Solubility of indium in the gallides RENiGa₄ (RE=Y, Gd, Tb)

The solubility of indium in the gallides RE NiGa 4 (YNiAl 4 type structure, RE = Y, Gd, Tb) at 870 K and the unit cell parameters of the solid solutions were determined. The crystal structure of TbNiGa 3.17 In 0.83 (space group Cmcm , oS 24, a = 0.41529(2) nm, b = 1.55140(8) nm, c = 0.66136(4) nm, R 1 = 0.0162, w R 2 = 0.0280, 500 F 2 values, 25 variables) was refined from single crystal X-ray diffraction data. The TbNiGa 4– x In x samples were characterized for their magnetic properties. They were found to order antiferromagnetically below the Néel temperature T N = 20 K, independent of x spanning from 0 to 0.5.