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The structurally related compounds with the empirical formulæ Li 11.2(1) Ba 2 Al 3.6(1) O 13  ( 1 ), Li 10.0(1) Ba 2 Al 4.0(1) O 13  ( 2 ), and Li 7.9(1) Ba 2 Al 4.7(1) O 13  ( 3 ) have been synthesized by conventional solid-state synthesis. The crystal structures were solved and refined in the trigonal space group  P 3‾ m 1 (no. 164) with the chemical compositions derived from single-crystal X-ray diffraction data. The lattice parameters have been refined to  a  = 6.0399(1) Å,  c  = 10.1264(4) Å,  V  = 319.92(2) Å 3  for  1 ,  a  = 6.0505(2) Å,  c  = 10.1272(4) Å,  V  = 321.07(2) Å 3  for  2 , and  a  = 6.0436(1) Å,  c  = 10.1762(3) Å,  V  = 321.89(2) Å 3  for  3 . A common structure with a three-dimensional tetrahedron substructure is constructed from (Li/Al)O 4  and AlO 4  tetrahedra, coined by edge-sharing T2 supertetrahedra and  sechser -rings. Upon blue-light excitation ( λ  exc  = 448 nm), broad-band emissions are observed for the Eu 2+ -activated compounds with a peak wavelength of  λ  em  ∼ 563 nm and a full width at half maximum of FWHM ∼ 141 nm (0.56 eV, 4,534 cm −1 ) for  1 ,  λ  em  ∼ 526 nm with a FWHM ∼ 98 nm (0.45 eV, 3,637 cm −1 ) for  2 , and  λ  em  ∼ 549 nm with a FWHM ∼ 151 nm (0.63 eV, 5,052 cm −1 ) for  3 .

zeitschrift für naturforschung b

Edge-sharing T2 supertetrahedra in Li 11.2(1) Ba 2 Al 3.6(1) O 13 , Li 10.0(1) Ba 2 Al 4.0(1) O 13 , and Li 7.9(1) Ba 2 Al 4.7(1) O 13  – syntheses, crystal structures, luminescence of Eu(II)-activated materials