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The mixed niobate-borate compound RbNbB 2 O 6 (RNB) and its isomorphs have been produced in single crystal form using the spontaneous nucleation and top seeded solution growth (TSSG) techniques. X-ray diffraction studies show that RNB, KNB and certain K + , Na + and Cs + substituted variations of the pure compounds have monoclinic symmetry with the P11n space...