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The spectroscopic properties of the Eu3+ and Pr3+ ions in the weberite, Ca2La3Sb3O14 are examined in this paper. The Eu3+ is used as a structural probe ion to elucidate the local site symmetry of the La3+ ion in Ca2La3Sb3O14. The interpretation of the Eu3+ emission spectrum is not consistent with the C2h and S2 (Ci) point symmetry that are prescribed for the La3+ sites by the I2/m11 space group of...
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