are characterized by g∥ = 2.324, g⊥ = 2.068, A∥ = 0.0159 cm−1, A⊥ = 0.0018 cm−1 and Q = 0.0009 cm−1. They are thought to be in the site 2 position, which is located near the center of the six-membered rings. The symmetry axis of the ions essentially coincides with the symmetry axis of the crystal. Copper ions in the third type of site are less abundant and are in a more isotropic environment which suggests that they are located at the site 1 position in the center of the distorted hexagonal prisms.
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