Synthesis and magnetic properties of copper metaborate single crystals, CuB2O4

Large high-quality single crystals of copper metaborate are grown on the ba sis of the phase diagram of the ternary Li2O-CuO-B2O3 system. Bright blue c rystals with a volume of about 1 cm(3) were grown by the method of spontane ous crystallization while slowly cooling the melt. The magnetic susceptibil ity and electron spin resonance were measured. It is shown that the effecti ve magnetic moment of a Cu2+ ion is equal to 1.6 mu(B) and the g-factor, to 2.170 and 2.133 for the magnetic field oriented parallel and perpendicular to the fourfold axis, respectively. At 21 and 10 K, sharp anomalies of mag netic susceptibility are observed. (C) 2000 MAIK "Nauka/Interperiodica".