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New Zn1.5Co1.5B7O13Br boracite crystals were grown by chemical transportreactions in quartz ampoules, at a temperature of 1173 K. The crystal structurewas characterized by X-ray diffraction. The crystals present an orthorhombicstructure with space group Pca21, (No. 29). The determined cell parameterswere: a = 8.5705(3){\AA}, b = 8.5629(3) {\AA}, and c = 12.1198(4){\AA}, andcell volume, V = 889.45(5) {\AA}3 with Z = 4. Magnetic properties in singlecrystals of the new boracite, were determined. The Susceptibility-Temperature(X -T) behavior at different magnetic intensities was studied. The inverse ofthe magnetic susceptibility X-1(T) shows a Curie-Weiss characteristic with spins = 3/2 and a small orbital contribution, l. At low temperatures, below 10 K,X(T) shows irreversibility that is strongly dependent on the applied magneticfield. This boracite is ferrimagnetic up to a maximum temperature of about 16K, as shows the coercive field. The reduction of the irreversibility by theinfluence of the magnetic field, may be related to a metamagnetic phasetransition.

Crystal Structure and Magnetic Properties of the New Zn1.5Co1.5B7O13Br Boracite