This, most metal-rich, variant was prepared by reducing GaBr with Ga in sealed ampoules. The orthorhombic structure contained pairwise associated ecliptic anions, [Ga2Br6]2-, with metal-metal single bonds. The coordination polyhedra around the three Ga+ atoms were cubes and tricapped trigonal prisms of Br atoms. An unusual feature of the crystal structure was a vacancy in the Ga+ partial structure. This led to a Ga+ ion conductivity with an activation enthalpy of 0.8eV. The conductivity at 400K was equal to 1.5 x 10-5S/cm.

W.Hönle, G.Gerlach, W.Weppner, A.Simon: Journal of Solid State Chemistry, 1986, 61[2], 171-80