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Balamurugan, Sarkarainadar
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article
The Solid Solution Lu<sub>2–x</sub>Sc<sub>x</sub>SiO<sub>5</sub>
Abstract
<jats:p>The monoclinic silicates Lu<jats:sub>2</jats:sub>SiO<jats:sub>5</jats:sub> and Sc<jats:sub>2</jats:sub>SiO<jats:sub>5</jats:sub> (Y<jats:sub>2</jats:sub>SiO<jats:sub>5</jats:sub> type, space groupC2/c) forma solid solution Lu<jats:sub>2−x</jats:sub>Sc<jats:sub>x</jats:sub>SiO<jats:sub>5</jats:sub>. Samples with x = 0.5, 0.8, 1.0 were synthesized ceramically from Lu<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, Sc<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, and SiO<jats:sub>2</jats:sub>. The structures of three crystals with x = 0.88, 0.77, and 0.50 were refined on the basis of single-crystal X-ray diffraction data. The rare earth (RE) atoms occupy two crystallographically different 8ƒ sites with oxygen coordination numbers (CN) of 6 (RE2) and 7 (RE1). Refinements of the occupancy parameters showed Lu/Sc mixing for both sites with a strong preference of the smaller scandium atoms for CN6</jats:p>