期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 195, 期 2, 页码 468-474出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.200305950
关键词
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Specific optical rotations rho in c(Z)-direction were measured in single crystals of lanthanum gallium silicon oxide (langasite, La3GaGa3(GaSi)O-14, LGS), as well as its niobium (langanite, La-3(Ga1/2Nb1/2)Ga3Ga2O14, LGN) and tantalum (langataite, La-3(Ga1/2Ta1/2)Ga3Ga2O14, LGT) analogues, and strontium niobium gallium silicon oxide (Sr3NbGa3Si2O14, SNGS), all belonging to the calcium gallium germanate structure (Ca3Ga(GaGe2)Ge2O14, CGG). The crystals were grown from stoichiometric melts by conventional Czoch-ralski technique and the specific optical rotations obtained by a novel technique via measuring the optical transmission at various wavelengths between crossed polarisers. All compounds investigated show unusually large values of rho, in particular SNGS.
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