X‐Ray Powder Diffraction Studies and Thermal Behavior of NaK₂B₉O₁₅, Na(Na_.17K_.83)₂B₉O₁₅, and (Na_.80K_.20)K₂B₉O₁₅.

Abstract

Structure D 2000 X-Ray Powder Diffraction Studies and Thermal Behavior of NaK 2 B 9 O 15 , Na(Na.17K.83)2B9O15, and (Na.80K.20)K2B9O15. -The title compounds are synthesized by glass crystallization from stoichiometric mixtures of H3BO3, Na2CO3, and K2CO3 (670°C, 20 h followed by 1000°C, 0.5-1 h). The compounds crystallize in the monoclinic space group P21/c with Z = 4 (powder XRD). Their crystal structure consists of a three-dimensional open framework built up from three crystallographically independent triborate groups. The thermal behavior of the compounds is characterized by high-temperature XRD. -(BUBNOVA, R.; ALBERT, B.; GEORGIEVSKAYA, M.; KRZHIZHANOVSKAYA, M.; HOFMANN, K.; FILATOV*, S.; J. Solid State Chem.