- Therareearthionsliebetweenthedisilicategroupsandthesheetsofoctahedratoform(8+3)-coordinatedA(1)-polyhedraand10-coordinatedA(2)-polyhedra.ItwasestimatedthatMn~(2+)ionssituatedinBisitesofoxygenoctahedra,ThedecreaseofEPRsignalintensityofMnionmeansthecha...
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