Synthesis, crystal structure and properties of a new congruently melting compound, K3ZnB5O10

A new compound, K3ZnB5O10, has been synthesized by solid-state reaction. It crystallizes in the monoclinic system, space group P21/n with unit–cell parameters a = 7.6391(5) Å, b = 19.2304(13) Å, c = 7.6905(5) Å, β = 116.698(4)° and Z = 4. The structure of the compound is solved by the direct methods and refined to R1 = 0.0286 and wR2 = 0.0600. K3ZnB5O10 contains a two-dimensional ZnB5O10 layer, which forms by connecting isolated double ring [B5O10] groups and ZnO4 tetrahedra. The K atoms filling in the interlayer and intralayer link the layers together. Functional groups presented in the sample were identified by FTIR spectrum. UV–vis–NIR diffuse reflectance spectrum exhibits ultraviolet cutoff edge is about 190 nm. The DSC analysis proves that K3ZnB5O10 is a congruently melting compound.

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