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The obtained powders were characterized using X\u2010ray diffraction (XRD), electron paramagnetic resonance (EPR), infrared (IR), absorption and luminescence spectra. X\u2010ray analysis showed that the compounds are pure solid solutions with orthorhombic symmetry at <jats:italic>x<\/jats:italic> values 0 and 0.5 and with monoclinic symmetry for <jats:italic>x<\/jats:italic> values 1.0, 1.5 and 2.0. The calculated crystallite size ranged from about 20\u00a0to 110\u00a0nm, except for Sc<jats:sub>2<\/jats:sub>(WO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub> characterized by considerably larger sizes. IR spectra of the solid solutions contain the characteristic vibrations of the WO<jats:sub>4<\/jats:sub> and MeO<jats:sub>6<\/jats:sub>, (Me\u00a0=\u00a0Sc, In) polyhedra, building the Sc<jats:sub>2<\/jats:sub>(WO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub> and In<jats:sub>2<\/jats:sub>(WO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub> structures. EPR analysis proved the presence of isolated Cr<jats:sup>3+<\/jats:sup> ions in the crystal field with rhombic symmetry. The presence of Cr<jats:sup>3+<\/jats:sup> in sites with weak and strong crystal field was revealed by absorption and luminescence spectra. This study demonstrates the effect of hosts crystal symmetry, particles size and doping concentration on the luminescence properties.<\/jats:p>","DOI":"10.1002\/bio.3534","type":"journal-article","created":{"date-parts":[[2018,8,8]],"date-time":"2018-08-08T22:59:32Z","timestamp":1533769172000},"page":"1185-1193","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Spectroscopic investigations of nanosized Cr<sup>3+<\/sup> doped Sc<sub>2\u2212<i>x<\/i><\/sub>In<sub><i>x<\/i><\/sub>(WO<sub>4<\/sub>)<sub>3<\/sub>: A new promising laser material"],"prefix":"10.1002","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1856-5806","authenticated-orcid":false,"given":"A.","family":"Yordanova","sequence":"first","affiliation":[{"name":"Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences  Acad. G. 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