Abstract
Solid solutions Li1−xNaxMgPO4 (0 ≤x ≤ 0.20) with olivine-type orthorhombic structure were synthesized by the conventional solid state reaction route and their optical properties and defect structure were examined by experimental and theoretical methods. A significant gain in the thermoluminescence of phosphate was found with an increase in sodium concentration up to 6%. The ab initio calculations and the study of the ESR spectra made it possible to attribute this effect to an increase in the number of defects, primarily oxygen vacancies. It was established that partial substitution of sodium for lithium can increase the solubility of rare earth elements in LiMgPO4, and this contributes to the development of materials with improved dosimetric characteristics.
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