Effect of Oxygen upon the Heat Capacity of Gadolinium between 1.3° and 5°K

Abstract

A specimen of gadolinium was oxygenated and the heat capacity measured at three levels of oxygen content. The broad low‐temperature anomaly reported by Kurti and Safrata was reproduced by the oxygenation. Entropy calculations show that the reported anomaly results from the magnetic ordering of the spin 7/2 Gd³⁺ ions of the Gd₂O₃ molecules.