Synthesis, Structure, and Luminescent Properties of the New Double Borate K3Eu3B4O12

Abstract

The study established the formation of the new double borate K₃Eu₃B₄O₁₂. The Rietveld refi nement of the crystal structure revealed that K₃Eu₃B₄O₁₂ crystallises in the monoclinic syngony with unit cell parameters a = 10.6727(7) Å, b = 8.9086(6) Å, c = 13.9684(9) Å, b = 110.388(2)° (space group P²/c). K₃Eu₃B₄O₁₂ has a layered structure with [Eu₈(BO₃)₈]∞ sheets which are almost parallel to the ab plane. These sheets are formed by pentagonal EuO₇ bipyramids, EuO₆ octahedras, and BO₃ triangles
attached to them through common vertices. Neighbouring layers are interconnected via pentagonal EuO₇ bipyramids, BO₃ triangles, and potassium cations. The luminescence spectrum demonstrates a noticeable emission band at 611 nm, resulting from the ⁵D₀→⁷F₂ transition of Eu³⁺ ions.

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