Ceric borate, CeO₂.B₂O₃

Ceric borate, CeO₂.B₂O₃, may be prepared, according to Holm, by heating ceria with an excess of boric anhydride in a petroleum injector-furnace and extracting the mass with water; it is described as a yellow powder, insoluble in water and dilute mineral acids. Guertler, however, states that this method of preparation only yields cerous metaborate, Ce(BO₂)₃.