HEAT-CAPACITY STUDY OF TI AND ZN-DOPED MAGNETITE

Heat capacities have been measured on single crystal specimens of magn etite containing low levels of Ti or Zn as a replacement for iron. A c hange in the nature of the Verwey transition from first to second or h igher order was observed with increasing doping levels. This is in str ict analogy with prior observations showing a similar change when the oxygen/iron ratio is increased beyond the 4/3 ratio. The entropy of th e Verwey transition diminishes with increasing concentration of dopant s.