Synthesis, Structure and Properties of Compounds Derived from Kotoite-related Structures: AMBO (A=Zn, Ba, Pb; B=Pb, Ba, Zn, Cu).

A series of compounds with the general formula AMBO (A=Zn, Ba, Pb; B=Pb, Ba, Zn, Cu) related to the kotoite structure has been prepared employing high-temperature solid state methods. The substitution of transition elements in place of Zn ions resulted in colored compounds. The optical absorption spectra could be explained based on Tanabe-Sugano diagram and allowed d-d transitions. Dielectric studies on BaZnBO, (BaPb)ZnBO, PbZnBO, PbZnBO, BaZnBO and PbCuBO at room temperature indicate reasonable values at low frequencies, which decrease on increasing frequencies. Magnetic study of synthesized single-phase compounds BaZnCoBO and PbCuBO have been performed. The substitution of Eu, Tb and Tm in place of Ba in BaZnBO, gives rise to the expected emission of red, green and blue colors. Suitable modifications of the different phosphors in BaZnBO, resulted in white-light emission in BaZnBO. The PbCuBO compound was found to be a good catalyst in the ipso-hydroxylation of arylboronic acids.