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A lot of attention has been paid recently to the non-centrosymmetric fluoride borates with chemical formula BaMBO3F (M = Ca, Mg, Zn). A new BaSrBO3F phase has been synthesized by the solid-state reaction, and single crystals have been grown in the BaSrBO3F–NaF system. According to the X-ray single-crystal structure analysis, the compound crystallizes in the space group P63 mc. The distinguished feature of the determined structure is the simultaneous cationic (Ba2+ ↔ Sr2+) and anionic (3F)3– ↔ (BO3)3– isomorphisms, implying the existence of the solid-solution series Ba4–x Sr3+x (BO3)4–y F2+3y . The Ba4Sr3(BO3)4F2 and Ba3Sr4(BO3)4F2 end-members have been synthesized by solid-state reaction. The existence of Ba4Sr3(BO3)3F5 and Ba3Sr4(BO3)3F5 end-members has not been confirmed.

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NaSrR(BO 3 ) 2 (R = Ho−Lu, Y, Sc) compounds were obtained for the first time. Their structures exhibit disordered positions of Sr 2+ and Na + atoms while RO 6 polyhedra are connected through the BO 3 groups. Large distances between R atoms and high transparency in the range of 250−900 nm make them promising for phosphor applications. A pathway to obtain single crystals was shown by growing NaSrY(BO 3 ) 2 and NaSrYb-(BO 3 ) 2 by the top seeded solution growth method with Na 2 O-B 2 O 3 -NaF flux.

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