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New silicate-germanates (K 2.9 Cs 0.1 )(Sc 0.7 In 0.3 )[(Si 2.95 Ge 0.05 )O 9 ]·H 2 O and (K 2.16 Cs 0.84 )Bi[(Si 0.5 Ge 0.5 ) 3 O 9 ]·H 2 O have been synthesized in multi-component systems under mild hydrothermal conditions. The new compounds are classified as new representatives of close related K 3 ScSi 3 O 9 ·H 2 O parent structure, sp. gr.  Pmn 2 1 . Their structural and isomorphic peculiarities are compared with it as well as with earlier investigated K 1.46 Pb 1.54 Сa[(Ge 0.23 Si 0.77 ) 3 O 9 ](ОН) 0.54 ·0.46Н 2 О. Together with other known compounds, silicate-germanates form the extensive family A 3 M[T 3 O 9 ]·H 2 O, A = K, Cs, Ca, Pb; M = Ho, Sc, Lu, Tb, Er, Y, Bi, Pb, In; T = Si, Ge, with a mixed microporous framework combined of M-octahedra and T-tetrahedra. Large alkali metal or/and Ca, Pb cations fill broad framework channels with cross-section up to 7.3 Å. Because of wide isomorphic substitution in the channels, and in tetrahedra and octahedra, ion exchange properties in the family are expected. Due to polar symmetry, all the crystals possess second-order nonlinearity which was confirmed with positive SHG tests for four compositions. Powder SHG experiments demonstrated moderate second harmonic intensities of order of α-quartz standard signals.

zeitschrift für kristallographie - crystalline materials

Microporous framework polar silicate-germanates with a wide isomorphic substitution: (K 2.9 Cs 0.1 )(Sc 0.7 In 0.3 )[(Si 2.95 Ge 0.05 )O 9 ]·H 2 O and (K 2.16 Cs 0.84 )Bi[(Si 1.5 Ge 1.5 )O 9 ]·H 2 O