Synthesis of a new complex borate KBaSm(BO3)2

A novel compound containing three cation alkali, alkali earth, rare earth orthoborate KBaSm(BO3)2 was synthesized by using two-step solid-state method. Results of powder X-ray diffraction analysis (XRD) and FTIR spectroscopy showed that this compound is isostructural with known compounds KBaY(BO3)2 [1] and KBaTbB2O6 [2] and refers to trigonal crystal system (R？m space group with unit cell parameters of crystalline lattice а=5,4845(10) ？, с=18,135(13), Z=3). KBaSm(BO3)2 was obtained at a temperature of 825°C from initial reactants: samarium (III) oxide, barium and potassium carbonates and boric acid. Among KBaSm(BO3)2 – KBaTb(BO3)2 – KBaY (BO3)2 observed a regular linear variation of unit cell parameters, as well as regular shift of the bands in the IR spectra, depending on the size of the rare earth cation.