Summary
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1.
A forsterite ceramic with copper introduced from solution contains two types of Cu2+. One of these gives a broad nearly isotropic line with geff=2.18, which is due to Cu2+ in a tetragonally deformed octahedron of oxygen ions. The Jahn-Teller effect, which is responsible for this deformation, is averaged by reorientation of the tetragonal axis. The second type is seen only at low temperatures and has a resolved HS; it is due to Cu2+ in an analogous environment, but with the reorientation frozen-in.
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2.
The relation between the two types of center is the same throughout the volume of the specimen.
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3.
Cu2+ enters the vitreous phase on firing at 1000 ° C.
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4.
Ordering of the local symmetry of the environment of the copper occurs as the firing temperature is raised.
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Zamotrinskaya, E.A., Brysnev, E.K. & Shaulev, A.S. ESR of copper in a forsterite ceramic. Soviet Physics Journal 10, 6–9 (1967). https://doi.org/10.1007/BF01649464
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DOI: https://doi.org/10.1007/BF01649464