The crystal structure of new quantum memory-storage material Sc1.368Y0.632SiO5
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Published:2019-08-05
Issue:9
Volume:75
Page:1202-1207
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ISSN:2053-2296
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Container-title:Acta Crystallographica Section C Structural Chemistry
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language:
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Short-container-title:Acta Crystallogr C
Author:
Iskhakova Liudmila D.,Ilyukhin Andrey B.,Kutovoi Sergey A.,Vlasov Victor I.,Zavartsev Yuri D.,Tarasov Valerii F.,Eremina Rushana M.
Abstract
Monoisotopic scandium yttrium oxyorthosilicate crystals as a material for quantum memory storage with high optical quality were grown by the Czochralski method. This material, of composition Sc1.368Y0.632SiO5, is characterized by congruent melting and a melting point 60 K below the temperature for the ideal solid-solution series Y2SiO5–Sc2SiO5. The structure of the crystals was refined on the basis of high-quality single-crystal X-ray diffraction data. Sc1.368Y0.632SiO5 belongs to B-type RE2SiO5 (space group C2/c). Scandium and yttrium cations are distributed among two 8f sites with coordination numbers 7 and 6 for which the occupancy parameters ratios Sc:Y and average bond lengths are, respectively, 0.473:0.527 and RE1—O = 2.305 (2) Å, and 0.895:0.105 and RE2—O = 2.143 (2) Å. It is shown that the character of the occupancy of the positions of the cations with coordination numbers (CN) 6 and 7 for these solid solutions can be approximated by a polynomial dependence, the magnitude of the coefficients of which depends on the difference in the ionic radii of the cations. A preliminary electron paramagnetic resonance (EPR) study shows that activator ions with a large ionic radius at a concentration less than 0.1% occupy a position with CN = 7.
Funder
Russian Science Foundation
Publisher
International Union of Crystallography (IUCr)
Subject
Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry,Condensed Matter Physics