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Two new penta-borates, tris-odium zinc cadmium penta-borate, Na 3 Zn 0.912 Cd 0.088 B 5 O 10 , and tris-odium zinc magnesium penta-borate, Na 3 Zn 0.845 Mg 0.155 B 5 O 10 , have been synthesized by high-temperature solution reactions at 1023 K. Their crystal structures were determined by single-crystal X-ray diffraction. Both solid solutions crystallize in the ortho-rhom-bic form of the parent compound Na 3 ZnB 5 O 10 (space group type Pbca , Z = 8) and contain the double ring [B 5 O 10 ] 5- anion composed of one BO 4 tetra-hedron and four BO 3 triangles as the basic structural motif. The anions are bridged by tetra-hedrally coordinated and occupationally disordered M  2+ ( M = Zn/Cd, Zn/Mg) cations via common O atoms to form [ M B 5 O 10 ]  n   3 n - layers. The intra-layer inter-secting channels and the inter-layer voids are occupied by Na + cations to balance the charge.

acta crystallographica. section e, crystallographic communications

Crystal structures of the solid solutions Na3Zn0.912Cd0.088B5O10and Na3Zn0.845Mg0.155B5O10